JPS62200276A - Battery residue capacity meter - Google Patents

Abstract

PURPOSE:To enable continuous display of the residual capacity of a storage battery accurately regardless of duration of a discharge or stoppage, by a method wherein at the moment when the battery voltage goes down with the application of a load to the storage battery, the voltage held in an analog peak holding circuit is memorized as open circuit voltage while the residual capacity is outputted. CONSTITUTION:When a switch 6 is closed, an (F), (E) and (T) switches 7 are turned ON, a divided open circuit voltage is charged into an analog peak holding circuit 4 through an operational amplifier 3 and memorized. When the battery voltage is lowered with the application of a load on a storage battery 1, the electric charge of a capacitor 9 of the circuit 4 is discharged gradually by an impedance in the circuit 4. Because creating a virtual battery discharge property, the drop in the lowered potential of the capacitor 9 can be changed easily depending on the resistance of the circuit 4 or the capacitance of the battery 1, the open circuit voltage rises higher than the voltage memorized in the circuit 4, it is recharged into the circuit 4 via an antireversion diode 8 to be make up for as new open circuit voltage. This enables continuous and accurate display of a residual capacity of the battery regardless of the duration of discharge or stoppage.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Application The present invention relates to a storage battery remaining capacity meter that has a function of continuously displaying the remaining capacity of a storage battery with a meter or digitally regardless of the presence or absence of a load.

Conventional technology Generally, in order to know the discharge state of a storage battery, the specific gravity of the electrolyte in the storage battery is measured, and the remaining capacity is determined from that value. The method of estimating # is the most accurate.

Problems to be Solved by the Invention For this reason, as a method for electrically calculating the electrolyte ratio i#- and converting the specific gravity value of the clarified solution into capacity and displaying it, conventional methods have been to use a float having a predetermined specific gravity. A method of directly inserting a sensor such as the float into the solution and converting the float displacement into a nausea signal to display the remaining capacity has been considered. However, with this method, air bubbles generated in the float may adhere to the surface of the float, causing malfunctions, and the circuit is complicated as minute displacements are converted into electrical codes (2). There was a problem in that it was difficult to apply it to storage batteries for power vehicles because it was subject to vibration.

Optical and ultrasonic methods have also been developed that utilize the refractive index of the electrolyte, but the optical method uses a sensor such as a prism or glass fiber to apply a certain amount of light to the sensor, and This method takes advantage of the fact that the amount of light from the light source changes depending on the specific gravity of the electrolyte, but it has the disadvantage of malfunctioning if dirt, etc. adheres to the sensor surface. The propagation characteristics are used to measure the velocity of sound waves in the electrolyte between the ultrasonic transmitter/receiver and the ultrasonic reflector, and the information is converted into an electrical signal to display the specific gravity and remaining capacity of the electrolyte, but the electrical circuit is very difficult to use. Due to its complexity, it is difficult to downsize and is unsuitable for use in a forklift truck.

The present invention solves the problems of 10Ne, that is, by connecting a storage battery voltage dividing circuit C ni operational amplifier etc., the voltage obtained by the operational amplifier etc. has an analog peak. This is a storage battery residual capacity weight meter connected to a holding circuit, and equipped with an amplifier such as an operational amplifier connected to the analog peak holding circuit, and an indicator such as a meter connected to the output of the amplifier.

Focusing on the fact that the pressure (pressure) has a high correlation with the specific gravity of the silica liquid of heavy oil, we stored the open circuit voltage in an analog peak holding circuit with a virtual plate characteristic of a storage battery, and displayed it on a meter, etc. In livestock storage ponds used for powering forklifts, etc., the storage battery voltage fluctuates greatly depending on the size of the load (discharge current), so when there is a load, the voltage of the storage battery in the analog peak holding circuit is The remaining capacity is displayed from the virtual unlimited characteristic.Also, when the strawberry battery open circuit pressure rises above the virtual discharge characteristic during no-load, it is stored again as the open circuit chamber pressure in the analog peak holding circuit, and the virtual discharge characteristic is corrected to accurately display the remaining capacity. This allows you to consider the remaining capacity by displaying it.

Example An embodiment of the present invention will be described.

] is a storage battery, 2 is a circuit that divides the storage battery voltage, and 3 is a circuit that divides the voltage of the storage battery into a practical voltage (46.3V to 50.8V).
) This is an operational amplifier for converting l2f.

The central voltage is connected to the analog peak holding circuit 4 via a backflow prevention diode 8. The analog peak holding circuit 4 is connected to the display device 5ζ. To explain specifically about the furnace, when the switch 6 is turned on, the F and JT switches 7 are turned on, and the divided open circuit voltage passes through the operational amplifier 3 and is charged and stored in the analog peak holding circuit 4. When a load is applied to the stored fuel oil 1 and the storage battery voltage decreases, the charge in the capacitor 9 of the analog peak holding circuit 4 is gradually discharged by the impedance within the analog peak holding circuit 4.

At this time, the potential drop of the capacitor 9 can be easily changed by changing the resistance of the analog peak holding circuit 4 or the capacitance of the capacitor in order to have virtual storage battery discharge characteristics. Next, when the storage battery 1 is in a low state (no load) and the open circuit voltage increases and becomes higher than the voltage stored in the analog peak holding circuit 4, a photovoltaic signal is applied to the analog peak holding circuit 4 again via the reverse current prevention diode 8. and corrected as the new open circuit voltage.

By simply connecting both ends of the storage battery 1 as described above, it is possible to continuously and accurately display the remaining capacity of the slag oil (TV) regardless of whether it is discharging or not.

Effects of the Invention As described above, the present invention is an excellent method that can accurately and continuously display the remaining capacity of a storage battery regardless of whether it is being discharged or not, without inserting a sensor or the like into the electrolyte. It has its advantages.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention. 1 is a storage battery, 2 is a voltage dividing circuit, 3 is an operational amplifier, 4 is an analog peak circuit, 5 is a display, 6 is a switch, 7 is F,
, T switch, 8 is reverse current prevention diode, 9 is capacitor

Claims (1)

[Claims] It is equipped with an analog peak holding circuit that has virtual discharge characteristics of the storage battery, and at the moment when a load is applied to the storage battery and the storage battery voltage drops, the voltage held in the analog peak holding circuit is stored as an open circuit voltage, and the remaining capacity of the storage battery is stored. A storage battery remaining capacity meter that outputs .