CN-224216845-U - Battery electric quantity display circuit and battery electric quantity display device

CN224216845UCN 224216845 UCN224216845 UCN 224216845UCN-224216845-U

Abstract

The utility model provides a battery power display circuit and a battery power display device, wherein the battery power display circuit comprises a vibration detection module, a delay module, a switch module and a display module, wherein the vibration detection module is used for outputting a conducting signal when detecting a vibration signal of an external environment, the delay module is used for outputting a turn-off signal after delaying for a preset time, the switch module is used for controlling the display module to start working and outputting a battery voltage when receiving the conducting signal and controlling the display module to stop working when receiving the turn-off signal, and the display module is used for displaying power information according to the battery voltage. According to the utility model, the vibration signal in the environment is detected by the vibration detection module, a battery electric quantity display function can be realized without a mechanical switch, the sealing performance and the waterproof performance of the electronic equipment are improved, and the service life of the battery electric quantity display circuit is prolonged.

Inventors

TANG JINGYUAN
ZHANG JUYIN
Wei Zhengao
TAN DAZHEN

Assignees

深圳市中昌探伤器材有限公司

Dates

Publication Date: 20260508
Application Date: 20250711

Claims (8)

1. A battery power display circuit is characterized by comprising a vibration detection module, a delay module, a switch module and a display module, wherein, One end of the vibration detection module is externally connected with battery voltage, the other end of the vibration detection module is grounded, and the vibration detection module is used for outputting a conduction signal when detecting a vibration signal of an external environment; One end of the delay module is respectively connected with the vibration detection module and the battery voltage, the other end of the delay module is grounded, and the delay module is used for outputting a turn-off signal after delaying for a preset time; the power end of the switch module is connected with the battery voltage, the control end of the switch module is connected with the common connection end of the delay module and the vibration detection module, the voltage output end of the switch module is connected with the display module, and the switch module is used for controlling the display module to start working and outputting the battery voltage when receiving the on signal and controlling the display module to stop working when receiving the off signal; The display module is connected with the voltage output end of the switch module and is used for displaying electric quantity information according to the battery voltage.
2. The battery power display circuit according to claim 1, wherein the vibration detection module comprises a vibration switch, a first resistor, a second resistor and a first transistor, wherein one end of the vibration switch is connected with a battery voltage, the other end of the vibration switch is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the second resistor, the other end of the second resistor is grounded, a grid electrode of the first transistor is connected with a common connection end of the first resistor and the second resistor, a source electrode of the first transistor is connected with the time delay module, and a drain electrode of the first transistor is grounded.
3. The battery charge level display circuit of claim 1, wherein the delay module comprises a fifth resistor and a first capacitor, wherein, One end of the fifth resistor is connected with the control end of the switch module and the vibration detection module respectively, the other end of the fifth resistor is connected with one end of the first capacitor, and the other end of the first capacitor is grounded.
4. The battery power display circuit according to claim 1, wherein the switch module comprises a second transistor, a third resistor and a fourth resistor, wherein the second transistor is a PMOS transistor, one end of the third resistor and a source electrode of the second transistor are connected with a battery voltage, the other end of the third resistor is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the vibration detection module and the delay module respectively, a grid electrode of the second transistor is connected with a common connection end of the third resistor and the fourth resistor, and a drain electrode of the second transistor is connected with the display module.
5. The battery power display circuit according to claim 1, wherein the display module comprises a voltage early warning unit and at least one gear indication unit, wherein the voltage early warning unit and the gear indication unit are connected in parallel, and one end of the voltage early warning unit and one end of the gear indication unit are connected with a voltage output end of the switch module; The gear position indicating device comprises a battery voltage, a voltage early warning unit, a gear position indicating unit and a gear position indicating unit, wherein the battery voltage is smaller than an electric quantity reference voltage, the voltage early warning unit warns when the battery voltage is larger than the electric quantity reference voltage, the voltage early warning unit works when the battery voltage is larger than the electric quantity reference voltage, the gear position indicating unit works when the battery voltage is larger than the critical voltage, and the critical voltage of each gear position indicating unit is sequentially increased.
6. The battery power display circuit of claim 5, wherein the gear indication unit includes a first gear indication unit for comparing the battery voltage with a first threshold voltage, a second gear indication unit for operating when the battery voltage is greater than the first threshold voltage, a third gear indication unit for operating when the battery voltage is greater than the third threshold voltage, and a fourth gear indication unit for operating when the battery voltage is greater than the fourth threshold voltage, the power reference voltage is less than the first threshold voltage, the first threshold voltage is less than the second threshold voltage, the second threshold voltage is less than the third threshold voltage, and the third threshold voltage is less than the fourth threshold voltage.
7. The battery power display circuit according to claim 5, wherein the voltage early warning unit and/or the gear indication unit comprises a light emitting diode, a three-terminal shunt regulator, a voltage dropping resistor, a current limiting resistor, an upper voltage dividing resistor and a lower voltage dividing resistor, wherein an anode of the light emitting diode is connected with a voltage output end of the switch module, a cathode of the light emitting diode is connected with one end of the voltage dropping resistor, the other end of the voltage dropping resistor is connected with a cathode of the three-terminal shunt regulator, one end of the current limiting resistor is connected with an anode of the diode, the other end of the current limiting resistor is connected with a common connection end of the cathode of the light emitting diode and the voltage dropping resistor, one end of the upper voltage dividing resistor is connected with a voltage output end of the switch module, the other end of the upper voltage dividing resistor is connected with one end of the lower voltage dividing resistor, a reference end of the three-terminal shunt regulator is connected with a common connection end of the upper voltage dividing resistor and the lower voltage dividing resistor, the other end of the lower voltage dividing resistor is grounded with the anode of the three-terminal shunt regulator, and the upper voltage dividing resistor is used for controlling voltage at the reference end of the three-terminal shunt regulator.
8. A battery power display device is characterized by comprising the battery power display circuit, a circuit board, a light guide column, a glue layer, a panel and a lead wire according to any one of claims 1-7, The battery power display circuit is arranged on the circuit board, the glue layer and the panel are sequentially arranged above the battery power display circuit and the circuit board, through holes for accommodating the light emitting diodes of the battery power display circuit are respectively formed in the glue layer and the panel, the light guide column is covered above the light emitting diodes of the battery power display circuit, one end of the lead is electrically connected with the battery power display circuit, and the other end of the lead is detachably connected with a battery to be tested and used for collecting the battery voltage of the battery to be tested.

Description

Battery electric quantity display circuit and battery electric quantity display device Technical Field The present utility model relates to the field of battery power management, and in particular, to a battery power display circuit and a battery power display device. Background The current magnetic particle inspection instrument is generally powered by a lithium battery, and a battery compartment is used for installing a battery, so that the influence of ambient humidity on the working state of the lithium battery is reduced as much as possible, the lithium battery is packaged in the fully-closed battery compartment, and the residual electric quantity of the lithium ion battery in the electric tool is monitored through a battery electric quantity display circuit, so that the use of equipment is facilitated. However, the battery power display circuit is generally controlled by a mechanical switch, and when the user presses the mechanical switch, the battery power display circuit operates, and when the user releases the mechanical switch, the battery power display circuit stops operating. Because the mechanical switch can not carry out full circuit sealing, liquid easily enters the mechanical switch from the gap of the mechanical switch, and the failure rate of a battery electric quantity display circuit of the mechanical switch is improved. Accordingly, the prior art is still in need of improvement and development. Disclosure of utility model In view of the above-mentioned shortcomings of the prior art, the present utility model is directed to a battery power display circuit and a battery power display device, so as to solve the problems of poor waterproof performance and high failure rate of the existing battery power display circuit. The technical scheme of the utility model is as follows: The utility model discloses a battery electric quantity display circuit which comprises a vibration detection module, a delay module, a switch module and a display module, wherein, One end of the vibration detection module is externally connected with battery voltage, the other end of the vibration detection module is grounded, and the vibration detection module is used for outputting a conduction signal when detecting a vibration signal of an external environment; One end of the delay module is respectively connected with the vibration detection module and the battery voltage, the other end of the delay module is grounded, and the delay module is used for outputting a turn-off signal after delaying for a preset time; the power end of the switch module is connected with the battery voltage, the control end of the switch module is connected with the common connection end of the delay module and the vibration detection module, the voltage output end of the switch module is connected with the display module, and the switch module is used for controlling the display module to start working and outputting the battery voltage when receiving the on signal and controlling the display module to stop working when receiving the off signal; The display module is connected with the voltage output end of the switch module and is used for displaying electric quantity information according to the battery voltage. The vibration detection module comprises a vibration switch, a first resistor, a second resistor and a first transistor, wherein one end of the vibration switch is connected with a battery voltage, the other end of the vibration switch is connected with one end of the first resistor, the other end of the first resistor is connected with one end of the second resistor, the other end of the second resistor is grounded, a grid electrode of the first transistor is connected with a common connection end of the first resistor and the second resistor, a source electrode of the first transistor is connected with the time delay module, and a drain electrode of the first transistor is grounded. The utility model further provides that the delay module comprises a fifth resistor and a first capacitor, wherein, One end of the fifth resistor is connected with the control end of the switch module and the vibration detection module respectively, the other end of the fifth resistor is connected with one end of the first capacitor, and the other end of the first capacitor is grounded. The switch module comprises a second transistor, a third resistor and a fourth resistor, wherein the second transistor is a PMOS tube, one end of the third resistor and a source electrode of the second transistor are connected with battery voltage, the other end of the third resistor is connected with one end of the fourth resistor, the other end of the fourth resistor is respectively connected with the vibration detection module and the delay module, a grid electrode of the second transistor is connected with a common connection end of the third resistor and the fourth resistor, and a drain electrode of the second transistor is connected with the display module.