CN218829086U - Battery protection circuit, power supply circuit and electric equipment - Google Patents
Battery protection circuit, power supply circuit and electric equipment Download PDFInfo
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- CN218829086U CN218829086U CN202222714533.9U CN202222714533U CN218829086U CN 218829086 U CN218829086 U CN 218829086U CN 202222714533 U CN202222714533 U CN 202222714533U CN 218829086 U CN218829086 U CN 218829086U
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Abstract
The application provides a battery protection circuit, a power supply circuit and electric equipment. The battery protection circuit comprises a detection unit, a switch unit and a time delay control unit. The detection unit is respectively electrically connected with the switch unit and the delay control unit, the delay control unit is electrically connected with the switch unit, and the switch unit is used for being connected between the battery and the load in series. The detection unit is used for collecting a first voltage output by the switch unit to the load and outputting a first signal to the delay control unit when the first voltage is smaller than a preset voltage. The delay control unit is used for continuously outputting the first control signal to the switch unit when the duration time of the first signal is less than the preset time. The switch unit is used for conducting according to the first control signal to enable the battery and the load to be conducted. The battery protection circuit provided by the embodiment of the application can solve the problem that the battery cannot supply power to the load due to the fact that the load is too large instantly and the battery protection circuit can break the connection between the battery and the load by setting the delay control unit.
Description
Technical Field
The application belongs to the battery protection field, especially relates to a battery protection circuit, power supply circuit and consumer.
Background
Batteries are used as power supply devices for electronic products such as smart phones, notebook computers, and the like. Since the battery itself cannot withstand overcharge or overdischarge, it is necessary to add a battery protection circuit for preventing overcharge or overdischarge of the battery in actual use. When the battery supplies power to the load, if the load is too large instantly, the battery protection circuit can disconnect the connection between the battery and the load, so that the battery cannot supply power to the load.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a battery protection circuit, a power supply circuit and electric equipment, can solve the load too big in the twinkling of an eye, and battery protection circuit can break off the connection between battery and the load, leads to the unable problem to the load power supply of battery.
In a first aspect, an embodiment of the present application provides a battery protection circuit, which includes a detection unit, a switch unit, and a delay control unit; the detection unit is respectively electrically connected with the switch unit and the delay control unit, the delay control unit is electrically connected with the switch unit, and the switch unit is used for being connected between a battery and a load in series;
the detection unit is used for acquiring a first voltage output to the load by the switch unit and outputting a first signal to the delay control unit when the first voltage is smaller than a preset voltage; the delay control unit is used for continuously outputting a first control signal to the switch unit when the duration time of the first signal is less than the preset time; the switch unit is used for conducting according to the first control signal to enable the battery and the load to be conducted.
In a possible implementation manner of the first aspect, the delay control unit includes a first resistor and a first capacitor, a first end of the first resistor is electrically connected to a first end of the first capacitor and the switch unit, a second end of the first resistor is electrically connected to the detection unit, and a second end of the first capacitor is grounded;
the first capacitor discharges according to the state of the output end of the detection unit, and when the detection unit outputs a low level, the first capacitor is in a discharge state; when the discharge time of the first capacitor is less than the preset time, the delay control unit continuously outputs a first control signal to the switch unit; and when the discharge time of the first capacitor is greater than or equal to the preset time, the delay control unit continuously outputs a second control signal to the switch unit.
In a possible implementation manner of the first aspect, the detection unit includes a voltage detection chip, an input end of the voltage detection chip is electrically connected to the load and the switch unit, respectively, and an output end of the voltage detection chip is electrically connected to the delay control unit;
the voltage detection chip is used for collecting a first voltage output to the load by the switch unit and comparing the first voltage with the preset voltage; when the first voltage is lower than the preset voltage, the voltage detection chip is further used for outputting the first signal to the delay control unit; when the first voltage is greater than or equal to the preset voltage, the output end of the voltage detection chip is in a high-impedance state.
In a possible implementation manner of the first aspect, the detection unit further includes a second resistor, a first end of the second resistor is electrically connected to the output end of the voltage detection chip and the delay control unit, and a second end of the second resistor is electrically connected to the input end of the voltage detection chip, the switch unit, and the load.
In a possible implementation manner of the first aspect, the switch unit includes an analog switch chip, a first input end of the analog switch chip is electrically connected to the delay control unit, a second input end of the analog switch chip is electrically connected to the battery, and an output end of the analog switch chip is electrically connected to the detection unit and the load, respectively;
the analog switch chip is used for conducting according to the first control signal to enable the battery and the load to be conducted; the analog switch chip is also used for disconnecting according to a second control signal to disconnect the battery and the load, and the second control signal is generated by the delay control unit when the duration time of the first signal is greater than or equal to the preset time.
In a second aspect, an embodiment of the present application provides a power supply circuit, including a battery, a charging unit, and the battery protection circuit of any one of the first aspects;
the switch unit is connected in series between the battery and the charging unit, the detection unit is respectively electrically connected with the switch unit and the delay control unit, the delay control unit is electrically connected with the switch unit, and the switch unit is also used for being electrically connected with a load.
In a possible implementation manner of the second aspect, the charging unit includes a charging chip, an input end of the charging chip is electrically connected to an external power supply device, and an output end of the charging chip is electrically connected to the switching unit, the detecting unit, and the load, respectively.
In a possible implementation manner of the second aspect, the power circuit further includes a first voltage stabilizing diode, an anode of the first voltage stabilizing diode is electrically connected to the output end of the charging chip and the switch unit, and a cathode of the first voltage stabilizing diode is electrically connected to the detection unit and the load.
In a possible implementation manner of the second aspect, the power circuit further includes a second zener diode, an anode of the second zener diode is electrically connected to the external power supply device, and a cathode of the second zener diode is electrically connected to the detection unit and the load, respectively.
In a third aspect, an embodiment of the present application provides an electrical device, including the power supply circuit described in any one of the second aspects.
Compared with the prior art, the embodiment of the application has the advantages that:
the embodiment of the application provides a battery protection circuit, which comprises a detection unit, a switch unit and a time delay control unit. The detection unit is used for acquiring a first voltage output by the switch unit to a load, if the load is increased, the first voltage output by the switch unit is reduced, when the first voltage is smaller than a preset voltage, the detection unit is used for outputting a first signal to the delay control unit, when the first voltage is larger than or equal to the preset voltage, the detection unit is used for outputting a second signal to the delay control unit, and the first signal and the second signal are different signals. When the duration time of the first signal is less than the preset time, the load is instantly changed, and the delay control unit continuously outputs the first control signal to the switch unit. The switch unit is used for being conducted according to the first control signal, so that the battery and the load are kept conducted, the battery supplies power for the load normally, and the problem that the battery cannot supply power for the load normally due to the fact that the load changes instantly is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic block diagram of a battery protection circuit according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a battery protection circuit and a power circuit according to an embodiment of the disclosure.
In the figure: 10. a detection unit; 20. a switch unit; 30. a delay control unit; 40. a battery; 50. a load; 60. a charging unit; 01. a battery protection circuit.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in the specification and appended claims, the term "if" may be interpreted contextually as "when 8230that" or "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless otherwise specifically stated.
When the first voltage collected by the detection unit is greater than or equal to the preset voltage, the existing battery protection circuit outputs a first control signal to the switch unit. The switch unit is used for conducting according to the first control signal, so that the battery and the load are conducted, and the battery supplies power to the load at the moment. And when the first voltage acquired by the detection unit is less than the preset voltage, outputting a second control signal to the switch unit. The switch unit is used for switching off according to the second control signal, so that the battery and the load are disconnected, and the battery does not supply power to the load at the moment. However, when the load is too large instantaneously, which causes that the first voltage collected by the detection unit is less than the preset voltage in a short time, the detection unit still continues to output the second control signal to the switch unit, and the switch unit is used for disconnecting the battery and the load according to the second control signal, so that the battery cannot supply power to the load. When the battery supplies power to the load, if the load is too large instantaneously, the battery protection circuit may disconnect the connection between the battery and the load, resulting in the battery not supplying power to the load.
Based on the above problem, an embodiment of the present application provides a battery protection circuit, where the detection unit is configured to collect a first voltage output by the switch unit to a load, and if the load increases, the first voltage output by the switch unit decreases, when the first voltage is less than a preset voltage, the detection unit is configured to output a first signal to the delay control unit, and when the first voltage is greater than or equal to the preset voltage, the detection unit is configured to output a second signal to the delay control unit, where the first signal and the second signal are different signals. When the duration time of the first signal is less than the preset time, the load is instantly changed, and the delay control unit continuously outputs the first control signal to the switch unit. The switch unit is used for being conducted according to the first control signal, so that the battery and the load are kept conducted, the battery normally supplies power for the load, and the problem that the battery cannot normally supply power for the load due to instantaneous change of the load is solved.
In order to explain the technical solution described in the present application, the following description will be given by way of specific examples.
Fig. 1 shows a schematic block diagram of a battery protection circuit 01 according to an embodiment of the present application. Referring to fig. 1, the battery protection circuit 01 includes a detection unit 10, a switch unit 20, and a delay control unit 30, wherein the detection unit 10 is electrically connected to the switch unit 20 and the delay control unit 30, the delay control unit 30 is electrically connected to the switch unit 20, and the switch unit 20 is configured to be connected in series between a battery 40 and a load 50.
The detection unit 10 is configured to collect a first voltage output by the switch unit 20 to the load 50, and output a first signal to the delay control unit 30 when the first voltage is less than a preset voltage; the delay control unit 30 is configured to continuously output the first control signal to the switch unit 20 when the duration of the first signal is less than a preset time, and the switch unit 20 is configured to be turned on according to the first control signal, so that the battery 40 and the load 50 are turned on.
Specifically, the detecting unit 10 is configured to collect a first voltage output by the switching unit 20 to the load 50, and compare the first voltage output by the switching unit 20 with a preset voltage. When the first voltage output by the switch unit 20 is greater than or equal to the preset voltage, the detection unit 10 outputs a second signal to the delay control unit 30, the delay control unit 30 outputs a first control signal to the switch unit 20 according to the second signal, and after receiving the first control signal output by the delay control unit 30, the switch unit 20 is turned on according to the first control signal, so that the battery 40 and the load 50 are turned on, and at this time, the battery 40 supplies power to the load 50.
When the first voltage output by the switching unit 20 is less than the preset voltage, the detecting unit 10 outputs a first signal to the delay control unit 30. The delay control unit 30 receives the first signal output by the detection unit 10, and compares the duration of the first signal with a preset time. When the duration of the first signal is greater than or equal to the preset time, the delay control unit 30 outputs a second control signal to the switching unit 20. After the switch unit 20 receives the second control signal output by the delay control unit 30, and then disconnects according to the second control signal, so that the battery 40 and the load 50 are disconnected, at this time, the battery 40 cannot supply power to the load 50, and the battery 40 is in a protection state.
When the first voltage output by the switching unit 20 is less than the preset voltage, the detecting unit 10 outputs a first signal to the delay control unit 30. The delay control unit 30 receives the first signal output by the detection unit 10, and compares the duration of the first signal with a preset time. When the duration of the first signal is less than the preset time, it indicates that the first voltage has a transient change, and the delay control unit 30 continues to output the first control signal to the switching unit 20. After receiving the first control signal output by the delay control unit 30, the switching unit 20 is turned on according to the first control signal, so that the battery 40 and the load 50 are turned on, and at this time, the battery 40 supplies power to the load 50. By arranging the delay control unit 30, the battery protection circuit 01 can solve the problem that the load 50 is excessively large instantaneously, so that the first voltage is excessively low instantaneously, and the battery protection circuit 01 can disconnect the battery 40 from the load 50, so that the battery 40 cannot supply power to the load 50.
In an embodiment of the present application, the delay control unit 30 includes a first resistor R1 and a first capacitor C1, a first end of the first resistor R1 is electrically connected to a first end of the first capacitor C1 and the switch unit 20, a second end of the first resistor R1 is electrically connected to the detection unit 10, and a second end of the first capacitor C1 is grounded.
The first capacitor C1 discharges according to the state of the output end of the detection unit 10, and when the detection unit 10 outputs a low level, the first capacitor C1 is in a discharge state; when the discharging time of the first capacitor C1 is less than the preset time, the delay control unit 30 continuously outputs the first control signal to the switching unit 20; when the discharging time of the first capacitor C1 is greater than or equal to the preset time, the delay control unit 30 continuously outputs the second control signal to the switching unit 20.
Specifically, the first resistor R1 and the first capacitor C1 form a delay control unit 30, which is used for continuously outputting the first control signal to the switch unit 20 to delay and turn off the switch unit 20 when the load 50 is instantaneously too large to cause the detection unit 10 to output a low level signal for a short time. The delay control unit 30 is provided to prevent a transient change in the load 50 from causing a problem in which the battery 40 cannot normally supply power to the load 50.
The switching unit 20 is turned on or off according to the control signals (the first control signal and the second control signal), that is, the switching unit 20 is turned on according to the first control signal to turn on the battery 40 and the load 50, and is turned off according to the second control signal to turn off the battery 40 and the load 50. The first control signal is a high level signal, and the second control signal is a low level signal.
When the output terminal of the detection unit 10 is in a high impedance state, the first voltage charges the first capacitor C1 through the second resistor R2, and when the voltage at the two ends of the first capacitor C1 is greater than the turn-on voltage of the switch unit 20, the delay control unit 30 outputs a first control signal to the switch unit 20. After receiving the first control signal output by the delay control unit 30, the switching unit 20 is turned on according to the first control signal, so that the battery 40 and the load 50 are turned on, and at this time, the battery 40 supplies power to the load 50.
When the detection unit 10 outputs a low level, the first capacitor C1 is in a discharging state, and when the discharging time of the first capacitor C1 is shorter than the preset time, that is, the voltage at the two ends of the first capacitor C1 is still greater than the on-state voltage of the switch unit 20, the delay control unit 30 continuously outputs the first control signal to the switch unit 20. After receiving the first control signal output by the delay control unit 30, the switching unit 20 is turned on according to the first control signal, so that the battery 40 and the load 50 are turned on, and at this time, the battery 40 supplies power to the load 50; when the discharging time of the first capacitor C1 is greater than or equal to the preset time, that is, the voltage across the first capacitor C1 is less than the turn-on voltage of the switching unit 20, the delay control unit 30 outputs a second control signal to the switching unit 20. After receiving the second control signal output by the delay control unit 30, the switching unit 20 is turned off according to the second control signal, so that the battery 40 and the load 50 are turned off, at this time, the battery 40 cannot supply power to the load 50, and the battery 40 is in a protection state.
It should be noted that, when the load 50 is excessively large instantaneously, and the detection unit 10 outputs a low level signal for a short time, although the first capacitor C1 is in a discharging state, the discharging time of the first capacitor C1 is less than the preset time, that is, when the voltage across the first capacitor C1 is still greater than the on-voltage of the switch unit 20, the delay control unit 30 continues to output the first control signal to the switch unit 20, and the switch unit 20 is turned off in a delayed manner, so that a problem that the battery 40 cannot normally supply power to the load 50 due to an instantaneous change of the load 50 can be prevented.
For example, the resistance of the first resistor R1 and the capacitance of the first capacitor C1 may be adjusted to adjust the time for turning off the output of the battery 40. For example, the resistance of the first resistor R1 is 100k Ω, the capacitance of the first capacitor C1 is 1uF, the voltage of the battery 40 is 3.8V, the preset voltage is 3.2V, and the discharged voltage of the first capacitor C1 is 0V. The discharge time t at this time is:
t＝1*10 6 *1*10 -6 *Ln[(3.8-0)/(3.2-0)]＝0.172s
in an embodiment of the present application, the detecting unit 10 includes a voltage detecting chip U1, an input terminal of the voltage detecting chip U1 is electrically connected to the load 50 and the switch unit 20, respectively, and an output terminal of the voltage detecting chip U1 is electrically connected to the delay control unit 30.
The voltage detection chip U1 is configured to collect a first voltage output by the switch unit 20 to the load 50, and compare the first voltage with a preset voltage; when the first voltage is lower than the preset voltage, the voltage detection chip U1 is further configured to output a first signal to the delay control unit 30; when the first voltage is greater than or equal to the preset voltage, the output end of the voltage detection chip U1 is in a high-impedance state.
Specifically, as shown in fig. 2, a Vin pin of the voltage detection chip U1 is electrically connected to the switch unit 20, and serves as an input pin of the voltage detection chip U1, and the voltage detection chip U1 collects a first voltage output to the load 50 by the switch unit 20 through the Vin pin. The RST pin of the voltage detection chip U1 is electrically connected to the delay control unit 30, and serves as an output pin of the voltage detection chip U1, and the voltage detection chip U1 outputs a first signal to the delay control unit 30 through the RST pin.
The voltage detection chip U1 collects the first voltage output to the load 50 by the switch unit 20 through the Vin pin, compares the first voltage with a preset voltage, and outputs corresponding signals (the first signal and the high impedance state) at the RST pin according to the comparison result. If the first voltage is lower than the preset voltage, the voltage detection chip U1 outputs a first signal to the delay control unit 30 through the RST pin; if the first voltage is greater than or equal to the preset voltage, the RST pin of the voltage detection chip U1 is in a high-impedance state.
Illustratively, the model of the voltage detection chip U1 is XC6135N32.
In an embodiment of the present application, the detecting unit 10 further includes a second resistor R2, a first end of the second resistor R2 is electrically connected to the output end of the voltage detecting chip U1 and the delay control unit 30, and a second end of the second resistor R2 is electrically connected to the input end of the voltage detecting chip U1, the switch unit 20, and the load 50.
Specifically, the second resistor R2 is connected in series between the delay control unit 30 and the voltage detection chip U1, and is used for pulling up when the output end of the detection unit 10 is in a high-impedance state. The second resistor R2 is connected in series between the delay control unit 30 and the switching unit 20, that is, the second resistor R2 is also used for transmitting the first voltage output by the switching unit 20 to the delay control unit 30.
In one embodiment of the present application, the switch unit 20 includes an analog switch chip U2, a first input terminal of the analog switch chip U2 is electrically connected to the delay control unit 30, a second input terminal of the analog switch chip U2 is electrically connected to the battery 40, and an output terminal of the analog switch chip U2 is electrically connected to the detection unit 10 and the load 50, respectively.
The analog switch chip U2 is used for conducting according to the first control signal, so as to conduct the battery 40 and the load 50; the analog switch chip U2 is configured to switch off according to a second control signal, which is generated by the delay control unit 30 when the duration of the first signal is greater than or equal to a preset time, so as to switch off the battery 40 and the load 50.
Specifically, as shown in fig. 2, an S pin of the analog switch chip U2 is electrically connected to the delay control unit 30 and serves as a first input pin of the analog switch chip U2, and the analog switch chip U2 receives control signals (a first control signal and a second control signal) output by the delay control unit 30 through the S pin. The COM pin of the analog switch chip U2 is electrically connected to the battery 40, and serves as a second input pin of the analog switch chip U2, and the analog switch chip U2 receives the voltage of the battery 40 through the COM pin. The B1 pin of the analog switch chip U2 is electrically connected to the detection unit 10 and the load 50, respectively, and serves as an output pin of the analog switch chip U2, and the analog switch chip U2 outputs a voltage to the detection unit 10 and the load 50 through the B1 pin.
The analog switch chip U2 receives the control signals (the first control signal and the second control signal) output by the delay control unit 30 through the S pin, and turns on or off according to the control signals, thereby turning on or off the battery 40 and the load 50. If the analog switch chip U2 receives the first control signal output by the delay control unit 30 through the S pin, the analog switch chip U2 is turned on according to the first control signal, that is, the COM pin of the analog switch chip U2 is electrically connected to the B1 pin of the analog switch chip U2, so that the battery 40 is turned on with the load 50, and the battery 40 supplies power to the load 50. If the analog switch chip U2 receives the second control signal output by the delay control unit 30 through the S pin, the analog switch chip U2 is turned off according to the second control signal, that is, the COM pin of the analog switch chip U2 is electrically connected to the B0 pin of the analog switch chip U2, so that the battery 40 and the load 50 are turned off, and at this time, the battery 40 cannot supply power to the load 50, and the battery 40 is in a protection state.
When the analog switch chip U2 is turned on according to the first control signal, and the battery 40 supplies power to the load 50, the battery 40 supplies power to the load 50 through the COM pin of the analog switch chip U2 and the B1 pin of the analog switch chip U2.
Meanwhile, the analog switch chip U2 comprises a double-throw switch, a common contact of the double-throw switch is electrically connected with a COM pin of the analog switch chip U2, a normally open contact of the double-throw switch is electrically connected with a B0 pin of the analog switch chip U2, and a normally closed contact of the double-throw switch is electrically connected with a B1 pin of the analog switch chip U2. The common contact of the double throw switch can be controlled to be electrically connected with other contacts (normally open contact and normally closed contact) according to the control signals (first control signal and second control signal) output by the delay control unit 30. If the delay control unit 30 outputs the first control signal to the analog switch unit 20, the analog switch chip U2 controls the common contact of the double-throw switch to be electrically connected with the normally closed contact of the double-throw switch according to the first control signal, so that the COM pin of the analog switch chip U2 is electrically connected with the B1 pin of the analog switch chip U2, and the battery 40 is electrically connected with the load 50, and at this time, the battery 40 supplies power to the load 50. If the delay control unit 30 outputs the first control signal to the analog switch unit 20, the analog switch chip U2 controls the common contact of the double-throw switch to be electrically connected with the normally open contact of the double-throw switch according to the second control signal, so that the COM pin of the analog switch chip U2 is electrically connected with the B0 pin of the analog switch chip U2, and thus the battery 40 is disconnected from the load 50, the battery 40 cannot supply power to the load 50, and the battery 40 is in a protection state.
Illustratively, the analog switch chip U2 may be model DIO1159.
In one embodiment of the present application, as shown in fig. 2, the power supply circuit includes a battery 40, a charging unit 60, and a battery protection circuit 01.
The switch unit 20 is connected in series between the battery 40 and the charging unit 60, the detection unit 10 is electrically connected with the switch unit 20 and the delay control unit 30 respectively, the delay control unit 30 is electrically connected with the switch unit 20, and the switch unit 20 is further used for being electrically connected with the load 50.
Specifically, the switching unit 20 is connected in series between the battery 40 and the charging unit 60, and the charging unit 60 is also used to electrically connect with the load 50. The charging unit 60 may charge the battery 40 through the switching unit 20 and may also directly supply power to the load 50, and at the same time, the battery 40 may supply power to the load 50 through the switching unit 20.
The detection unit 10 is configured to collect a first voltage output by the switch unit 20 to the load 50, and compare the first voltage output by the switch unit 20 with a preset voltage. When the first voltage output by the switch unit 20 is greater than or equal to the preset voltage, the detection unit 10 outputs a second signal to the delay control unit 30, the delay control unit 30 outputs a first control signal to the switch unit 20 according to the second signal, and after receiving the first control signal output by the delay control unit 30, the switch unit 20 is turned on according to the first control signal, so that the battery 40 and the load 50 are turned on, and at this time, the battery 40 supplies power to the load 50.
When the first voltage output by the switching unit 20 is less than the preset voltage, the detecting unit 10 outputs a first signal to the delay control unit 30. The delay control unit 30 receives the first signal output by the detection unit 10, and compares the duration of the first signal with a preset time. When the duration of the first signal is greater than or equal to the preset time, the delay control unit 30 outputs a second control signal to the switching unit 20. After the switch unit 20 receives the second control signal output by the delay control unit 30, and then is turned off according to the second control signal, so that the battery 40 and the load 50 are turned off, at this time, the battery 40 cannot supply power to the load 50, and the battery 40 is in a protection state.
When the first voltage output by the switching unit 20 is less than the preset voltage, the detecting unit 10 outputs a first signal to the delay control unit 30. The delay control unit 30 receives the first signal output by the detection unit 10, and compares the duration of the first signal with a preset time. When the duration of the first signal is less than the preset time, it indicates that the first voltage has a transient change, and at this time, the delay control unit 30 continuously outputs the first control signal to the switching unit 20. After receiving the first control signal output by the delay control unit 30, the switching unit 20 is turned on according to the first control signal, so that the battery 40 and the load 50 are turned on, and at this time, the battery 40 supplies power to the load 50. By arranging the delay control unit 30, the battery protection circuit 01 can solve the problem that the load 50 is excessively large instantaneously, so that the first voltage is excessively low instantaneously, and the battery protection circuit 01 can disconnect the battery 40 from the load 50, so that the battery 40 cannot supply power to the load 50.
It should be noted that, when the charging unit 60 charges the battery 40 through the switching unit 20, the battery 40 may not simultaneously supply power to the load 50 through the switching unit 20.
In one embodiment of the present application, the charging unit 60 includes a charging chip U3, an input terminal of the charging chip U3 is electrically connected to the external power supply interface, and an output terminal of the charging chip U3 is electrically connected to the switching unit 20, the detecting unit 10 and the load 50, respectively.
Specifically, the VCC pin of the charging chip U3 is electrically connected to an external power supply device, and serves as an input pin of the charging chip U3, and the BAT pin of the charging chip U3 is electrically connected to the switch unit 20, the detection unit 10, and the load 50, respectively, and serves as an output pin of the charging chip U3. The external power supply device charges the battery 40 through the VCC pin of the charging chip U3, the BAT pin of the charging chip U3, and the switching unit 20. The detection unit 10 is configured to collect a charging voltage output by a BAT pin of the charging chip U3, and compare the charging voltage with a preset voltage. The external power supply device is also used to directly supply power to the load 50.
In an embodiment of the present application, the power circuit further includes a first voltage regulator diode D1, an anode of the first voltage regulator diode D1 is electrically connected to the output terminal of the charging chip U3 and the switch unit 20, respectively, and a cathode of the first voltage regulator diode D1 is electrically connected to the detection unit 10 and the load 50, respectively.
Specifically, the first zener diode D1 may be used as a voltage regulator or a voltage reference element, and may perform voltage stabilization and amplitude limiting on an input voltage signal. When the voltage signal input from the anode of the first zener diode D1 is unstable, the unstable voltage signal can be changed into a more stable voltage signal by arranging the first zener diode D1, and the more stable voltage signal is output from the cathode of the first zener diode D1. The first voltage stabilizing diode D1 is connected in series between the charging chip U3 and the load 50, so that the charging voltage output by the charging chip U3 is stabilized, and the charging voltage supplied to the load 50 is more stable. First zener diode D1 concatenates between charging chip U3 and detecting element 10, makes the charging voltage of charging chip U3 output stabilize to the charging voltage that makes detecting element 10 gather is more stable, improves detecting element 10's detection precision and reliability. The first voltage stabilizing diode D1 is connected in series between the detection unit 10 and the switch unit 20, so that the first voltage collected by the detection unit 10 is more stable, and the detection accuracy and reliability of the detection unit 10 are improved.
In an embodiment of the present application, the power circuit further includes a second zener diode D2, an anode of the second zener diode D2 is electrically connected to the external power supply device, and a cathode of the second zener diode D2 is electrically connected to the detecting unit 10 and the load 50, respectively.
Specifically, the second zener diode D2 may be used as a voltage regulator or a voltage reference element, and may perform voltage stabilization and amplitude limiting on an input voltage signal. When the voltage signal inputted to the anode of the second zener diode D2 is unstable, the unstable voltage signal may be changed into a more stable voltage signal by providing the second zener diode D2, and the more stable voltage signal may be outputted from the cathode of the second zener diode D2. The second zener diode D2 is connected in series between the external power supply device and the load 50, so that the charging voltage output by the external power supply device is more stable, and the charging voltage supplied to the load 50 is more stable. The second zener diode D2 is connected in series between the external power supply device and the detection unit 10, so that the charging voltage output by the external power supply device is stabilized, the charging voltage acquired by the detection unit 10 is more stable, and the detection accuracy and reliability of the detection unit 10 are improved.
The application also discloses an electric device which comprises the power supply circuit, the electric device adopts the power supply circuit, and the problem that the load 50 is too large instantly, and the battery protection circuit 01 can disconnect the battery 40 and the load 50, so that the battery 40 cannot supply power to the load 50 can be solved.
The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present application, and they should be construed as being included in the present application.
Claims (10)
1. A battery protection circuit is characterized by comprising a detection unit, a switch unit and a time delay control unit; the detection unit is respectively electrically connected with the switch unit and the delay control unit, the delay control unit is electrically connected with the switch unit, and the switch unit is used for being connected between a battery and a load in series;
the detection unit is used for collecting a first voltage output to the load by the switch unit and outputting a first signal to the delay control unit when the first voltage is smaller than a preset voltage; the delay control unit is used for continuously outputting a first control signal to the switch unit when the duration time of the first signal is less than the preset time; the switch unit is used for conducting according to the first control signal to enable the battery and the load to be conducted.
2. The battery protection circuit according to claim 1, wherein the delay control unit comprises a first resistor and a first capacitor, a first end of the first resistor is electrically connected to a first end of the first capacitor and the switch unit, respectively, a second end of the first resistor is electrically connected to the detection unit, and a second end of the first capacitor is grounded;
the first capacitor discharges according to the state of the output end of the detection unit, and when the detection unit outputs a low level, the first capacitor is in a discharge state; when the discharge time of the first capacitor is less than the preset time, the delay control unit continuously outputs a first control signal to the switch unit; and when the discharge time of the first capacitor is greater than or equal to the preset time, the delay control unit continuously outputs a second control signal to the switch unit.
3. The battery protection circuit according to claim 1, wherein the detection unit comprises a voltage detection chip, an input end of the voltage detection chip is electrically connected with the load and the switch unit, respectively, and an output end of the voltage detection chip is electrically connected with the delay control unit;
the voltage detection chip is used for collecting a first voltage output to the load by the switch unit and comparing the first voltage with the preset voltage; when the first voltage is lower than the preset voltage, the voltage detection chip is further used for outputting the first signal to the delay control unit; and when the first voltage is greater than or equal to the preset voltage, the output end of the voltage detection chip is in a high-impedance state.
4. The battery protection circuit of claim 3, wherein the detection unit further comprises a second resistor, a first end of the second resistor is electrically connected to the output terminal of the voltage detection chip and the delay control unit, respectively, and a second end of the second resistor is electrically connected to the input terminal of the voltage detection chip, the switch unit, and the load, respectively.
5. The battery protection circuit according to claim 1, wherein the switch unit comprises an analog switch chip, a first input terminal of the analog switch chip is electrically connected to the delay control unit, a second input terminal of the analog switch chip is electrically connected to the battery, and an output terminal of the analog switch chip is electrically connected to the detection unit and the load, respectively;
the analog switch chip is used for conducting according to the first control signal to enable the battery and the load to be conducted; the analog switch chip is also used for disconnecting according to a second control signal to disconnect the battery and the load, and the second control signal is generated by the delay control unit when the duration time of the first signal is greater than or equal to the preset time.
6. A power supply circuit characterized by comprising a battery, a charging unit, and the battery protection circuit of any one of claims 1 to 5;
the switch unit is connected in series between the battery and the charging unit, the detection unit is electrically connected with the switch unit and the delay control unit respectively, the delay control unit is electrically connected with the switch unit, and the switch unit is also used for being electrically connected with a load.
7. The power supply circuit according to claim 6, wherein the charging unit comprises a charging chip, an input end of the charging chip is electrically connected with an external power supply device, and an output end of the charging chip is electrically connected with the switching unit, the detection unit and the load respectively.
8. The power supply circuit according to claim 7, further comprising a first zener diode, wherein an anode of the first zener diode is electrically connected to the output terminal of the charging chip and the switch unit, respectively, and a cathode of the first zener diode is electrically connected to the detection unit and the load, respectively.
9. The power supply circuit according to claim 8, further comprising a second zener diode, an anode of the second zener diode being electrically connected to the external power supply device, and a cathode of the second zener diode being electrically connected to the detection unit and the load, respectively.
10. An electrical consumer, characterized in that it comprises a power supply circuit according to any one of claims 6-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222714533.9U CN218829086U (en) | 2022-10-10 | 2022-10-10 | Battery protection circuit, power supply circuit and electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222714533.9U CN218829086U (en) | 2022-10-10 | 2022-10-10 | Battery protection circuit, power supply circuit and electric equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218829086U true CN218829086U (en) | 2023-04-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222714533.9U Active CN218829086U (en) | 2022-10-10 | 2022-10-10 | Battery protection circuit, power supply circuit and electric equipment |
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| Country | Link |
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| CN (1) | CN218829086U (en) |
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