JPH0664110B2 - Power supply test equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a test apparatus for a power supply device in which an electronic load is attached to a conveyor.

[Prior art]

The test is usually performed by connecting an electronic load that consumes the same power as the actual load to the output end of the power supply device.

As shown in the front view of FIG. 10, such an electronic load is formed by combining a plurality of electronic loads 1 into one electronic load device 2, and a power supply device 3 such as a DC power source is connected to the device 2. And test. Reference numeral 4 denotes a shelf of the device 2, and the power supply device 3 is placed on the shelf 4 and connected to each electronic load 1.
Reference numeral 6 is a knob for selecting the resistance value of the electronic load 1 and setting the load current.

However, since a large number of electronic loads 1 are collectively fixed in the vertical direction in such a device 2 and the shape thereof is large, the assembled power source device 3 is moved from the assembly line to the carriage 5.
It is necessary to carry it to the vicinity of the device 2 with and lift it up or down to the shelf 4 as shown by the arrow. Since the power supply device on the line is assembled while moving horizontally on the conveyor in each assembling stage, the structure of the device 2 that requires the power supply device to be moved by the dolly 5 or moved up and down can be installed in the assembly line. Hard to fit.

In addition, setting the load current with the knob 6 of the electronic load 1 every time the power supply device 3 is connected is troublesome. In particular, it is very troublesome in the case of a multi-channel power supply device capable of obtaining a plurality of outputs.

〔Task〕

The problem of the present invention is that it is possible to perform a test using an electronic load while moving on a conveyor like a general assembly line, and the setting of the load current does not touch the electronic load. The purpose of the present invention is to provide a test apparatus for a power supply device that can be performed in.

[Means for Solving the Problems]

The test apparatus of the power supply device according to the present invention has a load current setting device having a transmitting means arranged near the conveyor, and a receiving device for receiving a signal from the load current setting device, and each of the power supply devices according to the signal. An electronic load unit having an electronic load control circuit for setting a load current for each channel, and an electronic load unit and a pallet that is moved by a conveyor to mount a power supply device to be tested connected to the electronic load unit, Signal transmission / reception between the load current setting device and the electronic load control circuit is performed in a contactless manner by a signal transmission medium that propagates in the air. Specifically, transmission / reception of a signal between the load current setting device and the electronic load control circuit. Is performed by an optical signal, for example.

〔Example〕

1 to 9 showing an embodiment of the test apparatus of the present invention.
Description will be made with reference to the drawings. FIG. 1 is a plan view of a pallet on a conveyor, FIGS. 2, 3, and 4 are plan views, front views, right side views, and FIG. 6 of an electronic load device, respectively. It is explanatory drawing of the whole plane and a front, and it demonstrates from a mechanical structure first.

The entire test apparatus of the present invention is configured so that the pallet 11 is moved by the belt-shaped conveyor 10 as shown in FIGS. 5 and 6. The movement of the pallet 11 may be either a free flow type in which the conveyor 10 and the pallet 11 are fixed and separated freely, or a slad type in which the pallet 11 is fixed to the conveyor 10.

12 is a temperature bath through which the conveyor 10 passes, and the conveyor 10
The temperature load test can be performed above.

Between the two conveyors 10, there is a power supply line 13 for obtaining AC power as shown in FIG. 1, and by contacting the power collection line provided under the pallet 11 with the power supply line 13,
AC power of 100V and 200V is supplied on the pallet 11.

An electronic load unit 15 and a DC power supply device are placed on the pallet 11.
Two 16s are mounted and fixed, respectively. This power supply
16 can obtain outputs of three channels, and the electronic load unit 15 is configured by collecting three electronic loads 14 as one set in order to test the power supply device 16.

The electronic load unit 15 is, as shown in FIGS. 2 to 4,
The electronic load 14 is fixed on a heat sink 18 having a large number of fins 17, and a metal case 20 provided with a fan 19 for cooling the heat sink 18 is covered. The circuit board 21 fixed to one side surface is provided with an electronic load control circuit 22, a 100V outlet 23, a 200V outlet 24, and an outlet 25 to which a DC output of the power supply device 16 is connected.

The AC power obtained from the power supply line 13 is supplied from the outlet 23 and the outlet 24, and by connecting the input side of the power supply device 16, 100 V or 200 V AC input can be selected and supplied to the power supply device 16. Outlet 25 has a power supply
16 output terminals for 3 channels are connected.

The electronic load control circuit 22 is a built-in base of the conveyor 10.
By the optical signal from the load current setting device 29 attached to the side of 28, the three electronic loads 14 connected to the output terminals of the power supply device 16
Set the load current flowing to the. Two load current setting devices 29 are additionally provided, and each load current setting device 29 sets the load current of one power supply device 16.

In addition, the power line 13 starts from the vicinity of the load current setting device 29
It is provided along the conveyor 10 to the interior of 12, but is not present at the location where the power supply 16 was removed from the electronic load unit 15 after being tested through the temperature bath 12. This is a pallet at the conveyor 10 position where the power supply 16 is tested.
The power supply 16 and electronic load unit 15 on the 11 are automatically turned on, and when the test is completed and only the electronic load unit 15 is on the pallet 11, the power is automatically turned off.
It is something that is done.

As an input power source of the electronic load 14, an AC power source is supplied from the power source line 13 to the electronic load control circuit 22 and converted into DC power for use. Further, in FIG. 1, 26 and 27 are power supply devices.
There are 16 input and output lines.

Next, the electronic load control circuit 22 and the load current setting device 29 will be described with reference to FIGS. 7 to 9. 7 is an explanatory diagram showing the relationship between the load current setting device 29 and the electronic load control circuit 22, FIG. 8 is a block diagram of the load current setting device 29, and FIG. 9 is a block diagram of the electronic load control circuit 22.

The operation and relationship between the electronic load control circuit 22 and the load current setting device 29 are conceptually shown in FIG.

In the load current setting device 29, the load currents from 1 channel to 3 channels of the power supply device 16 are set for each channel by using the digital switches 31, 32 and 33 which constitute the switch section. This current value data is sent to the transmission circuits 41, 42, 43 for each channel, and is sent to the electronic load control circuit 22 as an infrared light signal.

The current value data for each channel received by the receiving circuits 51, 52, 53 is sent to the switch circuits 61, 62, 63 via the latch circuits 81, 82, 83 and connected to each channel of the power supply device 16. By selecting the resistance of the electronic loads 141, 142, 143, the load current value for each channel flowing in each electronic load is set.

Data transmission from the load current setting device 29 to the electronic load control circuit 22 on the moving pallet 11 is performed in a state where the electronic load unit 15 faces the load current setting device 29 at a fixed position and the conveyor 10 is stopped. . The electronic load control circuit 22 notifies the load current setter 29 of the arrival at the fixed position by the start signal, and the transmission of the current value data is started. Since the data transmission in the load current setting device 29 and the electronic load control circuit 22 is performed digitally, a control signal such as a clock signal is also transmitted together with the data signal.

In addition, although the electronic load is attached with the reference numeral 14 in FIGS. 1 to 3, the reference numeral is attached to FIGS. 7 to 9 for convenience of explanation.
The three electronic loads are shown separately by adding 141, 142, and 143.

Next, more detailed configurations and operations of the load current setting device 29 and the electronic load control circuit 22 will be described with reference to FIGS. 8 and 9.

The load current setting device 29 includes three digital switches 3 for setting the load current for each channel of the power supply device 16.
There are 1, 32, 33.

The current value data from the digital switches 31, 32, 33 becomes a parallel BCD code, and the shift registers 71, 72, 7
Entered in 3.

Each code in the example can be coded from 0.1A to 8.0A, for example, BCD code when setting a current value of 5.0A is 1.0A, 2.0A, 4.0A, 8.0A code is "1010". Becomes

When an optical signal indicating that the electronic load unit 15 on the pallet 11 has come to the fixed position enters the receiving circuit 55, the latch circuit 84
Produces an output and sets the counter 90. The counter 90 counts the output of the oscillation circuit 91 and, after a predetermined time has elapsed, causes the control signal generation circuit 92 to generate the clock signal SC and the busy signal SB.

During this predetermined time, the electronic load unit 15 on the pallet 11 is
Is the time until it stops stably at a fixed position without vibration or the like, which is about 3 seconds.

The clock signal SC and the busy signal SB are transmitted from the transmission circuit 44 to the electronic load control circuit 22 as optical signals, but at the same time, the clock terminals CK and the busy terminals of the three shift registers 71, 72, 73 of the load current setting device 29. Added to B.

By adding the busy signal SB, the shift register
71, 72 and 73 are transmission circuits 41 and 4 which output current value data as serial BCD codes in synchronization with the clock signal SC from the output terminal Q.
Send to 2, 43. Then, the transmission circuits 41, 42 and 43 transmit this data to the electronic load control circuit 22 as optical signals.

In the load current setting device 29, the setting of the load current to the transmission is thus performed for each channel of the power supply device 16.

Reference numeral 93 is an indicator that informs the operator that the current value data is being transmitted. While the busy signal SB is present, a sound is generated and the light is turned on.

Further, 94 is a power supply circuit of the load current setting device 29, V is a high-potential-side DC power supply line, and G is a low-potential-side power supply line.

The electronic load control circuit 22 of FIG. 9 includes a transmission circuit 45 that generates an optical signal indicating that the home position has been reached.

The terminal of the actual transmission circuit 45 is an infrared light emitting diode, and when the electronic load unit 15 fixed on the pallet 11 approaches a fixed position, the power of the electronic load unit 15 is automatically turned on, and the light emitting diode is It emits light. The load current setting unit 29 located at a position facing the light emitting diode at a fixed position starts data transmission when the light receiving diode of the terminal of the receiving circuit 55 of itself detects this light as a start signal.

The electronic load control circuit 22 receives the clock signal SC and the busy signal SB by the control signal receiving circuit 54 and sends them to the buffer circuit 104. The buffer circuit 104 generates floating clock signals SC1 to SC3 and busy signals SB1 to SB3.
Then, the latch circuit 81 for each channel of the power supply device 16,
A set of clock signal and busy signal are sent to the clock terminals CK and busy terminals B of 82 and 83.

The transmitter circuits 41, 42, 43 receive the serial BCD code signals indicating the current value data for each channel, and pass through the buffer circuits 101, 102, 103, the latch circuits 81, 82, 83.
Of the data terminal D.

The terminals of the transmission circuits 41, 42, 43 are also light-receiving diodes, and the transmission circuits 41, 42, which are located at opposite positions of the load current setting device 29.
The optical signal of the light emitting diode of the terminal of 43 is received. In addition,
These light-emitting diodes and light-receiving diodes of the electronic load control circuit 22 are shown in FIGS. 1 to 4 as being fixed to the case 20 with the reference numeral 95.

Here, when the transmission of the data from the load current setting unit 29 ends and the busy signal SB disappears, the latch circuits 81, 82, 83 are switched from the serial input mode to the parallel output mode and are switched to the switch circuits 61, 62, 63. Outputs parallel BCD code of current value data.

Each switch circuit 61, 62, 63 has 1 to 3 depending on the BCD code.
The resistors connected to the electronic loads 141, 142, 143 for the channels are selected in an analog manner, and the load currents when the respective channel outputs of the power supply device 16 are connected to the electronic loads 141, 142, 143 are set.

Power lines V1, G1, power lines V2, C2, which are respectively floated from the power circuit 96, are connected to the electronic loads 141, 142, 143.
Power lines V3 and G3 are connected.

While the pallet 11 is stopped, the worker connects the power supply device 16 to the electronic load unit 15. Ie outlet
The input side of the power supply device 16 is connected to 23 or the outlet 24, and each channel output of the power supply device 16 is connected to the electronic loads 141, 142, and 143. From the load current setting device 29 to the electronic load control circuit 22
Since it takes a few seconds to send data to the pallet, press the button switch etc. when the worker's connection work is completed.
When the movement of 11 is started, the test of the power supply device 16 is started.

In the test apparatus of the embodiment, the electronic load unit 15 is configured with three electronic loads as one set according to the number of channels of the power supply device 16, and the load current setter 29 and the electronic load control circuit are further provided.
22 is also configured to set the load current for three channels, but if the number of channels is one, it is possible to provide only one electronic load and set the load current for one channel. Good. Further, the circuit board 21 constituting the electronic load control circuit 22 can be arranged on the upper surface. In this way, various modifications can be made to the configuration of the entire electronic load unit.

Further, in the embodiment, the load current setter 29 and the electronic load control circuit
22 has a transmission circuit and a reception circuit for each channel, but a circuit for coding the channel is provided after the transmission circuit of the load current setting device, and the data is read by the code after the reception circuit of the electronic load control circuit. If a circuit for distributing to each channel is provided, the transmitting circuit and the receiving circuit can be shared by all channels. If the control signal is also coded separately, transmission and reception of the control signal can be included. This kind of configuration is for remote control of commercially available TVs and videos.
This can be achieved relatively easily by using an IC.

Further, although an optical signal is transmitted and received between the load current setting device and the electronic load control circuit, ultrasonic waves or radio waves may be used.

Although the conveyor 10 of the embodiment is combined with the movement in the horizontal direction and the movement in the vertical direction, it goes without saying that the test apparatus can be configured by moving only in the horizontal direction.

Further, although the load current setting device 29 of the embodiment is fixed to the base 28, it may be fixed at a position apart from the base 28.

Further, the electronic load unit may be configured such that the electronic load is directly fixed to the pallet 11 and the pallet 11 also serves as a heat dissipation plate.

〔effect〕

As described above, the test apparatus of the present invention is designed so that an electronic load and a power supply device can be placed on a pallet that is moved by a conveyor to perform a test.

In addition, the load current can be set by a signal from the vicinity of the conveyor, for example, an optical signal, without touching the electronic load. Therefore, once the load current is set by the load current setting device, the electronic load unit is automatically set sequentially when the pallet moved by the conveyor comes to the fixed position, and the power supply device is connected to the electronic load unit each time. It is not necessary to set the load current with the volume. Further, if the load current setting device is provided with an indicator, the operator can confirm that the setting operation is normally performed by the display of the load current setting device, which is convenient.

Furthermore, it is easy to connect with an assembly line for assembling the power supply while moving in the horizontal direction, and the assembled power supply is moved horizontally and placed directly on the test apparatus of the present invention as it is for testing. It can be carried out. There is no need to transport or move the power supply up or down. Further, even when conducting a heat load test, it is not necessary to remove the electronic load from the electronic load and replace it in the temperature tank as in the conventional case, or to put the entire electronic load device in FIG. 10 in the temperature tank. Since the worker only has to perform the simple work of connecting and disconnecting the power supply device to and from the electronic load unit on the pallet, there are many advantages in terms of both labor and assembly cost.

[Brief description of drawings]

1 to 9 are views showing an embodiment of a test apparatus for a power supply device of the present invention. FIG. 1 is a plan view of a pallet on a conveyor, FIG. 2, FIG. 3, FIG. A plan view, a front view, a right side view, respectively, of the electronic load device, FIGS. 5 and 6 are explanatory views of the entire plane and front of the test device, and FIG. 7 is a relationship between the load current setting device and the electronic load control circuit. FIG. 8 is a block diagram of a load current setting device, FIG. 9 is a block diagram of an electronic load control circuit, and FIG. 10 is a front view of a conventional electronic load device. 10: conveyor, 11: pallet, 15: electronic load unit, 16:
Power supply, 22: Electronic load control circuit, 29: Load current setting device

Claims (4)

[Claims] 1. A load current setting device having a transmitting means arranged near a conveyor and a receiving means for receiving a signal from the load current setting device, and setting a load current for each channel of a power supply device in accordance with the signal. An electronic load unit equipped with an electronic load control circuit, and an electronic load unit and a pallet which is connected to the electronic load unit and on which a power supply device to be tested is placed and moved by a conveyor. A test apparatus for a power supply device, wherein transmission and reception of signals between control circuits are performed in a contactless manner by a signal transmission medium that propagates in the air. 2. A load current setting device having a transmission circuit arranged near the conveyor and a receiving circuit for receiving an optical signal from the load current setting device, and a load current for each channel of the power supply device according to the optical signal. An electronic load unit having an electronic load control circuit for setting, and an electronic load unit and a pallet that is moved by a conveyor on which a power supply device connected to the electronic load unit to be tested is placed, and a load current setting device The transmission circuit transmits the current value data signal and the control signal as an optical signal, and the reception circuit of the electronic load control circuit receives the current value data signal and the control signal as an optical signal without requiring a physical connection. A power supply device testing apparatus characterized by the above. 3. A load current setting device, a switch part for setting a load current of a power supply device for each channel, and a circuit for transmitting a data signal of the set current value together with a control signal as an optical signal to an electronic load control circuit. The electronic load control circuit comprises a circuit for receiving an optical signal from the load current setting device,
A latch circuit for inputting a data signal for each channel, and a switch for flowing the set load current for each channel to the electronic load by selecting a resistor for controlling an electronic load by the output of the latch circuit and connecting the resistor to the electronic load. The test apparatus for a power supply device according to claim 2, comprising a circuit. 4. The test apparatus for the power supply device according to claim 3, wherein the load current setting device receives a start signal from the electronic load control circuit and transmits the set value from the switch section to the electronic load control circuit. .