JP2023086056A - Potential stabilization circuit - Google Patents

Abstract

To provide a circuit and a method for simply and inexpensively realizing low noise and low impedance potential at an arbitrary point in an electronic device.SOLUTION: A circuit includes a nonpolar capacitor C1 and a resistor R1. The nonpolar capacitor C1 and the resistor R1 are connected in series. Both ends of a circuit in which the nonpolar capacitor C1 and the resistor R1 are connected in series are connected to a potential for noise reduction and low impedance. The nonpolar capacitor C1 whose short circuit is suppressed by a resistor absorbs noise.SELECTED DRAWING: Figure 1

Description

The present invention is a simple circuit (hereinafter simply referred to as this circuit) that reduces noise and lowers the impedance of arbitrary potentials such as ground and power, which are necessary for stable operation and high performance of electronic equipment, without relying on other potentials. .) and related to a method to realize at low cost.

As a technique for noise reduction and impedance reduction of an arbitrary potential, there are techniques such as solid grounding and bypass capacitors.

In the case of the conventional method of solid grounding, the effect of lowering impedance mainly depends on the product of the solid area and the thickness of the conductor, so there are large restrictions on mounting. In addition, although the bypass capacitor can reduce the impedance, when a large load is applied to the circuit, an amplitude including the ground potential, which is the operating standard, is generated in each potential, which adversely affects the accuracy of circuit operation. There is

In order to reduce the effect of the load on the potential, a non-polar capacitor C1 with sufficient withstand voltage and a resistor R1 are used to reduce the amplitude of the potential. .

When both terminals of the capacitor C1 are connected to the same potential without using the resistor R1, both terminals of the capacitor C1 are short-circuited, and even if there is an amplitude in the potential, the potentials of both terminals are the same. Although charging and discharging are not performed, the capacitor has a low impedance to alternating current, and by using the resistor R1 to prevent short-circuiting, the capacitor C1 is encouraged to charge and discharge in order to maintain a constant potential with the outside of the device and other circuits, resulting in noise. is reduced.

By synthesizing the impedance of this circuit and the impedance of the potential conductor, the impedance of the power supply and ground inside the device is also reduced.

Since this circuit can stabilize the electric potential in an electronic device with an inexpensive and simple circuit, it is possible to benefit from stabilization and higher performance in a wide variety of electronic devices.

Fig. 3 shows an exemplary embodiment of the invention;

The connection terminal 1 in FIG. 1 is connected to a conductor of arbitrary potential for noise reduction and low impedance. In this case it is not necessary to limit it to ground.

A simple circuit can contribute to the stabilization and performance improvement of all electronic devices at a low cost. In particular, the fact that even inexpensive equipment can be easily adopted is considered to greatly contribute to the development of industry.

R1 resistor C1 non-polar capacitor 1 terminal to be connected to arbitrary potential

In order to stably operate and maintain the performance of electronic equipment, it is necessary to remove noise that enters from the power supply and noise based on fluctuations in the space potential. Therefore, it is conventionally recommended to connect electronic devices to the ground, and the quality of the ground as the connection destination determines the stable operation and performance maintenance of the electronic device. An ideal ground is a ground with a low ground resistance that is directly connected to the ground, but depending on the installation conditions of the electronic equipment, it is not possible to prepare such an ideal ground. For example, in the case of high-rise buildings, the distance to the ground is long, and the inductance component of the copper wire cannot be ignored, so it is far from an ideal ground. Also, even if it is close to the surface of the earth, in recent years many electronic devices have been densely packed, so noise currents of other electronic devices are flowing underground, and it is observed that noise enters from the ground wire instead.

The present invention relates to a technique for stabilizing arbitrary potentials such as grounds and power supplies with a simple circuit (hereinafter simply referred to as this circuit), which is necessary for stable operation and high performance of electronic equipment.

As an example of a virtual earth, an example of using a flowerpot containing earth and sand is shown in Document 1 (Kenichi Ito, "The story of earth and noise read with illustrations", Nikkan Kogyo Shimbun, first edition 2002). It has long been known that a conductor acts as a virtual earth. However, from experience, a physically large conductor is required to obtain a sufficient effect with a virtual earth, and it is often not possible to prepare such a conductor. As a circuit mounting technology, there are methods such as solid grounding and bypass capacitors as methods for reducing noise at arbitrary potentials and lowering impedance.

In the case of the conventional method of solid grounding, the effect of lowering impedance mainly depends on the product of the solid area and the thickness of the conductor, so there are large restrictions on mounting. In addition, although the bypass capacitor can reduce the impedance, when a large load is applied to the circuit, an amplitude including the ground potential, which is the operating standard, is generated in each potential, which adversely affects the accuracy of circuit operation. There is

In order to absorb potential fluctuations, an electrical box is required in which a large amount of electric charge can be freely taken in and out and stored, and a capacitor C1 is used as an electronic component. However, when one terminal of the single ideal capacitor C1 is open and charge flows into and out of the other terminal, the potential of the terminal through which the charge flows in and out fluctuates, effectively absorbing potential fluctuations. not be a device.

Therefore, both terminals of the capacitor C1 and both terminals of the resistor R1 are connected. See Figure 1. As a result, the charge stored in the capacitor C1 is released with a time delay, and the potential difference between the two terminals of the capacitor C1 returns to zero, thereby realizing the function of continuously transferring the charge.

This circuit can stabilize the reference potential of electronic equipment, and it can be attached externally to the equipment, or it can be built in due to its small size. It is possible to receive the benefits of transformation.

Fig. 3 shows an exemplary embodiment of the invention;

The connection terminal 1 in FIG. 1 is connected to a conductor of arbitrary potential to be stabilized. In this case it is not necessary to limit it to ground.

It is believed that it will promote the stabilization and performance improvement of electronic equipment and greatly contribute to the development of industry.

R1 Resistor C1 Non-polar capacitor 1 Terminal connected to arbitrary potential

Claims (2)

A circuit that achieves low-cost noise reduction and low impedance for any potential of electronic equipment without relying on other potentials. A circuit that realizes virtual grounding for the purpose of improving the stability and performance of electronic equipment when grounding work is difficult.

Images