Current detection circuit with current compensation and temperature compensation
A technology of current detection circuit and temperature compensation, which is applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of error, high failure rate, and high cost of current detection circuit, and achieve accurate voltage drop, precise detection, The effect of reducing production costs
Active Publication Date: 2013-11-06
VERTIV CORP
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to provide a current detection circuit with current and temperature compensation in view of defects such as high cost, high failure rate, and errors caused by the introduction of diodes in the current detection circuit of the prior art
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Embodiment Construction
[0018] Such as figure 1 As shown, the current detection circuit with current and temperature compensation of the present invention includes: a current detection circuit 1 connected in series with the switch tube of the power converter for collecting the inductor current of the power converter and a current detection circuit 1 for providing Diode compensated voltage source circuit 2 for voltage and temperature compensation.
[0019] The current detection circuit 1 includes a current collection circuit 11 and a detection error correction circuit 12 for correcting the current detected by the current collection circuit 11 .
[0020] The current collection circuit 11 includes a current transformer CT1, a third diode D3, a seventh resistor R7, and an eighth resistor R8. Wherein, the primary winding of the current transformer CT1 is connected in series with the switch tube of the power converter under test, the seventh resistor R7 is connected in parallel with the secondary winding ...
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The invention relates to a current detection circuit with current compensation and temperature compensation. The current detection circuit comprises a current detection circuit and a diode compensation voltage source circuit used for providing voltage compensation and the temperature compensation for the current detection circuit, wherein the current detection circuit comprises a current acquisition circuit and a detection error-correction circuit used for correcting the current to be detected; a second diode, a capacitor and a sixth resistance of the detection error-correction circuit construct a current falling edge and simulate the current waveform of inductance. For the reason that a first diode in the diode compensation voltage source circuit and the second diode in the detection error-correction circuit are diodes adopting the same performance parameters, resistance value is adjusted to control the power consumption of the diodes and to keep the pressure drops and the temperatures of the two diodes to be approximately same at the same time, so that accurate compensation of the pressure drops of the diodes is realized, and accurate detection in wider current and temperature scopes can be realized; and only one current transformer is adopted by the current detection circuit with the current compensation and the temperature compensation, thereby lowering the manufacturing cost.
Description
technical field [0001] The invention relates to a current detection circuit of a power converter, more specifically, to a current detection circuit with current and temperature compensation. Background technique [0002] At present, there are mainly the following ways to detect the inductor current of the power electronic power converter: 1. Use a Hall device to cover the inductor; 2. Connect a current transformer (current transformer, CT ), the inductor current is obtained by adding the currents of two CTs; third, only one CT is connected in series with the switch tube, and the current of the inductor is estimated by the current of this CT. The advantage of solution one is that the circuit is simple to implement, but the disadvantage is that the cost of the Hall device is high and the failure rate is high; the failure rate of solution two is greatly reduced compared with solution one, but the cost of the two CTs is still high, and The CT is placed in the high-frequency loo...
Claims
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IPC IPC(8): G01R19/00G01R19/32G01R35/00
Inventor 周原崔彬游永亮
Owner VERTIV CORP