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General resistor-capacitor parallel circuit for limiting time constant

A time-limited, parallel technology, applied in electrical components, output power conversion devices, etc., can solve problems such as device hazards, and achieve the effect of ensuring safety and reliability

Inactive Publication Date: 2014-01-01
孟加顷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, almost all such circuits have congenital defects in practical applications, so that the devices that should have filtering functions accumulate and generate new high-intensity harmonic impacts, causing harm to related devices on the entire circuit

Method used

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  • General resistor-capacitor parallel circuit for limiting time constant
  • General resistor-capacitor parallel circuit for limiting time constant
  • General resistor-capacitor parallel circuit for limiting time constant

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Embodiment 1

[0014] Embodiment 1: The present invention provides a general resistance-capacitance parallel circuit with a limited time constant, which includes a resistor 1 for providing a discharge circuit for a capacitor, and a capacitor 2 connected in parallel at both ends of the resistor 1, wherein the The capacitance of the capacitor 2 matches the power consumption in the circuit and the electromagnetic compatibility index, and the product of the resistance value of the resistor 1 set in parallel and the capacitance of the capacitor 2 is less than or equal to the alternating current cycle time, that is, the parallel connection The discharge time constant of the resistor 1 and the capacitor 2 is less than or equal to the AC cycle time,

[0015] R × C ≤ T, or Where T is the cycle time of alternating current, f is the power frequency,

[0016] When f=50Hz, C=0.1μF, then R≤200000Ω, the resistance-capacitance parallel circuit of this configuration parameter can make the whole circuit in ...

Embodiment 2

[0017] Preferred embodiment two: a kind of universal resistance-capacitance parallel circuit with limited time constant as described in embodiment one, the capacity value of capacitor 2 matches the power supply and the electromagnetic compatibility index consumed in the circuit, and the described in parallel arrangement The product of the resistance value of the resistor 1 and the capacitance of the capacitor 2 is less than or equal to the half cycle time of the alternating current, that is, the discharge time constant of the resistor 1 and the capacitor 2 connected in parallel is less than or equal to the half cycle time of the alternating current. In this embodiment, the filter capacitor can be discharged cleanly within the natural power frequency half cycle without accumulating any residual charge.

[0018] R × C ≤ T 2 , or R × C ≤ ...

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Abstract

The invention provides a general resistor-capacitor parallel circuit for limiting a time constant. The general resistor-capacitor parallel circuit comprises a resistor (1) and capacitors (2), wherein the resistor is used for providing a discharge loop for the capacitors, and the capacitors are connected to the two ends of the resistor (1) in parallel. A capacitance value C of the capacitors (2) is matched with power consumed in the circuit and an electromagnetic compatibility index, the arithmetic product of a resistance value R of the resistor (1) arranged in parallel and the capacitance value C of the capacitors (2) is smaller than or equal to periodic time T of connected alternating current, and in other words, the discharge time constant of the resistor (1) and the capacitors (2) is smaller than or equal to the periodic time T of the connected alternating current, wherein the resistor (1) and the capacitors (2) are connected in parallel. The whole resistor-capacitor parallel circuit with the configuration parameters can be in a relatively safe power source environment.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a general resistance-capacitance parallel circuit with a limited time constant. Background technique [0002] With the mass production and wide use of various electronic appliances, a general-purpose filter circuit for filtering the ripple in the input AC power supply will be installed in the electronic circuit. Generally, a capacitor C is connected in parallel at both ends of the load resistor. In the original design idea, the capacitor connected in parallel at both ends of the resistor is used to filter high-frequency AC harmonics. The circuit design selects the parameters of this capacitor according to the power consumption of the electrical appliance and the requirements of electromagnetic compatibility indicators. For the resistor connected in parallel with this capacitor, the general R value is 470000 ohms, or even larger. Taking the most common 470000 ohm as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12
Inventor 孟加顷
Owner 孟加顷
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