JP3076157B2 - Plug-in power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply module of a power supply module connected to a printed wiring board connector of a printed wiring board. In particular, regarding a plug-in power supply for supplying
The present invention relates to a plug-in power supply device that can supply a power supply voltage that is incompatible with a load due to erroneous mounting to prevent breakage or damage of a load or a connector.

[0002]

2. Description of the Related Art Conventionally, a power supply circuit of a power supply module is connected to a printed wiring board connector of a printed wiring board to supply a power supply voltage from a power supply circuit of the power supply module to a load via the printed wiring board. When a power-on instruction is given by connecting a power supply module connector to a printed wiring board connector, a predetermined voltage is supplied from a power supply circuit of the power supply module to a load via the printed wiring board. It has become.

[0003]

As described above, the power supply module of the conventional plug-in power supply supplies a power supply voltage only by receiving a power-on instruction. Therefore, for example, when the load is a TTL-IC and the supply voltage is +5 volts, if the power supply module that supplies the power supply voltage of +24 volts is erroneously connected and the power-on instruction is given, the TTL-IC In this case, a voltage of +24 volts is applied to the power supply module, so that the TTL-IC is broken, and furthermore, the power supply module connector, the printed wiring board connector, or the wiring pattern of the printed wiring board is damaged, damaged or deteriorated. Have.

In addition, when a load is a motor driven at +24 volts, if a power supply module for supplying a power supply voltage of +5 volts is erroneously connected to give a power-on instruction, the motor cannot be driven. I do.

[0005]

A plug-in power supply device according to the present invention includes a power supply circuit for outputting a power supply voltage, an output voltage of the power supply circuit being detected, the output voltage being equal to or less than a specified value, and an undervoltage being detected. A plurality of types of power supply modules including an undervoltage detection circuit that outputs an abnormal signal when an inhibit signal or an inhibit control signal for inhibiting detection is not input, and a power supply module connector; a power-on signal; A power supply control module for outputting an inhibit signal or the inhibit signal control signal, a printed wiring board connector connected to the power supply module connector, and a load, and the printed wiring connecting the inhibit signal or the inhibit signal control signal; The position of the contact of the board connector corresponds to the type of the power supply module And a plurality of kinds of printed circuit boards was e,
And the power supply module connector and the printed wiring
If the board connector is connected in the correct state,
From the power supply control module to the undervoltage detection circuit,
Error signal from the undervoltage detection circuit
When no signal is output, the power-on signal is
Power supply circuit supplies voltage to the load
The power supply module connector and the
If it is connected to the printed circuit board connector by mistake,
From the power supply control module to the undervoltage detection circuit.
The undervoltage detection circuit without supplying the inhibit signal
When the power-on signal is
The power supply circuit supplies a voltage to the load even when the power is supplied to the power supply circuit.
Is not supplied . The plug-in power supply device is further characterized in that the display circuit for performing alarm display by the abnormal signal outputted from the undervoltage detecting circuit provided in the power supply module.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a state where an incorrect power supply module is connected in the embodiment of FIG.

In FIG. 1, the power supply module 11
A power supply module that supplies a power supply voltage of 5 volts,
It has a power supply circuit 21 that outputs a voltage of +5 volts, an undervoltage detection circuit 31 that outputs an abnormal signal 31A, and a power supply module connector (connector) 41. The positive terminal 21a and the negative terminal 21b of the power supply circuit 21 are coupled to the terminals 41a and 41b of the connector 41 and the input terminals 31a and 31b of the undervoltage detection circuit 31, respectively. The input terminal 21c of the power supply circuit 21 is connected to the connector 4
1 terminal 41c and the printed wiring board 51
A power-on signal 81A is input from the power supply control module 81 of FIG. Further, a terminal 41 e of the connector 41 is coupled to an input terminal 31 c of the undervoltage detection circuit 31. The terminal 41d of the connector 41 is an empty terminal. The undervoltage detection circuit 31 operates abnormally when the voltage between the input terminals 31a and 31b is equal to or less than a specified value and the inhibit signal 81B is not input from the power supply control module 81 of the printed wiring board 51 via the input terminal 31c. Signal 31
A is output to the power supply circuit 21. The power supply circuit 21
When the power-on signal 81A is input when the abnormal signal 31A is not input, the power supply voltage of +5 volts is applied to the + terminal 2
1a and output between the -terminal 21b.

The power supply module 21 supplies a power supply voltage of +24 volts, and includes a power supply circuit 22 for outputting a voltage of +24 volts, an undervoltage detection circuit 32 for outputting an abnormal signal 32A, and a power supply module connector ( Connector 42). + Of the power supply circuit 22
The terminal 22a and the negative terminal 22b are connected to the connector 4 respectively.
2 terminals 42a and 42b and undervoltage detection circuit 3
2 input terminals 32a and 32b. The input terminal 22c of the power supply circuit 22 is connected to the terminal 4 of the connector 42.
2c, and receives a power-on signal 21A from a power control module 81 of the printed wiring board 51. The terminal 41 d of the connector 42 is connected to the undervoltage detection circuit 3.
2 input terminal 32c. The terminal 42e of the connector 42 is an empty terminal. The undervoltage detection circuit 32 detects an abnormal state when the voltage between the input terminals 32a and 32b is equal to or lower than a specified value and the inhibit signal 81B is not input from the power supply control module 81 of the printed wiring board 51 via the input terminal 32c. The signal 32A is output to the power supply circuit 22. The power supply circuit 22 outputs the abnormal signal 3
When the power-on signal 81A is input when 2A is not input, a power supply voltage of +25 volts is output between the + terminal 22a and the − terminal 22b.

The printed wiring board 51 has two printed wiring board connectors (connectors) 61 and 62 and a power supply control module 81. Terminal 6 of connector 61
A TTL load 71 is connected to 1a and 61b. The terminals 61c and 61e are connected to the output terminals 81a and 81b of the power supply control module 81, respectively, and input the power-on signal 81A and the inhibit signal 81B, respectively. The terminal 61d is an empty terminal. On the other hand, a motor load 72 is connected to the terminals 62a and 62b of the connector 62. Also,
The terminals 62c and 62d are connected to the output terminals 81a and 81b of the power supply control module 81, and receive the power-on signal 81A and the inhibit signal 81B, respectively. The terminal 61e is an empty terminal.

Next, the operation of the plug-in power supply device configured as described above will be described.

In FIG. 1, when the connector 41 of the power supply module 11 and the connector 42 of the power supply module 12 are connected to the connectors 61 and 62 of the printed wiring board 51, respectively, the power supply modules 11 and 12 are connected in a correct state. The inhibit signal 81B is input from the power supply control module 81 of the printed wiring board 51 to the undervoltage detection circuit 31 of the power supply module 11 and the undervoltage detection circuit 32 of the power supply module 12. Therefore, the undervoltage detection circuit 31 and the undervoltage detection circuit 3
2 does not output the abnormal signals 31A and 32A, respectively. Therefore, when the power-on signal 81A is output from the power supply control module 81 in this state, the power supply module 11
Power supply circuit 21 outputs a voltage of +5 volts and
Supply to the load 71. On the other hand, the power supply circuit 22 of the power supply module 12 outputs a voltage of +24 volts to output the motor load 7.
Feed to 2. As a result, both the TTL load 71 and the motor load 72 operate normally.

When the power supply module is erroneously connected, for example, when the connector 42 of the power supply module 12 is connected to the connector 61 of the printed wiring board 51 as shown in FIG. Since the signal 81B is not input to the undervoltage detection circuit 32 of the upper power supply module 12, the undervoltage detection circuit 32 of the upper power supply module 12 outputs an abnormal signal 32A. Therefore, even if the power-on signal 81A is output from the power supply control module 81 in this state, the power supply circuit 22 of the upper power supply module 12 does not output a voltage.
No voltage is supplied to the L load 71. Therefore TTL
The destruction of the load 71 can be prevented, and the connector 42 of the upper power supply module 12, the connector 61 of the printed wiring board 51, and the wiring pattern of the printed wiring board 51 can be prevented from being damaged, damaged, or deteriorated.

FIG. 3 is a block diagram showing a second embodiment of the present invention, in which an incorrect power supply module is connected.

In FIG. 3, the power supply module 13
The power supply module supplies a power supply voltage of 24 volts, and includes a power supply circuit 23 that outputs a voltage of +24 volts, an undervoltage detection circuit 33 that outputs an abnormal signal 33A, and a power supply module connector (connector) 43. I have.
The positive terminal 23a and the negative terminal 23b of the power supply circuit 23 are coupled to the terminals 43a and 43b of the connector 43 and the input terminals 33a and 33b of the undervoltage detection circuit 33, respectively. An input terminal 23c of the power supply circuit 23 is coupled to a terminal 41c of the connector 43, and receives a power-on signal 81 from a power supply control module 81 of the printed wiring board 52.
Enter A. The terminals 43d and 43f of the connector 43 are respectively coupled to the input terminals 10a and 10b of the OR gate 10, and the output terminal 10c of the OR gate 10 is coupled to the input terminal 33c of the undervoltage detection circuit 33. A resistor 9 is coupled to the input terminal 10b of the OR gate 10. Terminal 4 of connector 43
Reference numeral 3e denotes a terminal for connecting to the ground wire 52a of the printed wiring board 52 when the power supply module is a power supply module for supplying a power supply voltage of +5 volts, and is currently an empty terminal. The undervoltage detection circuit 33 detects an abnormal state when the voltage between the input terminals 33a and 33b is equal to or less than a specified value and the inhibit signal 81B is not input from the power supply control module 81 of the printed wiring board 52 via the input terminal 33c. The signal 33A is output to the power supply circuit 23. The power supply circuit 23 outputs a power supply voltage of +24 volts between the + terminal 23a and the − terminal 23b when the power supply signal 81A is input when the abnormal signal 33A is not input.

The printed wiring board 52 has two printed wiring board connectors (connectors) 63 and 64 and a power supply control module 81. Terminal 6 of connector 63
A TTL load 71 is connected to 3a and 63b. The terminals 63c and 63d are connected to the output terminals 81a and 81b of the power control module 81, respectively, and receive the power-on signal 81A and the inhibit signal 81B, respectively. The terminal 61e is grounded by a ground line 52a. The terminal 61f is an empty terminal. On the other hand, the motor load 72 is connected to the terminals 64a and 64b of the connector 64. Also,
The terminals 64c and 42d are connected to the output terminals 81a and 81b of the power supply control module 81, and receive the power-on signal 81A and the inhibit signal 81B, respectively. The terminal 61e is an empty terminal. The terminal 61f is grounded by a ground line 52b.

In the plug-in power supply device configured as described above, the connector 63 of the power supply module 13 for supplying the power supply voltage of +24 V is connected to the connector 63 to which the power supply module for supplying the power supply voltage of +5 V is connected. If the connection is made erroneously, even if the inhibit signal 81B from the power supply control module 81 is input to one input terminal 10a of the OR gate 10 of the upper power supply module 13, the resistor 9 is connected to the other input terminal 10b of the OR gate 10.
, A high-level signal is input to the input terminal 33 c of the undervoltage detection circuit 33.
B is not input, and the undervoltage detection circuit 33 outputs an abnormal signal 33A. As described above, whether or not to use the inhibit signal 81B can be controlled by the signal input to the other input terminal 10b of the OR gate 10. Therefore, even when the power supply control module 81 outputs the power-on signal 81A in this state. Since the power supply circuit 23 of the upper power supply module 13 does not output a voltage, the TTL load 71
No voltage is supplied to

FIG. 4 is a block diagram showing a third embodiment of the present invention, in which an incorrect power supply module is connected.

The embodiment shown in FIG. 4 is obtained by adding a display circuit for displaying an abnormality based on an abnormality signal output from the undervoltage detection circuit to the power supply module of the embodiment shown in FIG.

In FIG. 4, the display circuit 8 provided in the power supply module 14 receives an abnormal signal 34 A from the undervoltage detection circuit 34 and is connected to a terminal 44 f of a connector 44. On the other hand, the connectors 65 and 66 of the printed wiring board 53 have terminals 65f and 66f corresponding to the terminals 44f, respectively.
f and 66f are connected to the power control module 82. The configuration and operation of the other parts are the same as those of the embodiment shown in FIGS.

In the plug-in power supply device configured as described above, the connector 65 of the power supply module 14 that supplies the power supply voltage of +24 volts is connected to the connector 65 to which the power supply module that originally supplies the power supply voltage of +5 volts is connected.
4 is incorrectly connected, the undervoltage detection circuit 34 of the upper power supply module 14 does not input the inhibit signal 82B from the power supply control module 82, so the abnormal signal 34
A is output. The display circuit 8 inputs the abnormality signal 34A and performs an abnormality display. At this time, the abnormal signal 34A is
Terminal 44f of connector 44 and terminal 6 of connector 65
The power supply control module 82 stops outputting the power-on signal 82A because it is also input to the power supply control module 82 via 5f. Therefore, the two power supply modules 14
Neither does a +24 volt power supply voltage. in this way,
Displaying the abnormal state by the display circuit 8 makes it easy to identify a power supply module that is incorrectly connected.

[0022]

As described above, the plug-in power supply device of the present invention provides an undervoltage detection circuit for detecting an output voltage of a power supply circuit when a power supply module having a different supply voltage is erroneously connected to a printed wiring board. By preventing an inhibit signal from being input and outputting an abnormal signal, and by not supplying a voltage from the power supply circuit of the power supply module,
This has the effect of preventing damage to the load and preventing damage, damage or deterioration of the connector of the power supply module, the connector of the printed wiring board, and the wiring pattern of the printed wiring board.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a block diagram showing a state where an incorrect power supply module is connected in the embodiment of FIG. 1;

FIG. 3 is a block diagram showing a second embodiment of the present invention.

FIG. 4 is a block diagram showing a third embodiment of the present invention.

[Explanation of symbols]

8 Display circuit 9 Resistor 10 OR gate 11.12.13.14 Power supply module 21.22.23.24 Power supply circuit 31.32.33.34 Undervoltage detection circuit 31A.32A.33A.34A Abnormal signal 41.42. 43/44 Power supply module connector (connector) 51/52/53 Printed wiring board 61/62/63/64/65/66 Printed wiring board connector (connector) 71 TTL load 72 Motor load 81/82 Power supply control module 81A / 82A Power-on signal 81B / 82B Inhibit signal

Claims (2)

(57) [Claims] A power supply circuit for outputting a power supply voltage; and an inhibit signal or an inhibit control signal for detecting an output voltage of the power supply circuit, the output voltage being equal to or lower than a specified value, and prohibiting detection of an undervoltage. An undervoltage detection circuit that outputs an abnormal signal when it is not, a plurality of types of power modules having a power module connector, a power control module that outputs a power-on signal and the inhibit signal or the inhibit signal control signal, A printed wiring board connector connected to a power supply module connector, and a load, wherein the position of the contact of the printed wiring board connector for connecting the inhibit signal or the inhibit signal control signal is changed according to the type of the power supply module. and a plurality of types of the printed wiring board was, and the collector Source module connector and said printed wiring
If the board connector is connected in the correct state,
From the power supply control module to the undervoltage detection circuit,
Error signal from the undervoltage detection circuit
When no signal is output, the power-on signal is
Power supply circuit supplies voltage to the load
The power supply module connector and the printed wiring board connector.
If the power supply module is incorrectly connected to the
The undervoltage detection circuit without supplying the inhibit signal
When the power-on signal is
The power supply circuit supplies a voltage to the load even when the power is supplied to the power supply circuit.
The plug-in power supply device is configured not to supply the power. 2. A plug-in power supply device according to claim 1, wherein the display circuit for performing alarm display by the abnormal signal outputted from the undervoltage detecting circuit provided in the power supply module.