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Current mutual induction sampliing circuit and its resetting method

A sampling circuit and current transformer technology, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve the problem of small forward resistance of current transformers, low forward voltage of current transformers, and reverse current transformers Problems such as saturation and current waveform disorder

Inactive Publication Date: 2005-10-12
ASTEC POWER SUPPLY (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the forward resistance of the current transformer is very small, which will inevitably lead to the low forward voltage of the current transformer when it is reset, which will lead to the reverse saturation of the current transformer and the disorder of the current waveform.

Method used

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  • Current mutual induction sampliing circuit and its resetting method
  • Current mutual induction sampliing circuit and its resetting method
  • Current mutual induction sampliing circuit and its resetting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment one: if Figure 4 Shown is the circuit diagram of the first embodiment of the current mutual induction sampling circuit of the present invention; the shown current mutual induction sampling circuit includes a current transformer CT, a reset resistor R1, a fifth field effect transistor Q5 and a sixth field effect transistor Q6 connected in parallel , the second diode D2, the first diode D1 and the sampling resistor R2, the reset resistor R1 is connected to both ends of the secondary side of the current transformer CT, the primary side of the current transformer CT is connected in series in the sampled circuit, and the current transformer The primary side of CT is connected in series with the input bus of the sampled circuit. The sampled circuit is a full-wave rectification circuit, and the rectifier tubes of each arm of the full-wave rectification circuit are first, second, third and fourth field effect transistors Q1, Q2, Q3, Q4, and the second diode The ano...

Embodiment 2

[0017] Embodiment two: if Figure 5 As shown, the difference from the first embodiment is that the voltage clamping circuit 7 is formed by replacing the second diode D2 with the regulator tube D21.

Embodiment 3

[0018] Embodiment three: as Image 6 As shown, the difference from the first embodiment is that the voltage clamping circuit 7 is formed by replacing the second diode D2 with the third resistor R3.

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Abstract

A sampling circuit consists of current mutual inductor, reset resistance, switching circuit, voltage camping circuit. The reset resistance is connected to two sides of subedge on current mutual inductor as its prime edge is series-connected in circuit to be sampled, one end of voltage clamping circuit is connected to earthing and to one end of subedge on current mutual inductor via switching circuit as another end is connected to another end of subedge on current mutual inductor. As above connection scheme is applied, the reverse voltage drop of current mutual inductor is clamped in a certain limited value so current peak can be eliminated to ensure enough reset voltage.

Description

Technical field: [0001] The invention relates to a current mutual inductance sampling circuit applied in a double-terminal topological circuit and a reset method thereof. Background technique: [0002] The commonly used current sampling circuit is shown in Figure 1. The two ends of the primary side of the current transformer CT in the figure are connected in series to the input bus of the full-wave rectification circuit, and the reset resistor R1 of the current transformer is connected in series with the secondary side of the current transformer CT. At both ends of the current transformer CT, the first diode is connected in series with the current sampling resistor R2, and they are also connected in series at both ends of the secondary side of the current transformer CT. Generally, the value of the reset resistor R1 is much larger than that of R2. Normally, when the first or third switching tube (Q1, Q3) or the second or fourth switching tube (Q2, Q4) is turned on, there are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
Inventor 梁永涛徐光伟
Owner ASTEC POWER SUPPLY (SHENZHEN) CO LTD