CN213069106U - Battery voltage detection circuit structure capable of avoiding power consumption - Google Patents
Battery voltage detection circuit structure capable of avoiding power consumption Download PDFInfo
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- CN213069106U CN213069106U CN202021502701.2U CN202021502701U CN213069106U CN 213069106 U CN213069106 U CN 213069106U CN 202021502701 U CN202021502701 U CN 202021502701U CN 213069106 U CN213069106 U CN 213069106U
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Abstract
The utility model discloses a can avoid power consumptive battery voltage detection circuit structure belongs to battery voltage detection technical field, include: a battery voltage signal is electrified and switched on to turn on a power-down turn-off circuit; a power-up circuit is avoided; a voltage follower circuit; a voltage dividing circuit; and a signal output terminal. The battery is connected with the battery voltage signal power-on power-off turn-off circuit, the battery voltage signal power-on power-off turn-off circuit is respectively connected with the power-on power consumption avoiding circuit and the voltage following circuit, the power-on power consumption avoiding circuit is connected with the voltage following circuit, the voltage following circuit is connected with the voltage dividing circuit, and the voltage dividing circuit is connected with the signal output end. Whether the electric quantity of the battery is about to be used up can be judged by detecting the voltage value of the battery, and meanwhile, the electric quantity of the battery can be prevented from being consumed.
Description
Technical Field
The utility model belongs to the technical field of battery voltage detects, concretely relates to can avoid power consumptive battery voltage detection circuit structure for non-chargeable type button lithium manganese battery.
Background
The non-charging button lithium manganese battery, called button battery or battery for short, is generally used for supplying power to micro-power consumption circuits such as a real-time clock, and the like, and has the advantages of low self-attenuation of battery power and long power supply time. However, when the amount of power is close to being used up, the power supply circuit may operate unstably, such as inaccurate timing of the real-time clock circuit. In this case, if the battery voltage can be detected, the actual power condition of the battery can be grasped, and the current general voltage detection circuit has the problem of consuming the battery power, so that the power supply time of the battery is greatly shortened, and therefore, a battery voltage detection circuit which does not consume power is required.
SUMMERY OF THE UTILITY MODEL
For solving exist not enough among the prior art, the utility model provides a can avoid power consumptive battery voltage detection circuit structure can judge whether the electric quantity of battery is about to run out through detecting battery voltage value, can avoid consuming battery power simultaneously.
The utility model discloses a solve the technical scheme that its technical problem adopted and be: a battery voltage detection circuit structure capable of avoiding power consumption includes:
the power-on and power-off switching-off circuit is used for transmitting a battery voltage signal to the voltage follower circuit during power-on and blocking the battery from the power-on power-off circuit and the voltage follower circuit during power-off;
a power-up circuit is avoided;
the voltage follower circuit is used for impedance conversion and low-impedance output;
the voltage division circuit is used for dividing the voltage signal of the battery and reducing the voltage value;
a signal output terminal;
the battery is connected with the battery voltage signal power-on power-off turn-off circuit, the battery voltage signal power-on power-off turn-off circuit is respectively connected with the power-on power consumption avoiding circuit and the voltage following circuit, the power-on power consumption avoiding circuit is connected with the voltage following circuit, the voltage following circuit is connected with the voltage dividing circuit, and the voltage dividing circuit is connected with the signal output end.
The power-on and power-off turn-off circuit of the battery voltage signal comprises a resistor R96, an NMOS transistor, a resistor R301, a resistor R303 and a DC 5V power supply, wherein one end of the resistor R96 is connected with the positive electrode of the battery, the other end of the resistor R96 is connected with the drain electrode of the NMOS transistor, the grid electrode of the NMOS transistor is respectively connected with one ends of the resistor R303 and the resistor R301, the other end of the resistor R303 is connected with a power ground, the other end of the resistor R301 is connected with the DC 5V power supply, and the source electrode of the NMOS transistor is connected with the input end of a voltage following circuit and a.
The power-on electricity consumption avoiding circuit comprises a resistor R302 and a DC 5V power supply, wherein one end of the resistor R302 is connected with the input end of the voltage follower circuit, and the other end of the resistor R302 is connected with the DC 5V power supply.
The voltage follower circuit is an operational amplifier, the positive input end of the operational amplifier is connected with the source electrode of the NMOS transistor and one end of the resistor R302, and the negative input end of the operational amplifier is connected with the output end.
The voltage division circuit comprises a resistor R101, a resistor R102 and a capacitor C301, wherein the resistor R101 and the resistor R102 are connected in series, and two ends of the formed series circuit are respectively connected with the output end of the operational amplifier and the power ground; the junction of the resistor R101 and the resistor R102 is connected with the signal output end, and a capacitor C301 is connected between the signal output end and the power ground.
The junction of the resistor R101 and the resistor R102 is the output end of the voltage division circuit, and the voltage division coefficient a is as follows:
the utility model has the advantages that: 1. the voltage of the non-charging button-shaped lithium manganese battery is detected, so that whether the electric quantity of the battery is about to be used up is judged;
2. the consumption of the detection circuit to the electric quantity of the non-charging button-shaped lithium manganese battery is avoided.
Drawings
FIG. 1 is a block diagram of the overall structure of the present invention;
fig. 2 is a connection diagram of the whole structure of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Example 1
A battery voltage detection circuit structure capable of avoiding power consumption, which is mainly used for detecting the voltage of a non-charging button-shaped lithium manganese battery U23, and comprises: the power-on circuit comprises a battery voltage signal power-on power-off turn-off circuit, a power-on power-consumption-avoiding circuit, a voltage following circuit, a voltage division circuit and a signal output end.
Description of Power Up and Power Down:
the utility model discloses circuit structure uses in various circuit system (such as computer motherboard, multimedia device, industrial controller) as a functional module, "power on" indicates that circuit system has an electric operating condition, "power down" indicates that circuit system does not have electric off-working condition. A DC 5V power supply is included in the circuitry.
The power-on and power-down turn-off circuit of the battery voltage signal:
the partial circuit has the functions of transmitting a battery voltage signal to the voltage following circuit during power-on and isolating the battery from other circuits during power-off so as to avoid power consumption of the battery. The partial circuit comprises a 4.7K ohm resistor (code R96), an NMOS transistor Q301, two 10K ohm resistors (R301 and R303) and a DC 5V power supply. One end of the resistor R96 is connected with the anode of the battery, and the other end is connected with the drain electrode of the NMOS transistor Q301; the grid electrode of the NMOS transistor Q301 is respectively connected with one ends of the resistors R303 and R301, the other end of the resistor R303 is connected with the power ground, and the other end of the resistor R301 is connected with the DC 5V power supply; the source of the NMOS transistor Q301 is connected as the output terminal of the present circuit to the input terminal of the voltage follower circuit and the power-up power consumption avoiding circuit.
Power-up power-consumption avoiding circuit:
this partial circuit comprises an ohmic resistance R302 of 1M, and the one end of this resistance links to each other with the voltage follower circuit input, and the other end links to each other with the DC 5V power, because resistance R302's pull-up effect during the electricity-on for the voltage value of voltage follower circuit input is higher than battery voltage value slightly, the utility model discloses circuit structure does not consume the battery power, again because resistance R302 resistance is great, makes the voltage value of voltage follower circuit input be close to battery voltage value, can ensure not to influence the accuracy that battery voltage detected.
A voltage follower circuit:
is formed by an operational amplifier U16B for impedance conversion to avoid consuming battery power while forming a low impedance output. The positive input end of pin 5 of the operational amplifier U16B is the input end of the partial circuit, and the negative input end of pin 6 of the operational amplifier U16B is connected with the output end of pin 7, which is the output end of the partial circuit.
A voltage dividing circuit:
the voltage divider is used for dividing the voltage signal of the battery and reducing the voltage value, so that the output voltage signal can be detected by an analog-digital converter (ADC) of the circuit system. The circuit comprises two resistors R101 and R102 and a capacitor C301, wherein the resistors R101 and R102 are connected in series, and two ends of the formed series circuit are respectively connected with the output end of the voltage follower circuit and the power ground. The connection part of the resistors R101 and R102 is the output end of the partial circuit, the output end is connected with a lead, the other end of the lead is used as a signal output end ADC-IN, a capacitor C301 is connected between the signal output end ADC-IN and a power ground, and the capacitor C301 is used for filtering the interference of a circuit system to the circuit structure. The signal output end ADC-IN is connected to the ADC input end of the circuit system where the signal output end ADC-IN is located, the ADC can measure a voltage value, and the voltage value is divided by a voltage division coefficient of the voltage division circuit to obtain the battery voltage. The partial pressure coefficient a is:
preferably, the resistor R101 has a resistance of 4.7K ohms, the resistor R102 has a resistance of 10K ohms, and the capacitor C301 has a capacitance of 47 nF.
The battery U23 is a non-charging button type lithium manganese battery, the positive electrode of the battery is connected with one end of a resistor R96, and the negative electrode of the battery is connected with the power ground.
The above connection structure is summarized and explained: the resistor R96 has one end connected to the positive electrode of the battery and the other end connected to the drain of the NMOS transistor Q301. The gate of the NMOS transistor Q301 is connected to one end of the resistors R303 and R301, respectively, the other end of the resistor R303 is connected to the power ground, and the other end of the resistor R301 is connected to the DC 5V power supply. The source of the NMOS transistor Q301 is the output of the power-on/power-off circuit for the battery voltage signal, which is connected to the input of the voltage follower circuit, i.e., pin 5 of the operational amplifier U16B. One end of a resistor R302 of the power-up power-consumption avoiding circuit is connected with DC 5V, and the other end of the resistor R302 is connected with the input end of the voltage follower circuit, namely a pin 5 of the operational amplifier U16B. The positive input terminal 5 of the operational amplifier U16B is the input terminal of the voltage follower circuit, and the voltage at the input terminal is V301, which is approximately equal to the battery voltage V-BAT. The negative input terminal 6 of the operational amplifier U16B is connected to the output terminal 7 to form the output terminal of the voltage follower circuit. The supply voltage of the operational amplifier U16B is DC 5V. The resistor R101 of the voltage division circuit is connected in series with the resistor R102, the other end of the resistor R101 is connected with the output end of the voltage follower circuit, namely the pins 6 and 7 of the operational amplifier U16B, and the other end of the resistor R102 is connected with the power ground. The junction of the resistors R101 and R102 is the output end of the voltage divider circuit, the output end is connected to the conducting wire as the signal output end ADC-IN of this embodiment, the signal output end ADC-IN is connected to the ADC of the circuit system where it is located, and a capacitor C301 is connected between the signal output end ADC-IN and the power ground.
It should be noted that, in the present embodiment, the selection of specific components and models is only the best mode of the invention, not the only one, and should not be taken as a condition for limiting the scope of the invention.
The above description is only the specific implementation manner of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the design of the present invention within the technical scope of the present invention.
Claims (6)
1. A battery voltage detection circuit structure capable of avoiding power consumption, comprising:
the power-on and power-off switching-off circuit is used for transmitting a battery voltage signal to the voltage follower circuit during power-on and blocking the battery from the power-on power-off circuit and the voltage follower circuit during power-off;
a power-up circuit is avoided;
the voltage follower circuit is used for impedance conversion and low-impedance output;
the voltage division circuit is used for dividing the voltage signal of the battery and reducing the voltage value;
a signal output terminal;
the battery is connected with the battery voltage signal power-on power-off turn-off circuit, the battery voltage signal power-on power-off turn-off circuit is respectively connected with the power-on power consumption avoiding circuit and the voltage following circuit, the power-on power consumption avoiding circuit is connected with the voltage following circuit, the voltage following circuit is connected with the voltage dividing circuit, and the voltage dividing circuit is connected with the signal output end.
2. The circuit structure of claim 1, wherein the power-on/power-off switch circuit of the battery voltage signal comprises a resistor R96, an NMOS transistor, a resistor R301, a resistor R303, and a DC 5V power supply, wherein one end of the resistor R96 is connected to the positive electrode of the battery, the other end of the resistor R96 is connected to the drain of the NMOS transistor, the gate of the NMOS transistor is connected to one end of the resistor R303 and one end of the resistor R301, the other end of the resistor R303 is connected to the ground, the other end of the resistor R301 is connected to the DC 5V power supply, and the source of the NMOS transistor is connected to the input terminal of the voltage follower circuit and the power-on/power-off circuit.
3. The battery voltage detection circuit structure capable of avoiding power consumption as claimed in claim 1, wherein the power-up power consumption avoiding circuit comprises a resistor R302 and a DC 5V power supply, wherein one end of the resistor R302 is connected to the input end of the voltage follower circuit, and the other end is connected to the DC 5V power supply.
4. The battery voltage detection circuit structure of claim 1, wherein the voltage follower circuit is an operational amplifier, the positive input terminal of the operational amplifier is connected to the source of the NMOS transistor and one terminal of the resistor R302, and the negative input terminal of the operational amplifier is connected to the output terminal.
5. The battery voltage detection circuit structure capable of avoiding power consumption as claimed in claim 1, wherein the voltage divider circuit comprises a resistor R101, a resistor R102, and a capacitor C301, wherein the resistor R101 and the resistor R102 are connected in series to form a series circuit, and two ends of the series circuit are respectively connected to the output end of the operational amplifier and the power ground; the junction of the resistor R101 and the resistor R102 is connected with the signal output end, and a capacitor C301 is connected between the signal output end and the power ground.
6. The battery voltage detection circuit structure capable of avoiding power consumption according to claim 5, wherein the connection point of the resistor R101 and the resistor R102 is the output end of the voltage division circuit, and the voltage division coefficient a is:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021502701.2U CN213069106U (en) | 2020-07-27 | 2020-07-27 | Battery voltage detection circuit structure capable of avoiding power consumption |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021502701.2U CN213069106U (en) | 2020-07-27 | 2020-07-27 | Battery voltage detection circuit structure capable of avoiding power consumption |
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| CN213069106U true CN213069106U (en) | 2021-04-27 |
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| CN202021502701.2U Active CN213069106U (en) | 2020-07-27 | 2020-07-27 | Battery voltage detection circuit structure capable of avoiding power consumption |
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