JP2509634B2 - Current detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] This invention relates to a current detector mounted on an artificial satellite and used for collector current telemetry of a power supply for a TWT (traveling wave tube).

(Prior Art) Conventionally, the current detector used for the collector current telemetry of the power supply for TWT has a high voltage current path as shown in FIG.
A resistor R1 is interposed in 10 and a voltage generated across the resistor R1 is input to a V / F (voltage / frequency) converter 11 to output a pulse having a frequency corresponding to the voltage. Then, with this pulse insulated by the pulse transformer T1, F /
The voltage is transmitted to the V (frequency voltage) converter 12 and a voltage corresponding to the frequency of the pulse is output. By displaying this voltage level on the display circuit 13, the detected current I is displayed. In this case, V / F provided on the high voltage side
The output of the auxiliary power supply 14 floated by the pulse transformer T2 is supplied as a drive voltage source for an electronic circuit such as a converter or an amplifier circuit.

(Problems to be solved by the invention) As described above, in the conventional current detector, V / F is added to the high voltage section.
Since an electronic circuit such as a converter or an amplifier circuit is provided, an auxiliary power supply for driving this electronic circuit is required, which increases the size and capacity of the high voltage side. Also,
In the high voltage part, generally, the potting is performed by the insulating material, so that the weight is increased more than necessary.

The present invention has been made to solve the above problems, the high-voltage part has a simple structure, and can be downsized as a whole. In addition, the use of the F / V converter does not affect other circuits. It is an object of the present invention to provide a current detector with less power consumption.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, a current detector according to the present invention includes a diode interposed in a forward direction in a high-voltage current path and a fixed interval in the diode. A first switching control means for intermittently connecting the first bypass current path in parallel and a first switching control means for connecting in parallel to the second bypass current path in the opposite phase to the first switching control means. Two
And a current for generating first and second currents corresponding to the currents flowing through the bypass current paths, which are mounted in the first and second bypass current paths such that magnetic fields are generated in opposite directions. It comprises a transformer and an output means for rectifying and combining the first and second currents generated in the current transformer to generate a detection output.

(Operation) In the current detector having the above-described configuration, the current to be measured is alternately and intermittently passed through the first and second bypass current paths to make an apparent alternating current, and this alternating current is detected by the current transformer and rectified. The detected output.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows the configuration thereof. A diode D1 is interposed in the forward direction in the high voltage current path 21, and the diode D1 is connected in parallel to the first and second bypasses by the switching ON operation of the transistors Q1 and Q2. The current paths 22 and 23 are connected. Output pulses (constant frequency) of the pulse generator 24 are supplied to the transistors Q1 and Q2 in opposite phases by the pulse transformer PT.

In the first and second bypass current paths 22 and 23, the current transformer CT is arranged so that the directions of the magnetic fields are opposite to each other.
Is provided. This current transformer CT is a transistor
The on / off operation of Q1 and Q2 detects the currents that flow intermittently in the first and second bypass current paths 22 and 23. Each current detected by this current transformer CT is detected by the diodes D2 and D3. After being rectified, they are combined and the resistance R
Is supplied to. The voltage VM generated in the resistor R is supplied to a display circuit (not shown) as a detection voltage.

The operation of the above configuration will be described below with reference to FIG.

First, the diode D1 interposed in the high voltage current path 21 is for ensuring that the measured current I flows into the bypass current paths 22 and 23 when the transistors Q1 and Q2 are turned on. Here, from the pulse generator 24, FIG.
If a pulse as shown in FIG. 2 is output, an in-phase pulse is supplied to the transistor Q1 as shown in FIG. 2 (b), and an in-phase pulse is supplied to Q2 as shown in FIG. 2 (c). The transistors Q1 and Q2 are turned on when the input pulse has a positive polarity, and the current I to be measured alternately flows through the bypass current paths 22 and 23.

When the currents flowing through the first and second bypass current paths 22 and 23 are intermittent in this way, magnetic fields in opposite directions are generated in the current transformer CT, so that the combined output current of the diodes D2 and D3 becomes continuous. That is, since no output is obtained from the current transformer CT with a continuous current, the measured current I is alternately and intermittently applied to the first and second bypass current paths 22 and 23 to form an apparent alternating current. Is detected by the current transformer CT. For example, if the measured current I as shown in FIG. 2 (d) flows through the high voltage current path 21, the current flowing through the resistor R becomes as shown in FIG. 2 (e), which corresponds to the change in the measured current. As a result, the voltage generated by the resistor R changes. The measured current value can be displayed by displaying the generated voltage of the resistor R as a detection voltage on the display circuit.

Therefore, the current detector with the above-described configuration has few high-voltage parts, does not require an electronic circuit such as a V / F converter or an amplifier circuit, and does not require an auxiliary power supply for driving this electronic circuit. It is possible to reduce the size and volume of the portion, reduce the potting amount, and reduce the weight. Furthermore, since a circuit whose frequency fluctuates, such as an F / V converter, is not used, it has little influence on other circuits.

The transistors Q1 and Q2 may be bipolar type, but may be MOS-FET or the like. If diodes are connected in parallel to the high-voltage current path in opposite directions, no voltage will be generated in the diodes when the polarities of the currents to be measured are reversed, so that it is safer. Further, the terminating resistor R of the current transformer CT may be provided in front of the diodes D2 and D3 without any problem.

[Effects of the Invention] As described above, according to the present invention, the configuration of the high-voltage section is simple, the overall size can be reduced, and the current that has little influence on other circuits due to the non-use of the F / V converter. A detector can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an embodiment of a current detector according to the present invention, FIG. 2 is a waveform diagram for explaining the operation of the embodiment, and FIG. It is a block circuit diagram which shows the structure of a current detector. 11 …… V / F converter, 12 …… F / V converter, 13 …… Display circuit, 14 …… Auxiliary power supply, 21 …… High voltage current path, 22,23…
… Bypass current path, 24 …… Pulse generator, Q1, Q2 …… Transistor, PT …… Pulse transformer, CT …… Current transformer, D1 to D3 …… Diode, R …… Detection resistance.

Claims (1)

(57) [Claims] 1. A diode interposed in a forward direction in a high voltage current path, a first switching control means for connecting a first bypass current path in parallel to the diode at regular intervals and the first switching. Second switching control means for connecting to a second bypass current path in parallel by connecting to the diode in reverse phase to the control means; and the first and second switching control means.
Current transformers that are mounted in the bypass current paths so that magnetic fields are generated in opposite directions, and that generate first and second currents corresponding to the currents flowing in the bypass current paths, and the first and second current transformers that occur in the current transformers. A current detector, comprising: an output unit that rectifies and synthesizes the second current to generate a detection output.