CN209963741U - Undervoltage protection circuit and battery device - Google Patents
Undervoltage protection circuit and battery device Download PDFInfo
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- CN209963741U CN209963741U CN201920481254.8U CN201920481254U CN209963741U CN 209963741 U CN209963741 U CN 209963741U CN 201920481254 U CN201920481254 U CN 201920481254U CN 209963741 U CN209963741 U CN 209963741U
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Abstract
The utility model discloses an under-voltage protection circuit and a battery device, wherein the under-voltage protection circuit comprises a power input end, a voltage detection circuit, a switch output circuit and a power output end; the power supply input end is used for connecting the battery output end, the input end of the voltage detection circuit is connected with the power supply input end, the output end of the voltage detection circuit is connected with the controlled end of the switch output circuit, the input end of the switch output circuit is connected with the power supply input end, and the output end of the switch output circuit is connected with the power supply output end; the voltage detection circuit outputs a first control signal when detecting that the power supply voltage of the power supply input end is greater than or equal to a preset voltage, and the switch output circuit outputs the power supply voltage input by the power supply input end to the power supply output end; when the power supply voltage of the power supply input end is detected to be smaller than the preset voltage, a second control signal is output, and the switch output circuit cuts off the power supply voltage output from the power supply input end to the power supply output end. The utility model discloses technical scheme has improved the life of battery.
Description
Technical Field
The utility model relates to a power supply protection technical field, in particular to undervoltage protection circuit and battery device.
Background
Battery management system (BATTERY MANAGEMENT SYSTEM) is the tie between BATTERY and the user, and the main object is secondary BATTERY, mainly is in order to improve the utilization ratio of BATTERY, prevents that overcharge and overdischarge from appearing in the BATTERY, can be used to electric automobile, storage BATTERY car, robot, unmanned aerial vehicle etc.. The undervoltage protection function of the battery management system is invalid due to the functional failure of the battery management system; when the undervoltage protection is invalid, the system can continue to consume power until the electric quantity of the whole lithium battery pack is completely emptied, so that the whole battery pack is scrapped.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims at providing an undervoltage protection circuit and battery device aims at improving the life of battery.
In order to achieve the above object, the present invention provides an under-voltage protection circuit, which includes a power input terminal, a voltage detection circuit, a switch output circuit and a power output terminal;
the power supply input end is used for being connected with a battery output end, the input end of the voltage detection circuit is connected with the power supply input end, the output end of the voltage detection circuit is connected with the controlled end of the switch output circuit, the input end of the switch output circuit is connected with the power supply input end, and the output end of the switch output circuit is connected with the power supply output end;
the voltage detection circuit is used for outputting a first control signal when detecting that the power supply voltage of the power supply input end is greater than or equal to a preset voltage, and outputting a second control signal when detecting that the power supply voltage of the power supply input end is less than the preset voltage;
the switch output circuit is used for being turned on according to the first control signal, outputting the power supply voltage input by the power supply input end to the power supply output end, and being turned off according to the second control signal, and cutting off the power supply voltage output by the power supply input end to the power supply output end.
Optionally, the voltage detection circuit includes a voltage divider circuit, a switch trigger circuit, and a control circuit, where a first end of the voltage divider circuit and an input end of the switch trigger circuit are respectively connected to the power input end, a second end of the voltage divider circuit is connected to a controlled end of the switch trigger circuit, an output end of the switch trigger circuit is connected to an input end of the control circuit, and an output end of the control circuit is an output end of the voltage detection circuit;
the voltage division circuit is used for regulating and controlling the power supply voltage input by the power supply input end so as to output a voltage drop signal to the switch trigger circuit;
the switch trigger circuit is used for triggering the operation of the control circuit according to the voltage drop signal output by the voltage division circuit;
and the control circuit is used for processing the voltage output by the switch trigger circuit to output a high level or a low level.
Optionally, the voltage dividing circuit includes a first resistor and a second resistor, a first end of the first resistor is connected to the power input terminal, a second end of the first resistor is connected to a first end of the second resistor, and a second end of the second resistor is grounded.
Optionally, the switch trigger circuit includes a third resistor and a first triode, a first end of the third resistor is connected to the power input end, a second end of the third resistor is interconnected to the input end of the first triode, the controlled end of the first triode is the controlled end of the switch trigger circuit, and the output end of the first triode is the output end of the switch trigger circuit.
Optionally, the control circuit includes a fourth resistor, a second capacitor, and a voltage control chip, where a first end of the fourth resistor is the input end of the control circuit, a second end of the fourth resistor, a first end of the second capacitor, and an input end of the voltage control chip are interconnected, a second end of the second capacitor is grounded, and an output end of the voltage control chip is the output end of the control circuit.
Optionally, the switch output circuit includes a fifth resistor, a sixth resistor, a seventh resistor, a second triode, and a third triode, the first end of the fifth resistor is the input end of the switch output circuit, the second end of the fifth resistor is connected to the controlled end of the second triode, the input end of the second triode is connected to the second end of the sixth resistor, the output end of the second triode is grounded, the first end of the sixth resistor, the second end of the seventh resistor, and the controlled end of the third triode are interconnected, the first end of the seventh resistor is connected to the input end of the third triode, and the output end of the third triode is connected to the power output end.
Optionally, the under-voltage protection circuit further includes a first capacitor, a first end of the first capacitor is connected to the power input terminal, and a second end of the first capacitor is grounded.
Optionally, the under-voltage protection circuit further includes a third capacitor, a first end of the third capacitor is connected to the power output terminal, and a second end of the third capacitor is grounded.
The utility model also provides a battery device, battery device include the battery and as above undervoltage protection circuit, the battery output of battery with undervoltage protection circuit's power input end is connected, voltage detection circuit's input with power input end connects, voltage detection circuit's output with switch output circuit's controlled end is connected, switch output circuit's input with power input end connects, switch output circuit's output with power output end connects.
The utility model discloses technical scheme is through setting up voltage detection circuit and switch output circuit in undervoltage protection circuit, in order to solve the battery when supplying power to the load the battery management system lose efficacy after continue consume the harm to the battery, voltage detection circuit detects the mains voltage of the power input end that is connected to the battery output end, voltage detection circuit inside can produce the voltage detection signal this moment, compare with the predetermined voltage value, when voltage detection signal is greater than or equal to the predetermined voltage value, when power input is normal in this circuit promptly, export first control signal and switch on with control switch output circuit, with the mains voltage output of power input end input to the power output end, for the load output mains voltage of inserting; when the voltage detection signal is smaller than the preset voltage value, namely when the circuit has an undervoltage condition, the second control signal is output to control the switch output circuit to be switched off, so that the power supply voltage output from the power supply input end to the power supply output end is cut off, the undervoltage protection circuit does not output the power supply voltage when the undervoltage protection circuit is undervoltage, and the output voltage is started to supply power to the load only when the power supply voltage output from the battery output end is larger than the undervoltage protection value. The utility model provides the high life of battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of a circuit structure of an embodiment of the under-voltage protection circuit of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Voltage detection circuit | R4 | |
| 200 | Switch output circuit | R5 | |
| 101 | Voltage divider circuit | R6 | |
| 102 | Switch trigger circuit | R7 | |
| 103 | Control circuit | Q1 | A first triode |
| C1 | First capacitor | Q2 | Second triode |
| C2 | Second capacitor | Q3 | Third triode |
| C3 | Third capacitor | U1 | Voltage control chip |
| R1 | A first resistor | VCC_IN | Power input terminal |
| R2 | Second resistance | VCC_OUT | Power supply output terminal |
| R3 | Third resistance |
The realization, the functional characteristics and the feasible points of the utility model are further explained by referring to the attached drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides an under-voltage protection circuit.
IN the embodiment of the present invention, as shown IN fig. 1, the under-voltage protection circuit includes a power input terminal VCC _ IN, a voltage detection circuit 100, a switch output circuit 200, and a power output terminal VCC _ OUT;
the power input terminal VCC _ IN is used for connecting a battery output terminal, the input terminal of the voltage detection circuit 100 is connected with the power input terminal VCC _ IN, the output terminal of the voltage detection circuit 100 is connected with the controlled terminal of the switch output circuit 200, the input terminal of the switch output circuit 200 is connected with the power input terminal VCC _ IN, and the output terminal of the switch output circuit 200 is connected with the power output terminal VCC _ OUT;
the voltage detection circuit 100 is configured to output a first control signal when detecting that the power supply voltage of the power supply input terminal VCC _ IN is greater than or equal to a preset voltage, and output a second control signal when detecting that the power supply voltage of the power supply input terminal VCC _ IN is less than the preset voltage;
the switch output circuit 200 is configured to be turned on according to the first control signal, output the power voltage input by the power input terminal VCC _ IN to the power output terminal VCC _ OUT, and cut off the power voltage output by the power input terminal VCC _ IN to the power output terminal VCC _ OUT according to the turn-off of the second control signal.
IN this embodiment, the voltage detection circuit 100 compares the detected power voltage of the power input terminal VCC _ IN with a preset voltage, and may compare the preset reference signal with the detected power voltage through the comparator circuit to determine whether the voltage value of the power input terminal VCC _ IN is normal, that is, whether the voltage value is lower than the under-voltage protection value; or the microprocessor is adopted to compare the corresponding voltage value input by the power input end VCC _ IN with the threshold voltage so as to determine whether the output voltage of the battery is lower than the undervoltage protection value; or, the voltage stabilizing control circuit is used to identify whether the voltage value corresponding to the voltage detection signal of the power input terminal VCC _ IN reaches its critical voltage to determine whether the battery output voltage is lower than the under-voltage protection value, which is not limited herein.
It should be noted that, a comparator circuit is adopted to compare a preset reference signal with a detected power supply voltage to determine whether a voltage value of a power supply input terminal VCC _ IN is normal, specifically, when it is determined that a voltage value corresponding to the power supply voltage input by the power supply input terminal VCC _ IN is greater than or equal to the preset reference signal, it is determined that the input power supply voltage is higher than an under-voltage protection value, a first control signal is output, and a switch output circuit 200 is controlled to be turned on to output the power supply voltage input by the power supply input terminal VCC _ IN to a power supply output terminal VCC _ OUT to supply power to a load; when the voltage value corresponding to the power voltage input by the power input end VCC _ IN is determined to be smaller than the preset reference signal, the input power voltage is determined to be lower than the under-voltage protection value, a second control signal is output, the control switch output circuit 200 is switched off, and the power input end VCC _ IN is switched off and outputs the power voltage of the power output end VCC _ OUT, so that the electric quantity of the storage battery is protected from being exhausted under the under-voltage condition.
Comparing a corresponding voltage value input by a power input end VCC _ IN with a threshold voltage by using a microprocessor to determine whether the battery output voltage is lower than an under-voltage protection value, specifically, determining that the battery output voltage is higher than the under-voltage protection value when the corresponding voltage value input by the power input end VCC _ IN is greater than or equal to the threshold voltage, outputting a first control signal, controlling a switch output circuit 200 to be started so as to output the power voltage input by the power input end VCC _ IN to a power output end VCC _ OUT and supplying power to a load; when the corresponding voltage value input by the power input end VCC _ IN is determined to be smaller than the threshold voltage, the battery output voltage is determined to be lower than the undervoltage protection value, a second control signal is output, the switch output circuit 200 is controlled to be switched off, and the power input end VCC _ IN is switched off and outputs the power voltage of the power output end VCC _ OUT.
Identifying whether a voltage value corresponding to a voltage detection signal of a power input end VCC _ IN reaches a critical voltage of the power input end VCC _ IN by using a voltage stabilization control circuit to determine whether a battery output voltage is lower than an undervoltage protection value, specifically, determining that the battery output voltage is higher than the undervoltage protection value when the voltage value corresponding to the voltage detection signal of the power input end VCC _ IN is greater than or equal to the critical voltage, outputting a first control signal, and controlling a switch output circuit 200 to be switched on to output the power voltage input by the power input end VCC _ IN to a power output end VCC _ OUT so as to supply power to a load; when the voltage value corresponding to the voltage detection signal of the power input end VCC _ IN is determined to be smaller than the critical voltage, the battery output voltage is determined to be lower than the under-voltage protection value, a second control signal is output, the control switch output circuit 200 is switched off, and the power input end VCC _ IN is switched off and outputs the power voltage of the power output end VCC _ OUT.
The switch output circuit 200 may be implemented by an electronic switch such as a triode, a MOS transistor, etc., and is not limited herein.
The utility model discloses technical scheme is through setting up voltage detection circuit 100 and switch output circuit 200 IN undervoltage protection circuit, continue to consume electricity to the harm of battery after the battery management system became invalid when supplying power to the load IN order to solve the battery, voltage detection circuit 100 detects the mains voltage of the power input end VCC _ IN that is connected to the battery output end, voltage detection circuit 100 inside can produce voltage detection signal this moment, compare with the preset voltage value, when voltage detection signal is greater than or equal to the preset voltage value, when power input is normal IN this circuit promptly, export first control signal and switch on with control switch output circuit 200, will the mains voltage of power input VCC _ IN input export to power output end VCC _ OUT, for the load output mains voltage of inserting; when the voltage detection signal is less than the preset voltage value, namely when the circuit appears under-voltage condition, the second control signal is output to control the switch output circuit 200 to be switched off, so that the power input end VCC _ IN is output to the power voltage of the power output end VCC _ OUT, thereby realizing that the under-voltage protection circuit does not output the power voltage when under-voltage, and only when the power voltage output by the battery output end is greater than the under-voltage protection value, the output voltage is started to supply power to the load. The utility model provides the high life of battery.
IN an embodiment, as shown IN fig. 1, the voltage detection circuit 100 includes a voltage division circuit 101, a switch trigger circuit 102, and a control circuit 103, wherein a first end of the voltage division circuit 101 and an input end of the switch trigger circuit 102 are respectively connected to the power input terminal VCC _ IN, a second end of the voltage division circuit 101 is connected to a controlled end of the switch trigger circuit 102, an output end of the switch trigger circuit 102 is connected to an input end of the control circuit 103, and an output end of the control circuit 103 is an output end of the voltage detection circuit 100;
the voltage dividing circuit 101 is configured to regulate and control the power supply voltage input by the power supply input terminal VCC _ IN to output a voltage drop signal to the switch trigger circuit 102;
the switch trigger circuit 102 is configured to trigger operation of the control circuit 103 according to a voltage drop signal output by the voltage divider circuit 101;
the control circuit 103 is configured to process the voltage output by the switch trigger circuit 102 to output a high level or a low level.
In the above embodiment, the switch triggering circuit 102 may be implemented by an electronic switch such as a triode, a MOS transistor, etc., and is not limited herein.
IN this embodiment, the voltage dividing circuit 101 divides the power voltage input from the power input VCC _ IN of the under-voltage protection circuit, a voltage drop signal is generated IN the voltage dividing circuit 101 to control the conduction of the switch trigger circuit 102, and then the control circuit 103 processes the voltage output from the switch trigger circuit 102 to output a high level or a low level. It can be understood that, specifically, when the voltage drop signal output by the voltage dividing circuit 101 is greater than or equal to the preset voltage value of the switch trigger circuit 102, controlling the switch trigger circuit 102 to be turned on; when the voltage drop signal output by the voltage divider circuit 101 is smaller than the preset voltage value of the switch trigger circuit 102, the switch trigger circuit 102 is controlled to be turned off. The embodiment realizes the judgment of the power supply voltage input by the power supply input terminal VCC _ IN IN the undervoltage protection circuit.
IN an embodiment, the voltage divider circuit 101 is implemented by a circuit, where the voltage divider circuit 101 includes a first resistor R1 and a second resistor R2, a first end of the first resistor R1 is connected to the power input terminal VCC _ IN, a second end of the first resistor R1 is connected to a first end of the second resistor R2, and a second end of the second resistor R2 is grounded. It is understood that the first resistor R1 and the second resistor R2 IN the voltage divider circuit 101 divide the power voltage at the power input VCC _ IN, and generate a voltage drop signal IN the circuit after the voltage division, where the voltage drop signal can drive the switch trigger circuit 102 to be turned on or off.
It should be noted that, in the above embodiment, the first resistor R1 and the second resistor R2 may be arranged, so as to arbitrarily set the preset voltage value of the switch trigger circuit 102, that is, the preset voltage value of the voltage detection circuit 100 is arbitrarily set, for example, the preset voltage value may be set to 2.5V, 3V, 4.5V, and the like, which is not limited herein.
IN an embodiment, the switch trigger circuit 102 is implemented by a circuit, where the switch trigger circuit 102 includes a third resistor R3 and a first transistor Q1, a first end of the third resistor R3 is connected to the power input terminal VCC _ IN, a second end of the third resistor R3 is interconnected with an input terminal of the first transistor Q1, a controlled terminal of the first transistor Q1 is a controlled terminal of the switch trigger circuit 102, and an output terminal of the first transistor Q1 is an output terminal of the switch trigger circuit 102, and the control voltage is input to the control circuit 103 through the switch trigger circuit 102 for processing.
In one embodiment, the control circuit 103 includes a fourth resistor R4, a second capacitor C2, and a voltage control chip U1, a first terminal of the fourth resistor R4 is an input terminal of the control circuit 103, a second terminal of the fourth resistor R4, a first terminal of a second capacitor C2 and an input terminal of the voltage control chip U1 are interconnected, the second end of the second capacitor C2 is grounded, the output end of the voltage control chip U1 is the output end of the control circuit 103, the voltage output from the switch trigger circuit 102 is processed by the control circuit 103 to output a high level or a low level, it is understood that the control circuit 103 outputs a high level or a low level, specifically, when the control circuit 103 outputs a high level, the switch output circuit 200 is controlled to be turned on, when the control circuit 103 outputs a low level, the switch output circuit 200 is controlled to be turned off.
In one embodiment, the switch output circuit 200 is implemented by a circuit, the switch output circuit 200 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a second transistor Q2, and a third transistor Q3, a first end of the fifth resistor R5 is an input end of the switch output circuit, a second end of the fifth resistor R5 is connected with a controlled end of the second triode Q2, the input end of the second triode Q2 is connected with the second end of the sixth resistor R6, the output end of the second triode Q2 is grounded, a first terminal of the sixth resistor R6, a second terminal of the seventh resistor R7 and a controlled terminal of the third transistor Q3 are interconnected, a first end of the seventh resistor R7 is connected to an input terminal of the third transistor Q3, and an output terminal of the third transistor Q3 is connected to the power output terminal VCC _ OUT.
IN this embodiment, when the voltage detection circuit 100 outputs a high level signal, the second transistor Q2 is controlled to be turned on, and after the second transistor Q2 is turned on, the third transistor Q3 is controlled to be turned on, and at this time, the power input terminal VCC _ IN of the under-voltage protection circuit is turned on with the third transistor Q3, so that the power voltage input by the power input terminal VCC _ IN is output to the power output terminal VCC _ OUT to supply power to the load; when the voltage detection circuit 100 outputs a low level signal, the second transistor Q2 and the third transistor Q3 are not turned on, and at this time, the power input terminal VCC _ IN of the under-voltage protection circuit and the third transistor Q3 are cut off. The embodiment realizes the connection and disconnection between the power input end VCC _ IN and the power output end VCC _ OUT.
IN an embodiment, as shown IN fig. 1, the under-voltage protection circuit further includes a first capacitor C1, a first end of the first capacitor C1 is connected to the power input terminal VCC _ IN, and a second end of the first capacitor C1 is grounded, and IN this embodiment, the first capacitor C1 is provided to filter the power voltage input from the power input terminal VCC _ IN of the under-voltage protection circuit.
In an embodiment, as shown in fig. 1, the under-voltage protection circuit further includes a third capacitor C3, a first end of the third capacitor C3 is connected to the power output terminal VCC _ OUT, and a second end of the third capacitor C3 is grounded, it can be understood that there is a hysteresis phenomenon in the voltage required to recover to the load after the under-voltage protection, and the third capacitor C3 is provided to store energy, so that frequent switching when the power supply voltage is at the predetermined voltage critical point can be prevented.
The utility model also provides a battery device, this battery device include the battery and as above under-voltage protection circuit, the battery output of battery with under-voltage protection circuit's power input end is connected, voltage detection circuit's input with power input end connects, voltage detection circuit's output with switch output circuit's controlled end is connected, switch output circuit's input with power input end connects, switch output circuit's output with power output end connects. The specific structure of the battery device refers to the above embodiments, and since the battery device adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (9)
1. An undervoltage protection circuit is applied to a storage battery and is characterized by comprising a power supply input end, a voltage detection circuit, a switch output circuit and a power supply output end;
the power supply input end is used for being connected with a battery output end of a storage battery, the input end of the voltage detection circuit is connected with the power supply input end, the output end of the voltage detection circuit is connected with a controlled end of the switch output circuit, the input end of the switch output circuit is connected with the power supply input end, and the output end of the switch output circuit is connected with the power supply output end;
the voltage detection circuit is used for outputting a first control signal when detecting that the power supply voltage of the power supply input end is greater than or equal to a preset voltage, and outputting a second control signal when detecting that the power supply voltage of the power supply input end is less than the preset voltage;
the switch output circuit is used for being turned on according to the first control signal, outputting the power supply voltage input by the power supply input end to the power supply output end, and being turned off according to the second control signal, and cutting off the power supply voltage output by the power supply input end to the power supply output end.
2. The under-voltage protection circuit of claim 1, wherein the voltage detection circuit comprises a voltage divider circuit, a switch trigger circuit, and a control circuit, wherein a first terminal of the voltage divider circuit and an input terminal of the switch trigger circuit are respectively connected to the power input terminal, a second terminal of the voltage divider circuit is connected to a controlled terminal of the switch trigger circuit, an output terminal of the switch trigger circuit is connected to an input terminal of the control circuit, and an output terminal of the control circuit is an output terminal of the voltage detection circuit;
the voltage division circuit is used for regulating and controlling the power supply voltage input by the power supply input end so as to output a voltage drop signal to the switch trigger circuit;
the switch trigger circuit is used for triggering the operation of the control circuit according to the voltage drop signal output by the voltage division circuit;
and the control circuit is used for processing the voltage output by the switch trigger circuit to output a high level or a low level.
3. The undervoltage protection circuit of claim 2, wherein the voltage divider circuit comprises a first resistor and a second resistor, a first end of the first resistor is connected to the power input terminal, a second end of the first resistor is connected to a first end of the second resistor, and a second end of the second resistor is connected to ground.
4. The undervoltage protection circuit of claim 2, wherein the switch trigger circuit comprises a third resistor and a first transistor, a first terminal of the third resistor is connected to the power input terminal, a second terminal of the third resistor is interconnected to an input terminal of the first transistor, a controlled terminal of the first transistor is a controlled terminal of the switch trigger circuit, and an output terminal of the first transistor is an output terminal of the switch trigger circuit.
5. The undervoltage protection circuit of claim 2, wherein the control circuit comprises a fourth resistor, a second capacitor, and a voltage control chip, wherein a first terminal of the fourth resistor is an input terminal of the control circuit, a second terminal of the fourth resistor, a first terminal of the second capacitor, and an input terminal of the voltage control chip are interconnected, a second terminal of the second capacitor is grounded, and an output terminal of the voltage control chip is an output terminal of the control circuit.
6. The undervoltage protection circuit of claim 1, wherein the switching output circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, a second transistor, and a third transistor, wherein a first end of the fifth resistor is an input end of the switching output circuit, a second end of the fifth resistor is connected to a controlled end of the second transistor, an input end of the second transistor is connected to a second end of the sixth resistor, an output end of the second transistor is grounded, a first end of the sixth resistor, a second end of the seventh resistor, and a controlled end of the third transistor are interconnected, a first end of the seventh resistor is connected to an input end of the third transistor, and an output end of the third transistor is connected to the power output end.
7. The undervoltage protection circuit of any of claims 1-6, further comprising a first capacitor, a first end of the first capacitor connected to the power input, and a second end of the first capacitor connected to ground.
8. The undervoltage protection circuit of any of claims 1-6, further comprising a third capacitor, a first end of the third capacitor connected to the power output terminal, and a second end of the third capacitor connected to ground.
9. A battery device, characterized in that the battery device comprises a storage battery and the undervoltage protection circuit of any of claims 1-8, and the battery output end of the storage battery is connected with the power input end of the undervoltage protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920481254.8U CN209963741U (en) | 2019-04-08 | 2019-04-08 | Undervoltage protection circuit and battery device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920481254.8U CN209963741U (en) | 2019-04-08 | 2019-04-08 | Undervoltage protection circuit and battery device |
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| CN209963741U true CN209963741U (en) | 2020-01-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114567837A (en) * | 2022-02-28 | 2022-05-31 | 歌尔微电子股份有限公司 | Sensor microphone output protection circuit and sensor microphone |
| CN116400127A (en) * | 2023-06-09 | 2023-07-07 | 拓尔微电子股份有限公司 | Undervoltage detection circuit, power management chip and undervoltage detection method |
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2019
- 2019-04-08 CN CN201920481254.8U patent/CN209963741U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114567837A (en) * | 2022-02-28 | 2022-05-31 | 歌尔微电子股份有限公司 | Sensor microphone output protection circuit and sensor microphone |
| CN114567837B (en) * | 2022-02-28 | 2024-04-26 | 歌尔微电子股份有限公司 | Sensor microphone output protection circuit and sensor microphone |
| CN116400127A (en) * | 2023-06-09 | 2023-07-07 | 拓尔微电子股份有限公司 | Undervoltage detection circuit, power management chip and undervoltage detection method |
| CN116400127B (en) * | 2023-06-09 | 2023-09-05 | 拓尔微电子股份有限公司 | Undervoltage detection circuit, power management chip and undervoltage detection method |
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