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Direct-current detection circuit and variable-frequency air conditioner using same

A technology of DC current and detection circuit, applied in the measurement of current/voltage, application, measurement of electrical variables, etc., can solve the problem of DC current detection without inverter air conditioner

Active Publication Date: 2011-08-24
HISENSE (SHANDONG) AIR CONDITIONING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no suitable method for detecting the DC current on the inverter air conditioner

Method used

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  • Direct-current detection circuit and variable-frequency air conditioner using same
  • Direct-current detection circuit and variable-frequency air conditioner using same
  • Direct-current detection circuit and variable-frequency air conditioner using same

Examples

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Embodiment 1

[0020] Embodiment 1, the DC current detection circuit of this embodiment includes main components such as an integrated operational amplifier IC1, a current sampling resistor R and a feedback network, such as figure 1 shown. Among them, the current sampling resistor R receives the DC current to be detected, and after sampling, converts it into a DC sampling voltage and outputs it to the non-inverting input terminal + of the integrated operational amplifier IC1; the inverting input terminal of the integrated operational amplifier IC1 - is connected to the integrated operational amplifier IC1 through the feedback network The output terminal of the integrated operational amplifier IC1 outputs a voltage signal Vo that can reflect the magnitude of the DC current to be detected, so as to provide it to the subsequent circuit.

[0021] In this embodiment, the current sampling resistor R is adaptively configured according to the number of DC currents to be input to be detected, that is...

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Abstract

The invention discloses a direct-current detection circuit and a variable-frequency air conditioner using the same. The direct-current detection circuit comprises an integrated operational amplifier, a feedback network and current sampling resistors, wherein the feedback network is connected between the output end and the inversing input end of the integrated operational amplifier; the current sampling resistor is used for sampling the direct current to be detected; the number of the current sampling resistors is equal to the path number of the direct current to be detected; after the direct current to be detected is converted into a sampling voltage and the sampling voltage is superposed by a summator, the voltage is output to the same-phase input end of the integrated operational amplifier; and the output end of the integrated operational amplifier is used for outputting a voltage signal for reflecting the magnitude of the direct current to be detected. The voltage signal detected and output by the circuit reflects the current value input in real time, and the input current value can be indirectly calculated by detecting an output voltage value. Different output voltage protection values are set; and when the voltage value output by the circuit is detected to exceed the protection value, protection processing is carried out to achieve the purpose of protecting the input current.

Description

technical field [0001] The invention belongs to the technical field of detection circuits, and in particular relates to a test circuit for detecting the magnitude of a direct current and an inverter air conditioner designed using the direct current detection circuit. Background technique [0002] For the current air-conditioning system, components such as DC transformers are generally used to detect the AC current in the electronic control system, and through the detection of the AC current, the control of the air-conditioning system and the over-current protection function of the air-conditioning system are completed. [0003] For the frequency conversion air conditioning system, in order to meet the working requirements of the inverter in the electronic control system, it is necessary to design the rectification process of rectifying the AC power into DC power, and then use the inverter to invert the DC power generated by the rectification into AC power output for controll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00F24F11/00H02H7/00
Inventor 王伟杰王波
Owner HISENSE (SHANDONG) AIR CONDITIONING CO LTD
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