Current sampling circuit based on bridge circuit

A current sampling and bridge circuit technology, applied in the direction of measuring current/voltage, high-efficiency power electronic conversion, electrical components, etc., can solve the problem of inability to distinguish the transformer positively induced current circuit, etc., to protect circuit safety, ensure stability, To avoid the effect of induced current

Active Publication Date: 2021-07-02
HANGZHOU EV TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the problem that the sampling circuit in the prior art cannot distinguish the positive induced current of the transformer, which leads to abnormal operation of the circuit; it provides a current sampling circuit based on a bridge circuit, which can control the current sampling interval, thereby avoiding sampling to The transformer induces current to ensure the stability of the circuit operation

Method used

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  • Current sampling circuit based on bridge circuit
  • Current sampling circuit based on bridge circuit
  • Current sampling circuit based on bridge circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: A current sampling circuit based on a bridge circuit, including a rectifier circuit 2, the rectifier circuit includes a first rectifier bridge arm formed by connecting a first switching tube Q1 and a second diode D2 in series, and a second switching tube Q2 The second rectification bridge arm is formed by connecting in series with the first diode D1, wherein the first rectification bridge arm and the second rectification bridge arm are connected in parallel, and the common node of the first switching tube and the second diode forms the first rectification bridge The midpoint of the arm, the common node of the second switch tube and the first diode forms the midpoint of the second rectifier bridge arm; the detection resistor unit (such as figure 1 The detection resistor R1 in the middle) is connected in parallel with the first rectifier bridge arm and the second rectifier bridge arm; the current transformer T1 includes a primary winding and a secondary windi...

Embodiment 2

[0033] Embodiment 2, a current sampling circuit based on a bridge circuit. The difference between this embodiment and Embodiment 1 is that the primary winding of the current transformer T1 and the secondary winding of the current transformer T1 have different names. Connection, all the other structures are the same as in Embodiment 1. In this embodiment, when the controller controls the conduction of the MOS transistor Q3 and the MOS transistor Q6, it also controls the synchronous conduction of the MOS transistor Q2 (that is, the MOS transistor Q3, the MOS transistor Q6 and the Q2 receive the same control signal). When the secondary side synchronous rectification is turned on, the primary side circuit will flow an induced current (such as Image 6 As shown by the middle arrow, it can also be called negative current), at this time, the primary current of the current transformer T1 flows in from the terminal with the same name, and the secondary current of the current transforme...

Embodiment 3

[0036] Embodiment 3. In this embodiment, the end with the same name of the primary winding of the current transformer T1 is connected to the primary winding of the transformer, and the primary winding of the current transformer T1 is connected to the primary winding of the transformer and the second bridge arm of the full bridge circuit. Between the midpoints, the current transformer T1 is connected to the terminal with the same name, and the other circuit connection structures are the same as those in the first embodiment.

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Abstract

The invention discloses a current sampling circuit based on a bridge circuit, which comprises a first rectifier bridge arm formed by connecting a first switch tube and a second diode in series, and a second rectifier bridge arm formed by connecting a second switch tube and a first diode in series, the first rectifier bridge arm and the second rectifier bridge arm are connected in parallel, a common node of the first switch tube and the second diode forms a midpoint of the first rectifier bridge arm, and a common node of the second switch tube and the first diode forms a midpoint of the second rectifier bridge arm; and the current sampling circuit also comprises a detection resistor unit, which is connected in parallel with the first rectifier bridge arm and the second rectifier bridge arm. A peak current controller is used for controlling the bridge unit and the switching tube of the rectifying circuit, so that the problem of reverse current of the primary side of a transformer caused by starting of secondary side synchronous rectification is prevented, the circuit safety is effectively protected, the current sampling interval can be controlled, the negative current of the transformer is prevented from being sampled, and the working stability of the circuit is ensured.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a current sampling circuit based on a bridge circuit. Background technique [0002] With the explosive growth of new energy vehicles, the demand for on-board chargers and on-board DC-DC has also increased significantly. Due to the wide voltage range of vehicle power batteries and low-voltage batteries, bridge DC-DC circuits that can simultaneously realize wide-range input and wide-range output have been widely used. The control or protection of the bridge circuit needs to rely on the accurate sampling of the current waveform on the primary side of the transformer. Using the current transformer CT for sampling can achieve high precision, low delay, and low cost, so it has been widely used. [0003] However, when the bridge circuit uses synchronous rectification, since the secondary side synchronous rectification is turned on, the reverse current will appear on the prima...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00G01R19/00H02M1/088H02M1/32H02M3/335
CPCH02M1/00H02M1/088H02M1/32H02M3/33592Y02B70/10H02M7/219H02M3/33571H02M3/33573H02M1/0009
Inventor 徐晨汀陶斯力贺强平定钢
Owner HANGZHOU EV TECH CO LTD
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