JPH0719010Y2 - Pulse current detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a pulse current detection device for detecting a peak value of a pulse current.

[Conventional technology]

It is often necessary to measure the peak value of the output pulse current in a pulse power supply or the like. In this case, as shown in FIG. 3, a circuit through which a pulse current flows (pulse power supply 1 + load 2)
Conventionally, the current transformer 6 is used to insulate the measurement system (peak detection circuit 5) and measure the peak value of the pulse current.

[Problems to be solved by the invention]

In this pulse current device, as shown in FIG. 4, the amplitude of the current transformer output waveform changes depending on the magnitude of the pulse width, and when the duty cycle of the pulse increases, the current transformer output voltage increases due to saturation of the magnetic flux of the current transformer 6. Has a drawback that it can be applied only when the pulse width is minute and the change in the pulse width is small. It is also conceivable to enlarge the iron core so that the current transformer 6 does not saturate the magnetic flux, but the shape becomes large and it becomes expensive.

[Means for Solving the Problems]

In the pulse current detector of the present invention, the current transformer is provided with a third winding whose direction is opposite to that of the ampere-turn of the primary curve of the current transformer and which has the same size. In response to this, when the duty cycle of the pulse current exceeds a predetermined value, the control circuit supplies a pulse current whose rising position is slightly deviated from that of the pulse current to the third winding.

[Action]

Therefore, even when a current with a large pulse width flows, the amplitude of the output waveform does not change unlike the conventional case.

〔Example〕

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

FIG. 1 is a block diagram of an embodiment of the pulse current detection device of the present invention, and FIGS. 2 (a), (b) and (c) are waveform diagrams thereof.

The pulse power supply 1 supplies a pulse current to the load 2. The current transformer 3 is provided with a third winding whose direction is opposite to that of the ampere-turn of the primary winding of the current transformer 3 and which has the same size. The control circuit 4 receives the pulse signal information from the pulse power supply 1, and when the current of the primary winding of the current transformer 3 is as shown in FIG. 2 (a), that is, the duty cycle of the pulse current has a predetermined value. When it exceeds, a pulse current whose rising position is slightly deviated from the pulse current is supplied to the third winding of the current transformer 3.
Therefore, the pulse current as shown in FIG. 2 (b) flows through the third winding of the current transformer, and the pulse waveform as shown in FIG. 3 (c) flows through the secondary winding of the current transformer 3. can get. That is, since the current in the third winding of the current transformer 3 cancels the magnetic flux generated by the current in the primary winding, the amplitude of the output waveform may change as in the conventional example even when a current with a large pulse width flows. Absent.

Although the pulse current detection in the case of the pulse power source is described in the present embodiment, it is obvious that the present invention can be applied to the load current detection of the pulsed load connected to the DC power source.

[Effect of device]

As described above, according to the present invention, the current transformer for detecting the pulse current is provided with the third winding, and the current of the third winding is controlled, so that the peak of the pulse current can be obtained regardless of the pulse width. The value can be detected, and the measurement accuracy is improved.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the pulse current detecting device of the present invention, FIG. 2 is its waveform diagram, FIG. 3 is a block diagram of a conventional example of the pulse current detecting device, and FIG. 4 is its waveform diagram. is there. 1 ... Pulse power supply, 2 ... Load, 3 ... Current transformer, 4 ...
Control circuit, 5 ... Peak detection circuit.

Claims (1)

[Scope of utility model registration request] 1. A pulse current detection device for detecting a peak value of the pulse current by isolating a circuit through which the pulse current flows and a measurement system with a current transformer, wherein the current transformer has a primary winding of the current transformer. When the third winding, which is opposite in direction to the ampere-turn of the wire and has the same size, is provided and the pulse signal information is received from the pulse power supply and the duty cycle of the pulse current exceeds a predetermined value, the pulse current and the rising edge rise. A pulse current detection device having a control circuit for supplying a pulse current whose position is slightly shifted to the third winding.