CN205193244U - Battery observation circuit and system - Google Patents

Abstract

The utility model discloses a battery monitoring circuit and system, wherein the monitoring circuit comprises: a voltage dividing resistor used for parallel connection with the battery, one end of the voltage dividing resistor is connected to the positive pole of the battery, and the other end of the voltage dividing resistor is connected to the negative pole of the battery; a comparator , used to obtain the voltage of the voltage dividing resistor, the input terminal of the comparator is connected to the voltage dividing resistor; the digital logic module is connected to the output terminal of the comparator, and used to obtain the battery power according to the output of the comparator. Through the above method, the monitoring circuit of the utility model is powered by the battery, realizes collecting the battery voltage to judge the power and the power-on voltage, avoids interfering with the sampling voltage, improves the sampling accuracy, protects the battery function, and the system power consumption is small, with a simple circuit Realize the monitoring of the battery power voltage and reduce the cost.

Description

Battery monitoring circuit and system

technical field

The utility model relates to battery power supply, in particular to a battery monitoring circuit and system.

Background technique

In battery-powered electric tools, in order to protect the battery and facilitate use, it is necessary to monitor the voltage of the power supply battery and display the power and provide battery undervoltage protection. As shown in Figure 1, the battery monitoring circuit in the prior art includes: a switch 11, a first voltage dividing resistor R1, a second voltage dividing resistor R2, an analog-to-digital converter 12, a processor 13 and an alarm 14; the first voltage dividing The resistor R1 and the second voltage dividing resistor R2 are connected in series, the first voltage dividing resistor R1 and the second voltage dividing resistor R2 are connected in parallel with the battery 15, one end of the switch 11 is connected to the positive pole of the battery 15, and the other end of the switch 11 is respectively connected to the second voltage dividing resistor R2. A voltage-dividing resistor R1, a digital-to-analog converter 12 and a processor 13 are connected, and the digital-to-analog converter 12 is connected between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 for collecting battery 15 voltage, and the processor 13 Connected with the digital-to-analog converter 12, the alarm 14 is connected with the processor 13; when the processor 13 judges that the battery voltage is too low, the processor 13 controls the alarm 14 to alarm, and the power tool stops working to protect the battery 15 from discharging.

However, the battery monitoring circuit of the prior art needs to turn on the processor 13 and the digital-to-analog converter 12 when collecting the battery voltage. When the switch 11 is turned on, the current generated by the processor 13 and the digital-to-analog converter 12 will make the battery A voltage drop is generated, which further affects the accuracy of voltage collection and power judgment of the battery 15 .

Utility model content

The utility model provides a battery monitoring circuit and system to solve the above problems.

In order to solve the above problems, the first technical solution adopted by the utility model is to provide a battery monitoring circuit, including: a voltage divider resistor for parallel connection with the battery, one end of the voltage divider resistor is connected to the positive pole of the battery, and the voltage divider resistor The other end is connected to the negative pole of the battery; the comparator is used to obtain the voltage of the voltage dividing resistor, and the input terminal of the comparator is connected to the voltage dividing resistor; the digital logic module is connected to the output terminal of the comparator to obtain the voltage according to the output of the comparator. battery charge.

Wherein, the digital logic module compares the electric quantity with the preset first threshold, and converts the comparison result into a digital signal.

Wherein, the circuit also includes: a clock module, connected with the digital logic module, used to drive the digital logic module to turn on the comparator every preset time; a first switch, used to connect the battery and an external motor; a switch detection module, respectively connected to the The first switch is connected to the digital logic module for detecting the state of the first switch.

Wherein, when the first switch is turned on, if the power is less than the first threshold, the digital logic module controls the first switch to turn off; if the power is greater than or equal to the first threshold, the motor works normally, and the digital logic module also passes the comparator and The voltage dividing resistor obtains the voltage of the battery, and compares the voltage with a preset undervoltage threshold; if the voltage is less than the undervoltage threshold, the digital logic module controls the first switch to be turned off, and the motor stops working.

Wherein, the circuit also includes an alarm module connected to the digital logic module, and the digital logic module controls the alarm module to turn on when the power is less than the first threshold or the voltage is less than the undervoltage threshold.

Wherein, the voltage dividing resistor includes a first resistor and a second resistor connected in series, and the first resistor is connected to the second resistor through a second switch.

In order to solve the above problems, another technical solution adopted by the utility model is to provide a battery monitoring system, including a battery and a battery monitoring circuit, the battery monitoring circuit is used to monitor the battery; the battery monitoring circuit includes: a voltage dividing resistor for The batteries are connected in parallel, one end of the voltage dividing resistor is connected to the positive pole of the battery, and the other end of the voltage dividing resistor is connected to the negative pole of the battery; the comparator is used to obtain the voltage of the voltage dividing resistor, and the input terminal of the comparator is connected to the voltage dividing resistor; the digital logic module , which is connected with the output terminal of the comparator, and is used to obtain the electric quantity of the battery according to the output of the comparator.

Wherein, the digital logic module compares the electric quantity with the preset first threshold, and converts the comparison result into a digital signal.

Wherein, the circuit also includes: a clock module, connected with the digital logic module, used to drive the digital logic module to turn on the comparator every preset time; a first switch, used to connect the battery and an external motor; a switch detection module, respectively connected to the The first switch is connected to the digital logic module for detecting the state of the first switch.

Wherein, when the first switch is turned on, if the power is less than the first threshold, the digital logic module controls the first switch to turn off; if the power is greater than or equal to the first threshold, the motor works normally, and the digital logic module also passes the comparator and The voltage dividing resistor obtains the voltage of the battery; if the voltage is lower than the undervoltage threshold, the digital logic module controls the first switch to be turned off, and the motor stops working.

Through the above scheme, the beneficial effect of the utility model is: different from the prior art, the battery monitoring circuit of the utility model includes: a voltage dividing resistor, used for parallel connection with the battery, one end of the voltage dividing resistor is connected to the positive pole of the battery, and the voltage dividing resistor The other end of the battery is connected to the negative pole of the battery; the comparator is used to obtain the voltage of the voltage divider resistor, and the input terminal of the comparator is connected to the voltage divider resistor; the digital logic module is connected to the output terminal of the comparator for The output of the utility model obtains the power of the battery, so that the monitoring circuit of the utility model is always powered by the battery, avoiding interference with the sampling voltage, realizing the collection of the battery voltage to judge the power and the power-on voltage, improving the sampling accuracy, protecting the battery function, and the system power consumption is small , realize the monitoring of the battery power voltage with a simple circuit, and reduce the cost.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. For example, those of ordinary skill in the art can also obtain other drawings based on these drawings on the premise of not paying creative efforts. in:

FIG. 1 is a schematic diagram of a circuit structure of a battery monitoring circuit in the prior art;

FIG. 2 is a schematic structural diagram of a battery monitoring circuit according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. . Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

Please refer to FIG. 2 , which is a schematic structural diagram of a battery monitoring circuit according to an embodiment of the present invention. As shown in FIG. 2 , the battery monitoring circuit 1 disclosed in this embodiment includes: a voltage dividing resistor 21 , a comparator 22 , a digital logic module 23 , a clock module 24 , a first switch 25 , a second switch 26 , and a switch detection module 27 As well as the alarm module 28, the battery monitoring circuit 1 is used to monitor the power and voltage of the battery 29, the battery 29 is used to supply power to the external motor 30, and the battery 29 is preferably a battery pack or a battery pack.

Wherein, the voltage dividing resistor 21 is used for parallel connection with the battery 29 , one end of the voltage dividing resistor 21 is connected to the positive pole of the battery 28 , and the other end of the voltage dividing resistor 21 is connected to the negative pole of the battery 29 . Preferably, the voltage dividing resistor 21 includes a first resistor 211 and a second resistor 212 connected in series, and the first resistor 211 is connected to the second resistor 212 through the second switch 26 .

The comparator 22 is used to obtain the voltage of the voltage dividing resistor 21, and the input terminal of the comparator 22 is connected with the voltage dividing resistor 21, that is, the input terminal of the comparator 22 is connected between the first resistor 211 and the second resistor 212; preferably , the negative input terminal of the comparator 22 is connected between the first resistor 211 and the second resistor 212, the positive input terminal of the comparator 22 is used to input the first reference voltage, so as to compare the voltage of the voltage dividing resistor 21 with the first reference voltage Compare.

The digital logic module 23 is connected with the comparator 22, the clock module 24, the switch detection module 27 and the alarm module 28 respectively, and the digital logic module 23 is connected with the output terminal of the comparator 22, and is used to obtain the electric quantity of the battery 29 according to the output of the comparator 22 , that is, the digital logic module 23 obtains the electric quantity of the battery 29 according to the comparison result; the digital logic module 23 also obtains the voltage V1 of the battery 29 through the voltage dividing resistor 21 and the comparator 22 .

The first switch 25 is used to connect the battery 29 and the external motor 30 . The switch detection module 27 is connected to the first switch 25 for detecting the state of the first switch 25 . The first switch 25 is a mechanical switch. The clock module 24 is used to drive the digital logic module 23 to turn on the comparator 22 every preset time, that is, the clock module 24 wakes up (turns on) the digital logic module 23 and the comparator 22 every preset time, for example, the clock module 24 activates the comparator 22 every preset time. The digital logic module 23 and the comparator 22 are driven on for 1 millisecond every 2 seconds.

The digital logic module 23 is also used to control the alarm module 28 to turn on, and the alarm module 28 is preferably lit or displayed on the screen. In addition, the comparator 22 , the digital logic module 23 , the clock module 24 and the alarm module 28 are powered by the battery 29 and are not affected by the states of the first switch 25 and the second switch 26 .

In this embodiment, a comparator 22 is set in the battery monitoring circuit 1, and the comparator 22 is preferably a voltage comparator. The digital logic module 23 controls the comparator 22 to compare with different thresholds, so as to know the battery voltage of the battery 29 scope. In other embodiments, multiple comparators 22 with different thresholds can also be set in the battery monitoring circuit 1 , and the digital logic module 23 is used to control the opening and closing of multiple comparators 22 to obtain the battery voltage range of the battery 29 .

The working principle of the battery monitoring circuit 1 disclosed in this embodiment is described in detail below:

When the switch detection module 27 detects that the first switch 25 is in the off state, the motor 30 is in the standby state, and the clock module 24 drives the digital logic module 23 to turn on the comparator 22 every preset time, and simultaneously when the comparator 22 is turned on Control the second switch 26 to be turned on, for example, the clock module 24 drives the digital logic module 23 to open for 1 millisecond every 2 seconds, and the corresponding second switch 26 is also opened for 1 millisecond every 2 seconds, and the digital logic module 23 obtains the comparator 22 The outputted comparison result, the digital logic module 23 obtains the electric quantity of the battery 29 according to the comparison result, compares the electric quantity with the preset first threshold, and converts the comparison result into a digital signal, so as to latch the comparison result as a digital signal.

When the switch detection module 27 detects that the first switch 25 is turned on, the motor 30 is about to enter the working state. At this time, the digital logic module 23 acquires the previously latched digital signal. If the digital logic module 23 judges that the electric quantity is less than the first threshold, the battery 29 When the power is too low, the digital logic module 23 controls the first switch 25 to turn off, so as not to allow the motor 30 to start, and an alarm is issued through the alarm module 28, for example, the alarm module 28 issues an alarm by turning on a light or displaying an output on the screen.

If the digital logic module 23 judges that the electric quantity is greater than or equal to the first threshold, the first switch 25 and the second switch 26 are controlled to be turned on, and the motor 30 works normally. The voltage of the battery 29 is compared with the preset undervoltage threshold. If the digital logic module 23 judges that the voltage is less than the undervoltage threshold, then the digital logic module 23 judges that the battery 29 is undervoltage, and the alarm module 28 sends an alarm, and controls the first switch 25 to turn off, so that the battery 29 is not discharged.

In other embodiments, a temperature detection module and a resistor can also be set in the battery monitoring circuit 1. In the standby state, the digital logic module 23 can control the temperature detection module and the voltage value of the battery 29 in addition to controlling the comparator 22. The resistance matching function obtains the electric quantity voltage value of the battery 29, and latches the obtained result value.

To sum up, in the battery monitoring circuit 1 of this embodiment, the voltage dividing resistor 21 is connected in parallel with the battery under test 29, and the second switch 26 is used to connect the voltage dividing resistors 21, and the input end of the comparator 22 is connected to the voltage dividing resistor 21, the output terminal of the comparator 22 is connected to the digital logic module 23, the clock module 24 is connected to the digital logic module 23, and is used to drive the digital logic module 23 to turn on the comparator 22 every preset time, and the first switch 25 is respectively connected to the battery 29 and the motor 30, the switch detection module 27 is connected to the first switch 25 and the digital logic module 23, and is used to detect the state of the first switch 25, and the alarm module 28 is connected to the digital logic module 23, thereby, the comparator 22, the digital logic module 23 , the clock module 24 and the alarm module 28 are all powered by the battery 29, and are not affected by the state of the first switch 25 and the second switch 26, so that when the battery monitoring circuit 1 collects the voltage of the battery 29, it is not affected by the interference voltage and can be more accurate and the clock module 24 controls the digital logic module 23 to regularly wake up the comparator 22 and the voltage dividing resistor 21, thereby obtaining the battery voltage of the battery 29, and latching the comparison result, according to the digital logic module 23 The comparison result of the latch shows the battery power, and judges whether to allow the boot, and, in the motor running process, the digital logic module 23 controls the opening of the comparator 22 and the voltage dividing resistor 21 to obtain the voltage of the battery 29, and compares it with the undervoltage threshold. When the battery is undervoltage, an alarm is used to remind or stop the motor 30 to protect the battery from being discharged, so as to realize accurate collection of battery power and voltage. When the power is insufficient or the voltage is undervoltage, the motor stops to better protect the battery. battery function.

The utility model also provides a battery monitoring system. The monitoring system includes a battery and a battery monitoring circuit. The battery monitoring circuit is used to monitor the battery. The battery monitoring circuit is the battery monitoring circuit 1 disclosed above, which will not be repeated here.

To sum up, the battery monitoring circuit of the present invention judges the battery power and power-on voltage by collecting the battery voltage, the power consumption of the system is small, and it avoids interference with the sampling voltage, improves the accuracy of battery voltage collection, and protects the function of the battery. Its circuit is simple ,cut costs.

The above descriptions are only embodiments of the present utility model, and are not intended to limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the description of the utility model and the contents of the accompanying drawings, or directly or indirectly used in other Related technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (10)

1. a cell-monitoring circuit, is characterized in that, described observation circuit comprises:

Divider resistance, for described cell parallel, one end of described divider resistance connects the positive pole of described battery, and the other end of described divider resistance connects the negative pole of described battery;

Comparer, for obtaining the voltage of described divider resistance, the input end of described comparer is connected with described divider resistance;

Digital logic module, is connected with the output terminal of described comparer, for obtaining the electricity of described battery according to the output of described comparer.

2. circuit according to claim 1, is characterized in that, described electricity and the first threshold preset compare by described digital logic module, and comparative result is converted to digital signal.

3. circuit according to claim 2, is characterized in that, described circuit also comprises:

Clock module, is connected with described digital logic module, opens described comparer for driving described digital logic module every the time of presetting;

First switch, for connecting described battery and outside motor;

Switch detection module, is connected with described first switch and described digital logic module respectively, for detecting the state of described first switch.

4. circuit according to claim 3, is characterized in that, when described first switch conduction, if when described electricity is less than described first threshold, described digital logic module controls described first switch OFF;

If when described electricity is more than or equal to described first threshold, described motor normally works, and described digital logic module also obtains the voltage of described battery by described comparer and described divider resistance, voltage and the brownout threshold preset is compared;

If described voltage is less than described brownout threshold, described digital logic module controls described first switch OFF, and described motor quits work.

5. circuit according to claim 4, it is characterized in that, described circuit also comprises alarm module, is connected with described digital logic module, when described electricity is less than described first threshold or described voltage is less than described brownout threshold, described digital logic module controls described alarm module and opens.

6. circuit according to claim 5, is characterized in that, described divider resistance comprises the first resistance and the second resistance that are connected in series, and described first resistance is connected with described second resistance by second switch.

7. a battery monitoring system, is characterized in that, described system comprises battery and cell-monitoring circuit, and described cell-monitoring circuit is for monitoring described battery; Described cell-monitoring circuit comprises:

Divider resistance, for described cell parallel, one end of described divider resistance connects the positive pole of described battery, and the other end of described divider resistance connects the negative pole of described battery;

Comparer, for obtaining the voltage of described divider resistance, the input end of described comparer is connected with described divider resistance;

Digital logic module, is connected with the output terminal of described comparer, for obtaining the electricity of described battery according to the output of described comparer.

8. system according to claim 7, is characterized in that, described electricity and the first threshold preset compare by described digital logic module, and comparative result is converted to digital signal.

9. system according to claim 8, is characterized in that, described circuit also comprises:

Clock module, is connected with described digital logic module, opens described comparer for driving described digital logic module every the time of presetting;

First switch, for connecting described battery and outside motor;

Switch detection module, is connected with described first switch and described digital logic module respectively, for detecting the state of described first switch.

10. system according to claim 9, is characterized in that, when described first switch conduction, if when described electricity is less than described first threshold, described digital logic module controls described first switch OFF;

If when described electricity is more than or equal to described first threshold, described motor normally works, and described digital logic module also obtains the voltage of described battery by described comparer and described divider resistance, voltage and the brownout threshold preset is compared;

If described voltage is less than described brownout threshold, described digital logic module controls described first switch OFF, and described motor quits work.