CN212514922U - Low-cost electric quantity full-charge indicating circuit - Google Patents
Low-cost electric quantity full-charge indicating circuit Download PDFInfo
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- CN212514922U CN212514922U CN202020677884.5U CN202020677884U CN212514922U CN 212514922 U CN212514922 U CN 212514922U CN 202020677884 U CN202020677884 U CN 202020677884U CN 212514922 U CN212514922 U CN 212514922U
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- emitting diode
- current limiting
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Abstract
The utility model discloses a low-cost full of electric quantity indicating circuit is provided with power input CN1, power output CN2 and operational amplifier U2, detection resistance RS1, first current limiting resistance R2, second current limiting resistance R9, biasing resistance R3 and double-colored emitting diode, and double-colored emitting diode is provided with first emitting diode LED1 and second emitting diode LED 2; the power input end CN1 is connected with the detection resistor RS1 and the first current limiting resistor R2 in series in turn and is connected with the inverting input end of the operational amplifier U2; the power input terminal CN1 is connected to the non-inverting input terminal of the operational amplifier U2 via the second current limiting resistor R9; the power input terminal CN1 is connected to the power supply terminal of the operational amplifier U2 via the bias resistor R3. The utility model discloses need not to use triode drive double-colored emitting diode, simplify circuit structure, reduce the overall arrangement space of circuit board and reduce the cost.
Description
Technical Field
The utility model belongs to the technical field of the LED lamp drive circuit technique and specifically relates to a low-cost electric quantity is full of indicating circuit is related to.
Background
In a general common electric quantity full-charge indicating circuit, an operational amplifier circuit monitors or samples the output current of a charging circuit in real time and compares the output current with an internal preset reference current, and when the output current is greater than the reference current, an indicator lamp lights a red light, otherwise, when the output current is less than the reference current, the indicator lamp lights a green light, so as to indirectly prompt the use state of a user charger.
The light-turning circuit usually adopts a circuit formed by combining an operational amplifier and a triode to control a light-emitting diode, when the electric quantity is full of critical points, the turn-off delay of the triode can cause the state that a red light and a green light are on together, or the state that an indicator light slightly flashes at a certain state of current, which produces a bad effect on the vision of a product, causes the reduction of the user experience, and has the risk of possible repair, so that the improvement is necessary.
Secondly, the circuit structure of the operational amplifier combined with the triode needs to set proper bias voltage for the triode, the whole circuit structure is complex, and the manufacturing cost is correspondingly high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a low-cost and simple structure's electric quantity is full of indicating circuit to the not enough of prior art existence.
In order to realize the purpose, the utility model discloses the technical scheme who adopts is: a low-cost full charge indicating circuit is provided with a power supply input end CN1 and a power supply output end CN2 for connecting electric equipment, and is characterized in that: the LED detection circuit comprises an operational amplifier U2, a detection resistor RS1, a first current limiting resistor R2, a second current limiting resistor R9, a bias resistor R3 and a bicolor LED, wherein the bicolor LED is provided with a first LED1 and a second LED 2;
the power input end CN1 is sequentially connected in series with the detection resistor RS1 and the first current limiting resistor R2 to the inverting input end of the operational amplifier U2, so as to detect the input voltage inputted by the power input end CN 1;
the power input CN1 is connected to the non-inverting input of the operational amplifier U2 through the second current limiting resistor R9 for providing a reference voltage for the operational amplifier U2;
the power input terminal CN1 is connected to the power supply terminal of the operational amplifier U2 through the bias resistor R3, and is used for providing a power-on voltage for the operational amplifier U2;
the anode of the first light emitting diode LED1 is connected to the power input CN1, the cathode is connected to the output terminal of the operational amplifier U2, and the anode of the second light emitting diode LED2 is connected to the output terminal of the operational amplifier U2, and the cathode is connected to the ground.
In a further technical scheme, the electric quantity full-charge indicating circuit is further provided with a voltage dividing circuit, the voltage dividing circuit is provided with a third current limiting resistor R9, a voltage drop diode D1, a first voltage dividing resistor R1 and a second voltage dividing resistor R5, one end of the third current limiting resistor R9 is connected to the power input end CN1, the other end of the third current limiting resistor R9 is respectively connected with the voltage drop diode D1 and the first voltage dividing resistor R1 in parallel, the first voltage dividing resistor R1 is connected in parallel, and the second voltage dividing resistor R5 is connected to the non-inverting input end of the operational amplifier U2.
In a further technical scheme, an RC series circuit is arranged between the output end of the operational amplifier U2 and the non-inverting input end thereof.
In a further technical scheme, the bicolor light-emitting diode is an electrodeless bicolor light-emitting diode.
In a further technical solution, a fourth current limiting resistor R14 is disposed between the anode of the first light emitting diode LED1 and the power input terminal CN1, and a fifth current limiting resistor R15 is disposed between the cathode of the second light emitting diode LED2 and the ground terminal.
After the structure is adopted, compared with the prior art, the utility model the advantage that has is: the utility model discloses the input voltage of rational utilization power input end input, if direct power input end is the power supply of operational amplifier U2 for the high level of operational amplifier U2 output can the double-colored emitting diode of direct drive, need not to use the double-colored emitting diode of triode drive, simplifies circuit structure, reduces the overall arrangement space of circuit board and reduces the cost. Preferably, the bicolor light-emitting diode is an electrodeless bicolor light-emitting diode, and the working power consumption of the bicolor light-emitting diode is low.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The following are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, the utility model provides a low-cost full of electric quantity indicating circuit is provided with power input end CN1 and power supply output end CN2 that is used for connecting consumer, and it includes operational amplifier U2, detection resistance RS1, first current limiting resistance R2, second current limiting resistance R9, biasing resistance R3 and a bicolor light emitting diode, and the bicolor light emitting diode is provided with first light emitting diode LED1 and second light emitting diode LED 2; the power input end CN1 is sequentially connected in series with the detection resistor RS1 and the first current limiting resistor R2 to the inverting input end of the operational amplifier U2, so as to detect the input voltage inputted by the power input end CN 1; the power input CN1 is connected to the non-inverting input of the operational amplifier U2 through the second current limiting resistor R9 for providing a reference voltage for the operational amplifier U2; the power input terminal CN1 is connected to the power supply terminal of the operational amplifier U2 through the bias resistor R3, and is used for providing a power-on voltage for the operational amplifier U2; the anode of the first light emitting diode LED1 is connected to the power input CN1, the cathode is connected to the output terminal of the operational amplifier U2, and the anode of the second light emitting diode LED2 is connected to the output terminal of the operational amplifier U2, and the cathode is connected to the ground.
In practical applications, when an external current is input from the power input terminal CN1 and the power supply output terminal CN2 is connected to a powered device or a powered device, the detection resistor RS1 generates a voltage drop and inputs the voltage drop to the inverting input terminal of the operational amplifier U2, when the voltage drop input by the inverting input terminal is greater than the reference voltage of the non-inverting input terminal, the output terminal of the operational amplifier U2 outputs a low level, the first light emitting diode LED1 is turned on, and the second light emitting diode LED2 is turned off to indicate that the circuit is charging in progress, and when the voltage drop input by the inverting input terminal is less than the reference voltage of the non-inverting input terminal, the first light emitting diode LED1 is turned off, and the second light emitting diode LED2 is turned on to indicate that the battery is. The utility model discloses the input voltage of rational utilization power input end input, if direct power input end is the power supply of operational amplifier U2 for the high level of operational amplifier U2 output can the double-colored emitting diode of direct drive, need not to use the double-colored emitting diode of triode drive, simplifies circuit structure, reduces the overall arrangement space of circuit board and reduces the cost. Preferably, the bicolor light-emitting diode is an electrodeless bicolor light-emitting diode, and the working power consumption of the bicolor light-emitting diode is low.
In a preferred embodiment, the full charge indication circuit further includes a voltage divider circuit, the voltage divider circuit includes a third current limiting resistor R9, a voltage drop diode D1, a first voltage dividing resistor R1, and a second voltage dividing resistor R5, one end of the third current limiting resistor R9 is connected to the power input CN1, the other end of the third current limiting resistor R9 is connected in parallel to the voltage drop diode D1 and the first voltage dividing resistor R1, the first voltage dividing resistor R1 is connected in parallel, and the second voltage dividing resistor R5 is connected to the non-inverting input terminal of the operational amplifier U2. In practical applications, a voltage input from the power input CN1 is limited by the third current limiting resistor R9, then generates a reference voltage drop of 0.7V by the voltage drop diode D1, and then is divided by the R1 and the R5 and input to the non-inverting input terminal of the operational amplifier U2, so as to be used as a reference voltage of the operational amplifier U2.
In a more specific embodiment, an RC series circuit is disposed between the output terminal and the non-inverting input terminal of the operational amplifier U2, and the RC series circuit plays roles of negative feedback and frequency compensation.
In a preferred embodiment, a fourth current-limiting resistor R14 is disposed between the anode of the first light-emitting diode LED1 and the power input terminal CN1, a fifth current-limiting resistor R15 is disposed between the cathode of the second light-emitting diode LED2 and the ground terminal, and both the fourth current-limiting resistor R14 and the fifth current-limiting resistor R15 function as current-limiting protection lamps.
The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.
Claims (5)
1. A low-cost full charge indicating circuit is provided with a power supply input end CN1 and a power supply output end CN2 for connecting electric equipment, and is characterized in that: the LED detection circuit comprises an operational amplifier U2, a detection resistor RS1, a first current limiting resistor R2, a second current limiting resistor R9, a bias resistor R3 and a bicolor LED, wherein the bicolor LED is provided with a first LED1 and a second LED 2;
the power input end CN1 is sequentially connected in series with the detection resistor RS1 and the first current limiting resistor R2 to the inverting input end of the operational amplifier U2, so as to detect the input voltage inputted by the power input end CN 1;
the power input CN1 is connected to the non-inverting input of the operational amplifier U2 through the second current limiting resistor R9 for providing a reference voltage for the operational amplifier U2;
the power input terminal CN1 is connected to the power supply terminal of the operational amplifier U2 through the bias resistor R3, and is used for providing a power-on voltage for the operational amplifier U2;
the anode of the first light emitting diode LED1 is connected to the power input CN1, the cathode is connected to the output terminal of the operational amplifier U2, and the anode of the second light emitting diode LED2 is connected to the output terminal of the operational amplifier U2, and the cathode is connected to the ground.
2. A low cost charge level indicator circuit according to claim 1, wherein: the electric quantity full indicating circuit is further provided with a voltage dividing circuit, the voltage dividing circuit is provided with a third current limiting resistor R9, a voltage dropping diode D1, a first voltage dividing resistor R1 and a second voltage dividing resistor R5, one end of the third current limiting resistor R9 is connected to a power supply input end CN1, the other end of the third current limiting resistor R9 is respectively connected with the voltage dropping diode D1 and the first voltage dividing resistor R1 in parallel, and the first voltage dividing resistor R1 is connected in parallel and the second voltage dividing resistor R5 is connected to a non-inverting input end of an operational amplifier U2.
3. A low cost charge level indicator circuit according to claim 1, wherein: an RC series circuit is arranged between the output end of the operational amplifier U2 and the non-inverting input end thereof.
4. A low cost charge level indicator circuit according to claim 1, wherein: the bicolor light-emitting diode is an electrodeless bicolor light-emitting diode.
5. A low cost charge level indicator circuit according to claim 1, wherein: a fourth current limiting resistor R14 is disposed between the anode of the first light emitting diode LED1 and the power input end CN1, and a fifth current limiting resistor R15 is disposed between the cathode of the second light emitting diode LED2 and the ground end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020677884.5U CN212514922U (en) | 2020-04-28 | 2020-04-28 | Low-cost electric quantity full-charge indicating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020677884.5U CN212514922U (en) | 2020-04-28 | 2020-04-28 | Low-cost electric quantity full-charge indicating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212514922U true CN212514922U (en) | 2021-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020677884.5U Active CN212514922U (en) | 2020-04-28 | 2020-04-28 | Low-cost electric quantity full-charge indicating circuit |
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| Country | Link |
|---|---|
| CN (1) | CN212514922U (en) |
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2020
- 2020-04-28 CN CN202020677884.5U patent/CN212514922U/en active Active
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