JPH0568661B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current integrator, and more specifically, it is capable of integrating and displaying a plurality of current values, and is used for managing a plating bath in which a plurality of continuous plating lines are constructed. The present invention relates to a suitable current integrator.

In the plating process, knowing the integrated value of the plating current is important for bath management in consideration of the amount of precipitation, bath life, etc. In the current plating process, for example, when plating metal strips such as lead frames for semiconductor devices, multiple metal strips are used, each with different plating conditions such as current value (therefore, the power supply is A multiple line method is also adopted in which the metal is passed through the same plating line (each with a different color). Conventionally, the above-mentioned integrated current values have been managed by preparing one current integrator for each plating line and summing the individually integrated current values, which has the drawback of being inefficient.

The present invention has been made in view of the above-mentioned difficulties, and its purpose is to provide a current integrator that can integrate a plurality of current values and immediately know the total value. A plurality of input sections are provided to handle this, a shunt circuit that shunts the current input to each of these input parts, and a shunt circuit that divides each current shunted by the shunt circuit at a fixed time interval. an integrating circuit that detects the presence or absence of an integrated value or whether or not the integrated value is greater than or equal to a reference integrated value; a memory circuit that stores each of the detection results; and a timing pulse is input to each of the memory circuits to perform the a timing pulse generation circuit that detects when an integrated value is present or when the integrated value exceeds a reference integrated value and erases the stored result; and the detection result detected by the timing pulse of this timing pulse generating circuit. and a counting circuit that counts the total current and displays the total current integrated value.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The figure shows an example of a current integrator used in a 4-line continuous plating device or the like. 10a, 10b, 10
Reference characters c and 10d are input sections, which are provided in four channels corresponding to each plating line. Each input section 10a, 1
0b, 10c, 10d have shunt circuits 12a, 12
b, 12c, and 12d are respectively connected, and each of these shunt circuits is connected to an integrating circuit 14a, 14, respectively.
b, 14c, and 14d are connected. The current input to each input section 10 is shunted by the shunt circuit 12, and this shunted current is input to the integration circuit 14. In the integrating circuit 14, the shunt current flows for a certain period of time,
For example, it is divided and integrated every 60 msec. Depending on whether the integral value at each fixed time is greater than or equal to the reference integral value, it is converted into a signal of 1 if it is greater than or equal to the reference integral value, and a signal of 0 if it is less than the reference integral value, and this signal is stored. Circuits 16a, 16b, 16
c, 16d. 18 is a timing pulse generation circuit that continuously generates pulses at minute time intervals, and this pulse signal is sent to the memory circuit 16 mentioned above.
are input sequentially starting from channel 1. According to this timing pulse, only one signal among the signals stored in the memory circuit 16 is detected,
This detection signal is input to the counting circuit 20 and counted up. The memory of the memory circuit 16 after the scanning of the timing pulse is erased, and the memory is newly reset. By sequentially and continuously performing scanning using this timing pulse, the total current integrated value is displayed on the counting circuit 20 as the count multiplied by the reference integrated value. Although the above example uses four channels, it goes without saying that a plurality of channels can be used as appropriate.

For example, in the case of a multi-line plating device, the reference value of the integral value converted into a 1 or 0 signal by the integrating circuit 14 is based on the lowest current value among the current values of each line. By employing the actually measured integral value, it is possible to know the outline of the total current integral value without omission. Alternatively, the reference integral value of each line can be set separately according to the actually measured integral value of each line, and the counting circuit 20 can display the total number of counts x the average value of the actually measured integral value to more accurately calculate the total current. The integrated value can be displayed.

Furthermore, since the reference integral value can be actually measured for each line, the integrating circuit 14 determines whether or not current has flowed at regular time intervals, and if it has flowed, a signal of 1 is output, or if no current has flowed at all. In this case, it is possible to output a 0 signal, count up only a 1 signal as described above, and obtain the total current integral value as the average value of this count multiplied by the actually measured integral value.

As described above, according to the current integrator according to the present invention, the total integrated value of the current values of multiple lines can be immediately known, and it can be used to manage plating solutions in which continuous plating is performed on multiple lines. It is particularly suitable and has a simple configuration, so it has the remarkable effect of being able to be provided at low cost.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a current integrator with four input sections. 10a, 10b, 10c, 10d...input section,
12a, 12b, 12c, 12d... shunt circuit,
14a, 14b, 14c, 14d...integrator circuit,
16a, 16b, 16c, 16d...integrator circuit,
18...timing pulse generation circuit, 20... counting circuit.

Claims (1)

[Claims] 1. A plurality of input sections provided to be able to handle a plurality of currents, a shunt circuit that shunts the current input to each input section, and a shunt circuit that shunts the current input to each of the input parts. an integrating circuit that detects the presence or absence of an integrated value of each current for a certain period of time or whether or not the integrated value is greater than or equal to a reference integrated value; a memory circuit that stores each of the detection results; and a timing pulse for each of the memory circuits. a timing pulse generating circuit that detects when the integrated value is input and the integrated value exceeds the reference integrated value, and erases the stored result; and the timing pulse of this timing pulse generating circuit. A current integrator comprising: a counting circuit that counts the detected detection results and displays a total current integrated value.