Circuit for preventing rotating lamp from flickering when storage battery is fully charged and charger

Abstract

The utility model discloses a circuit for preventing a conversion lamp from flickering when a storage battery is fully charged and a charger, and relates to the technical field of electric vehicles. The positive input end of the operational amplifier is connected with a reference voltage end; the output end of the operational amplifier is connected with a first pin of the control chip and further connected with the first end of the red light-emitting diode, the second end of the red light-emitting diode is grounded, and the second end of the red light-emitting diode is further connected with the first end of the green light-emitting diode. The second end of the green light-emitting diode is connected with the second pin of the control chip, the second end of the green light-emitting diode is further connected with the positive electrode of the first voltage-regulator tube, and the negative electrode of the first voltage-regulator tube is connected with the auxiliary power supply. In normal charging time, the red light-emitting diode is lightened, the green light-emitting diode is completely reversely biased, and when charging is finished, the red light-emitting diode is reversely biased, and the green light-emitting diode is lightened.

Description

Technical Field

[0001] The utility model relates to the technical field of chargers, in particular to a circuit and a charger for preventing a rotating lamp from flashing when a battery is fully charged. Background Art

[0002] Currently, chargers on the market generally default to turning red when charging and green when fully charged. However, there are chargers that may flash red and green alternately when fully charged, making it difficult for users to determine whether the charger is fully charged. The flashing may be caused by interference to the controller that controls the red light to turn green, or the circuit hardware design is insufficient, resulting in the inability to isolate the light when turning green, unstable battery voltage, and too fast voltage changes when turning red and green, causing the red light to flash back and forth. Utility Model Content

[0003] Based on the above problems, the utility model provides a circuit for preventing the red and green lights from flashing when the battery is fully charged and a charger, so as to avoid the situation that the red and green lights flash alternately back and forth when the charger is fully charged.

[0004] The utility model embodiment discloses the following technical solution:

[0005] In a first aspect, the present application provides a circuit to prevent a battery from flashing when the battery is fully charged, which is used to be arranged at the negative output end of the charger, and includes: an operational amplifier, a control chip, an auxiliary power supply, a first voltage regulator tube, a red light emitting diode, and a green light emitting diode;

[0006] The negative phase input terminal of the operational amplifier is connected to the negative output terminal; the positive input terminal of the operational amplifier is connected to the reference voltage terminal; the output terminal of the operational amplifier is connected to the first pin of the control chip, the output terminal of the operational amplifier is also connected to the first end of the red light-emitting diode, the second end of the red light-emitting diode is grounded, the second end of the red light-emitting diode is also connected to the first end of the green light-emitting diode, the second end of the green light-emitting diode is connected to the second pin of the control chip, the second end of the green light-emitting diode is also connected to the positive electrode of the first voltage regulator tube, and the negative electrode of the first voltage regulator tube is connected to the auxiliary power supply.

[0007] Optionally, the negative phase input terminal of the operational amplifier is connected to the first end of the first resistor group, the second end of the first resistor group is connected to the negative output terminal, the first end of the first resistor group is connected to the first end of the second resistor group, and the second end of the second resistor group is grounded;

[0008] The non-inverting input terminal of the operational amplifier is connected to the first end of the third resistor group, the second end of the third resistor group is connected to the reference voltage terminal, the non-inverting input terminal of the operational amplifier is also connected to the first end of the resistor R1, and the second end of the resistor R1 is grounded.

[0009] Optionally, the control chip is used to receive a low level output by the operational amplifier at the first pin, and control the second pin to output a high level.

[0010] Optionally, the second end of the green light emitting diode is connected to the first end of the resistor R2, and the second end of the resistor R2 is connected to the positive electrode of the first voltage regulator tube.

[0011] Optionally, the second end of the red light emitting diode is connected to the first end of the resistor R3, and the second end of the resistor R3 is grounded.

[0012] Optionally, the output end of the operational amplifier is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the first pin, the second end of the resistor R4 is also connected to the positive electrode of the capacitor C1, the negative electrode of the capacitor C1 is grounded, the negative electrode of the capacitor C1 is also connected to the negative electrode of the second voltage regulator tube, and the positive electrode of the second voltage regulator tube is connected to the first pin.

[0013] Optionally, the first resistor group includes a resistor R11 and a resistor R12 connected in parallel; the second resistor group includes a resistor R13 and a resistor R14 connected in parallel; and the third resistor group includes a resistor R15 and a resistor R16 connected in series.

[0014] Optionally, the auxiliary power supply is also connected to a power supply terminal of the operational amplifier to power the operational amplifier.

[0015] In a second aspect, the present application also provides a charger that uses the above-mentioned circuit to prevent the light from flashing when the battery is fully charged.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model discloses a circuit to prevent the flashing of the light of the battery when it is fully charged and a charger, which is used to be arranged at the negative output end of the charger, and includes: an operational amplifier, a control chip, an auxiliary power supply, a first voltage regulator, a red light emitting diode and a green light emitting diode; the negative phase input end of the operational amplifier is connected to the negative output end; the positive input end of the operational amplifier is connected to the reference voltage end; the output end of the operational amplifier is connected to the first pin of the control chip, the output end of the operational amplifier is also connected to the first end of the red light emitting diode, the second end of the red light emitting diode is grounded, the second end of the red light emitting diode is also connected to the first end of the green light emitting diode, the second end of the green light emitting diode is connected to the second pin of the control chip, the second end of the green light emitting diode is also connected to the positive pole of the first voltage regulator, and the negative pole of the first voltage regulator is connected to the auxiliary power supply. During normal charging time, the output end of the operational amplifier outputs a high level, the red light emitting diode is lit, and the green light emitting diode is completely reverse biased because the green light emitting diode is stepped down from the auxiliary power supply through the first voltage regulator, blocking the green light emitting diode, and only the red light color light emitting diode can be used. When charging is finished, the output of the operational amplifier outputs a low level, and the first pin of the control chip controls the second pin to output a high level according to the low level. The red LED is reverse biased, blocking the red LED, and the green LED lights up. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 The utility model provides a structural schematic diagram of a circuit for preventing a rotating light from flashing when a battery is fully charged.

[0020] Description of Figure Numbers

[0021] 1- operational amplifier; 2- red light emitting diode; 3- green light emitting diode; 4- first voltage regulator; 5- auxiliary power supply; 6- first pin; 7- second pin; 8- second voltage regulator; 9- reference voltage terminal. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] First, see Figure 1 The schematic diagram of the structure of a circuit for preventing the flashing of the light when the battery is fully charged is shown, which is used to be set at the negative output end of the charger, and is characterized in that it includes: an operational amplifier 1, a control chip, an auxiliary power supply 5, a first voltage regulator tube 4, a red light emitting diode 2 and a green light emitting diode 3;

[0024] The negative phase input terminal of the operational amplifier 1 is connected to the negative output terminal; the positive input terminal of the operational amplifier 1 is connected to the reference voltage terminal 9; the output terminal of the operational amplifier 1 is connected to the first pin 6 of the control chip, the output terminal of the operational amplifier 1 is also connected to the first end of the red light-emitting diode 2, the second end of the red light-emitting diode 2 is grounded, the second end of the red light-emitting diode 2 is also connected to the first end of the green light-emitting diode 3, the second end of the green light-emitting diode 3 is connected to the second pin 7 of the control chip, the second end of the green light-emitting diode 3 is also connected to the positive electrode of the first voltage regulator tube 4, and the negative electrode of the first voltage regulator tube 4 is connected to the auxiliary power supply 5.

[0025] Exemplarily, the control chip is used to receive a low level (eg 0V) output by the operational amplifier 1 at the first pin 6 and control the second pin 7 to output a high level (eg 5V).

[0026] Exemplarily, the auxiliary power supply 5 is also connected to a power supply terminal of the operational amplifier 1 for supplying power to the operational amplifier 1 .

[0027] Based on the structure of the circuit for preventing the flashing of the light when the battery is fully charged, during normal charging time, the output end of the operational amplifier 1 outputs a high level (e.g., 12V), the red LED 2 is lit, and the green LED 3 is completely reverse biased because the voltage is stepped down from the auxiliary power supply 5 through the first voltage regulator tube 4 (5.1V), blocking the green LED 3, and only the red LED can be turned on. At the end of charging, the output end of the operational amplifier 1 outputs a low level (e.g., 0V), and the first pin 6 of the control chip controls the second pin 7 to output a high level (e.g., 5V) according to the low level, the red LED 2 is reverse biased, blocking the red LED 2, and the green LED 3 is lit.

[0028] Therefore, the electric charge of the red light emitting diode 2 and the green light emitting diode 3 is complementary, when one is lit, the other will be blocked, which can avoid the situation where the red and green lights flash alternately when the charger is fully charged.

[0029] In a possible implementation, the negative phase input terminal of the operational amplifier 1 is connected to the first end of the first resistor group, the second end of the first resistor group is connected to the negative output terminal, the first end of the first resistor group is connected to the first end of the second resistor group, and the second end of the second resistor group is grounded; the positive phase input terminal of the operational amplifier 1 is connected to the first end of the third resistor group, the second end of the third resistor group is connected to the reference voltage terminal 9, and the positive phase input terminal of the operational amplifier 1 is also connected to the first end of the resistor R1, and the second end of the resistor R1 is grounded.

[0030] Specifically, the first resistor group includes a resistor R11 and a resistor R12 connected in parallel; the second resistor group includes a resistor R13 and a resistor R14 connected in parallel; and the third resistor group includes a resistor R15 and a resistor R16 connected in series.

[0031] Furthermore, the second end of the green light emitting diode 3 is connected to the first end of the resistor R2 , and the second end of the resistor R2 is connected to the positive electrode of the first voltage regulator tube 4 .

[0032] Furthermore, the second end of the red light emitting diode 2 is connected to the first end of the resistor R3, and the second end of the resistor R3 is grounded.

[0033] Furthermore, the output end of the operational amplifier 1 is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the first pin 6, the second end of the resistor R4 is also connected to the positive electrode of the capacitor C1, the negative electrode of the capacitor C1 is grounded, the negative electrode of the capacitor C1 is also connected to the negative electrode of the second voltage regulator tube 8, and the positive electrode of the second voltage regulator tube 8 is connected to the first pin 6.

[0034] Secondly, based on the above Figure 1 The present application also provides a charger which adopts the above-mentioned circuit for preventing the rotating light from flashing when the battery is fully charged.

[0035] Furthermore, a reverse connection protection circuit may be provided at the negative input terminal of the charger.

[0036] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0037] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A circuit to prevent the flashing of the battery indicator light when the battery is fully charged, which is used to be set at the negative output end of the charger, characterized in that: include: Operational amplifier, control chip, auxiliary power supply, first voltage regulator tube, red light emitting diode and green light emitting diode; The negative phase input terminal of the operational amplifier is connected to the negative output terminal; the positive input terminal of the operational amplifier is connected to the reference voltage terminal; the output terminal of the operational amplifier is connected to the first pin of the control chip, the output terminal of the operational amplifier is also connected to the first end of the red light-emitting diode, the second end of the red light-emitting diode is grounded, the second end of the red light-emitting diode is also connected to the first end of the green light-emitting diode, the second end of the green light-emitting diode is connected to the second pin of the control chip, the second end of the green light-emitting diode is also connected to the positive electrode of the first voltage regulator tube, and the negative electrode of the first voltage regulator tube is connected to the auxiliary power supply.

2. The circuit according to claim 1, characterized in that The negative phase input terminal of the operational amplifier is connected to the first end of the first resistor group, the second end of the first resistor group is connected to the negative output terminal, the first end of the first resistor group is connected to the first end of the second resistor group, and the second end of the second resistor group is grounded; The non-inverting input terminal of the operational amplifier is connected to the first end of the third resistor group, the second end of the third resistor group is connected to the reference voltage terminal, the non-inverting input terminal of the operational amplifier is also connected to the first end of the resistor R1, and the second end of the resistor R1 is grounded.

3. The circuit according to claim 1, characterized in that The control chip is used for receiving a low level output by the operational amplifier at the first pin and controlling the second pin to output a high level.

4. The circuit according to claim 1, characterized in that The second end of the green light emitting diode is connected to the first end of the resistor R2, and the second end of the resistor R2 is connected to the positive electrode of the first voltage regulator tube.

5. The circuit according to claim 1, characterized in that The second end of the red light emitting diode is connected to the first end of the resistor R3, and the second end of the resistor R3 is grounded.

6. The circuit according to claim 1, characterized in that The output end of the operational amplifier is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the first pin, the second end of the resistor R4 is also connected to the positive electrode of the capacitor C1, the negative electrode of the capacitor C1 is grounded, the negative electrode of the capacitor C1 is also connected to the negative electrode of the second voltage regulator tube, and the positive electrode of the second voltage regulator tube is connected to the first pin.

7. The circuit according to claim 2, characterized in that The first resistor group includes a resistor R11 and a resistor R12 connected in parallel; the second resistor group includes a resistor R13 and a resistor R14 connected in parallel; and the third resistor group includes a resistor R15 and a resistor R16 connected in series.

8. The circuit according to claim 1, characterized in that The auxiliary power supply is also connected to the power supply terminal of the operational amplifier to supply power to the operational amplifier.

9. A charger, characterized in that: A circuit for preventing a battery light from flashing when the battery is fully charged as described in any one of claims 1 to 8 is used.

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