Voltage determination circuit

Abstract

The present invention discloses a voltage determination circuit including a voltage supply unit that supplies a predetermined voltage, a first switch that receives the supply voltage and switches in accordance with a first threshold voltage, a second switch that receives the supply voltage and switches in accordance with a second threshold voltage, and a third switch that receives an output of the second switch and switches in accordance with a third threshold voltage.

Description

[Technical Field]

[0001] The present invention relates to a voltage determination circuit, and more particularly to a voltage determination circuit capable of determining whether or not there is an abnormality in the voltage output from a voltage supply unit. [Background technology]

[0002] Rechargeable secondary batteries, or batteries, are widely used as an energy source for mobile devices such as smartphones. Furthermore, batteries are also used as an energy source for environmentally friendly vehicles such as electric vehicles and hybrid vehicles, which are presented as solutions to address air pollution caused by fossil fuel-using gasoline and diesel vehicles. The types of applications for batteries are extremely diverse, and it is expected that batteries will be supplied to even more fields and products in the future.

[0003] Electrical and electronic equipment that uses batteries as power must be equipped with a Battery Management System (BMS) to control the battery's operation. The BMS monitors the battery's state, such as temperature, voltage, and current, and based on the monitored state, it can control charging or discharging through battery balancing and estimation of the State of Charge (SOC). Such a BMS may include a Battery Monitoring IC (BMIC) for monitoring the battery's state and a Main Control Unit (MCU) for controlling the battery according to its state. The BMIC measures state information such as voltage, current, and temperature of the battery, generates a diagnostic signal from the measured state information, and transmits it to the Main Control Unit (MCU). The MCU receives the diagnostic signal from the BMIC, monitors the battery's state, and can control the battery according to its state.

[0004] On the other hand, if the battery voltage is lower or higher than the set voltage, the power supplied from the battery to electrical / electronic equipment must be controlled. That is, when a voltage diagnosis is made, such as an under-cell voltage (lower than the set voltage) or an over-cell voltage (higher than the set voltage), a predetermined control signal is output to control the battery's functions. For example, if a battery that maintains a voltage of 3V to 4.1V outputs a voltage of 4.5V, the voltage detection unit diagnoses this as an over-cell voltage (higher than the set voltage) and outputs a predetermined control signal. Based on this control signal, functions such as communication are controlled to stop the battery's operation.

[0005] Conventionally, a voltage detection unit that determines whether or not there is an abnormality in the battery voltage was incorporated into the MCU or BMIC, and the MCU or BMIC determined the battery voltage internally and output a control signal. Here, the voltage detection unit implemented within the MCU or BMIC is implemented by software. However, in this conventional method, because the voltage detection unit is implemented by software within the MCU or BMIC, it is dependent on the MCU or BMIC, and various countermeasures for malfunctions are required, which leads to a surge in the price of the MCU or BMIC.

[0006] Examples of such conventional technologies include the following patent documents. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Republic of Korea Publication Patent No. 10-2021-0092013 [Overview of the project] [Problems that the invention aims to solve]

[0008] The present invention provides a voltage determination circuit capable of determining whether or not there is an abnormality in the voltage supplied from a voltage supply unit.

[0009] The present invention provides a voltage determination circuit that can determine whether or not there is an abnormality in the supply voltage using a predetermined circuit.

[0010] The present invention provides a voltage determination circuit that can determine whether or not there is a voltage abnormality within an MCU or BMIC, and can also determine whether or not there is a voltage abnormality using a predetermined circuit. [Means for solving the problem]

[0011] A voltage determination circuit according to one aspect of the present invention comprises: a voltage supply unit that supplies a predetermined voltage; a first switch that receives the supply voltage and switches according to a first threshold voltage; a second switch that receives the supply voltage and switches according to a second threshold voltage; and a third switch that receives the output of the second switch and switches according to a third threshold voltage.

[0012] The outputs of the first and third switches are output to the output terminals, and the output of the second switch is output to the input of the third switch.

[0013] The first and third switches are P-channel metal oxide semiconductor field-effect transistors (P-MOSEFETs), and the second switch is an N-channel metal oxide semiconductor field-effect transistor (N-MOSEFET).

[0014] The first to third threshold voltages are different.

[0015] The first to third threshold voltages are adjusted according to the range of the set voltage.

[0016] The first threshold voltage is smaller than the lower limit of the set voltage range, the third threshold voltage is a predetermined voltage within the set voltage range, and the second threshold voltage is larger than the upper limit of the set voltage range.

[0017] A voltage determination circuit according to another aspect of the present invention includes a voltage supply unit that supplies a predetermined voltage, a first voltage determination unit that primarily determines the range of the supply voltage and the set voltage and outputs it to an output terminal, and a second voltage determination unit that secondarily determines the range of the supply voltage and the set voltage using the supply voltage and the output signal of the first voltage determination unit and outputs it to the output terminal.

[0018] The voltage supply unit includes a battery including a plurality of rechargeable battery cells.

[0019] The first voltage determination unit is realized by either a BMIC for monitoring the state of the battery or an MCU for controlling the battery according to the state of the battery.

[0020] The second voltage determination unit is provided in a predetermined area of the BMS excluding the BMIC and the MCU.

[0021] The output level of the output terminal is determined by adding the levels of the first output signal and the second output signal.

[0022] The output terminal maintains a low level when the supply voltage is within the set voltage range and maintains a high level when the supply voltage is outside the set voltage range.

[0023] The second voltage determination unit includes a first switch that receives the supply voltage and switches according to a first threshold voltage, a second switch that receives the supply voltage and switches according to a second threshold voltage, and a third switch that receives the output of the second switch and switches according to a third threshold voltage.

[0024] The first and third switches are output to an output terminal, and the second switch is output to an input of the third switch.

[0025] The first and third switches are P-MOSFETs, and the second switch is an N-MOSFET.

[0026] The first to third threshold voltages are different.

[0027] The first to third threshold voltages are adjusted according to the range of the set voltage.

[0028] The first threshold voltage is smaller than the lower limit of the range of the set voltage, the second threshold voltage is larger than the upper limit of the range of the set voltage, and the third threshold voltage is a predetermined voltage within the range of the set voltage.

Advantages of the Invention

[0029] In the present invention, a supply voltage from a voltage supply unit is applied to a first voltage determination unit, and the first voltage determination unit primarily determines whether the supply voltage is within a range of a set voltage and outputs a signal of a predetermined level to an output terminal. Further, a second voltage determination unit receives the supply voltage of the voltage supply unit and an output signal based on a determination result in the first voltage determination unit, secondarily determines whether the supply voltage is out of the range of the set voltage, and outputs a signal of a predetermined level to the output terminal. At this time, the second voltage determination unit includes a plurality of switches, and the range of the set voltage can be adjusted by adjusting the threshold voltages of the switches.

[0030] Therefore, in the present invention, since the second voltage determination unit is not realized in the MCU or BMIC and is realized in hardware, there is an advantage that the process of determining the presence or absence of an abnormal voltage is simple. In addition, since the second voltage determination unit is not realized in the MCU or BMIC and is realized in hardware, it is not dependent on the MCU or BMIC, various countermeasures against defects are not required, and thus the price of the MCU or BMIC can be reduced compared with the prior art. [Brief explanation of the drawing]

[0031] [Figure 1] This is a block diagram of a voltage determination circuit according to one embodiment of the present invention. [Figure 2] This is a block diagram of a voltage determination circuit according to one embodiment of the present invention. [Figure 3] This is a circuit diagram of a voltage detection circuit according to one embodiment of the present invention. [Modes for carrying out the invention]

[0032] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. However, the present invention is not limited in any way to the embodiments disclosed below and can be embodied in a variety of different forms. These embodiments are provided to carry out the disclosure of the present invention and to adequately inform those who have ordinary skill in the scope of the invention.

[0033] Figures 1 and 2 are block diagrams illustrating the configuration of a voltage determination circuit according to one embodiment of the present invention, and Figure 3 is a circuit diagram of the voltage determination circuit according to one embodiment of the present invention.

[0034] Referring to Figures 1 to 3, a voltage determination circuit according to one embodiment of the present invention may include a voltage supply unit 100 that supplies a power supply of a predetermined voltage, a first voltage determination unit 200 that determines whether the voltage supplied from the voltage supply unit 100 is within a set voltage, and a second voltage determination unit 300 that uses the voltage supplied from the voltage supply unit 100 and the output signal of the first voltage determination unit 200 to determine whether the voltage supplied from the voltage supply unit 100 is within a set voltage. That is, the first voltage determination unit 200 first determines whether the supplied voltage is within a set voltage, and the second voltage determination unit 300 secondarily determines whether the supplied voltage is within a set voltage using the determination result of the first voltage determination unit 200 and the supplied voltage. Here, the first voltage determination unit 200 may be implemented in software, and the second voltage determination unit 300 may be implemented in hardware. Therefore, the degree of dependence on software can be reduced, and the presence or absence of abnormalities in the supplied voltage can be determined stably. A more detailed explanation of each component of the voltage determination circuit according to this embodiment of the present invention is as follows.

[0035] The voltage supply unit 100 supplies power at a predetermined voltage. Such a voltage supply unit 100 may include a rechargeable battery. Needless to say, in addition to the battery, the voltage supply unit 100 may include a device that supplies power at a predetermined voltage. For example, it may include a power supply device that receives an external AC power supply and generates and supplies a predetermined DC voltage required for the internal operation of electrical / electronic equipment. The battery is rechargeable and dischargeable and can provide electrical energy at a predetermined voltage required for the operation of electrical / electronic equipment. That is, the battery can be charged to store a predetermined capacity of electrical energy and discharged to provide electrical energy for the operation of electrical / electronic equipment. Such a battery may include multiple battery modules, and each battery module may include multiple rechargeable battery cells. That is, it may include multiple battery cells, and multiple battery cells may be bundled together in a predetermined unit to form a battery module, or multiple battery modules may form a single battery. On the other hand, the multiple battery cells may be connected in series and / or parallel in various ways to suit the specifications of the electrical / electronic equipment. Needless to say, multiple battery packs, each comprising multiple battery cells, may also be connected in series and / or parallel. Here, the type of battery cells is not particularly limited and can consist of, for example, lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, and the like.

[0036] The first voltage determination unit 200 can determine whether the voltage supplied from the voltage supply unit 100 is within a set voltage range and generate a control signal. That is, the first voltage determination unit 200 can compare the voltage supplied from the voltage supply unit 100 with a set voltage and output the result of the comparison. The first voltage determination unit 200 can compare the supply voltage and the set voltage and output signals of different levels depending on the result of the comparison. For example, if the supply voltage is within the range of the set voltage, the first voltage determination unit 200 outputs a low-level signal, and if the supply voltage is outside the range of the set voltage, it outputs a high-level signal. As a specific example, the supply voltage from the voltage supply unit 100 may be set to 3V to 4.2V, and the first voltage determination unit 200 can determine whether the voltage supplied from the voltage supply unit 100 is within the range of 3V to 4.2V. The first voltage determination unit 200 can output a low-level signal when the supply voltage is within the range of 3V to 4.2V, and a high-level signal when it is less than 3V or greater than 4.2V. On the other hand, if the voltage supply unit 100 is a battery, such a first voltage determination unit 200 may be part of a BMS. That is, the BMS monitors the state of the battery, such as temperature, voltage, and current, and can control the battery, such as balancing the battery or charging or discharging it by estimating the State of Charge (SOC), based on the monitored state of the battery. Such a BMS may include a BMIC (Battery Monitoring IC) for monitoring the state of the battery and an MCU for controlling the battery according to the state of the battery. The BMIC measures state information such as voltage, current, and temperature for the battery, generates a diagnostic signal from the measured state information, and transmits it to the MCU. The MCU receives the diagnostic signal from the BMIC, monitors the state of the battery, and can control the battery according to the state of the battery. In this case, the first voltage determination unit 200 may be provided in the BMIC or in the MCU. Furthermore, the first voltage determination unit 200 may be implemented in software.On the other hand, a first diode D11 may be provided between the first voltage determination unit 200 and the output terminal OUT.

[0037] The second voltage determination unit 300 determines whether the voltage supplied from the voltage supply unit 100 is outside a set voltage range and outputs a predetermined control signal. The second voltage determination unit 300 may also be implemented in a predetermined area of ​​the BMS excluding the BMIS and MCU. Such a second voltage determination unit 200 may include a plurality of switches 310, 320, and 330, and each of the switches may include a transistor with a different threshold voltage. For example, as shown in Figure 2, it may include a first switch 310 whose gate terminal is connected to the output terminal of the voltage supply unit 100 and whose drain terminal is connected to the output terminal OUT, a second switch 320 whose gate terminal is connected to the output terminal of the voltage supply unit 100 and whose source terminal is connected to the output terminal OUT, and a third switch 330 whose gate terminal is connected to the output terminal of the second switch 320 and whose source terminal is connected to the output terminal OUT. Here, the first switch 310 may be a P-MOSFET, the second switch 320 may be an N-MOSFET, and the third switch 330 may be a P-MOSFET. The gate terminal of the first switch 310 (i.e., the first P-MOSFET) is connected to the output terminal of the voltage supply unit 100, the source terminal is connected to the 5V power supply terminal, and the drain terminal is connected to the output terminal OUT. The gate terminal of the second switch 320 (i.e., the N-MOSFET) is connected to the output terminal of the voltage supply unit 100, the source terminal is connected to the output terminal OUT, and the drain terminal is connected to the gate terminal of the third switch 330 (i.e., the second P-MOSFET). The gate terminal of the third switch 330 (i.e., the second P-MOSFET) is connected to the drain terminal of the second switch 3200, the source terminal is connected to the 5V power supply terminal, and the drain terminal is connected to the output terminal OUT. Here, the first to third switches 310, 320, and 330 may have different threshold voltages. Two of the first to third switches 310, 320, and 330 may have threshold voltages for the lower and upper limits of the set voltage range, while the remaining one may have a threshold voltage lower than the lower limit of the set voltage range.For example, the first switch 310 may have a threshold voltage of 2V, the second switch 320 may have a threshold voltage of 4.2V, and the third switch 330 may have a threshold voltage of 3V. The first switch 310 has a first threshold voltage (2V), accepts the output voltage from the voltage supply unit 100 as its gate voltage, and outputs a signal to the output terminal OUT based on the difference between the source voltage (Vs1) and the gate voltage (Vg1). If the difference is greater than the first threshold voltage, it outputs a high-level signal. The second switch 320 has a second threshold voltage (4.2V), accepts the output voltage from the voltage supply unit 100 as its gate voltage, and outputs a signal to the gate of the third switch 330 based on the difference between the source voltage (Vs2) and the gate voltage (Vg2). The third switch 330 has a third threshold voltage (3V), accepts the drain voltage (Vd) of the second switch 320 as its gate voltage, compares the difference between the source voltage (Vs3) and the gate voltage (Vg3) with the third threshold voltage, and outputs the resulting signal to the output terminal OUT. The second voltage determination unit 200, having this configuration, outputs a low-level signal to the output terminal OUT if the voltage supplied from the voltage supply unit 100 is within the set voltage range, and outputs a high-level signal to the output terminal OUT if it is outside the set voltage range. In this way, by having multiple switches have threshold voltages within the set voltage range and threshold voltages lower than the lower limit voltage of the set voltage, it is possible to sense when the voltage from the voltage supply unit 100 is outside the set voltage. Furthermore, if the set voltage is changed, the threshold voltage of the switch can be changed, so it is possible to respond to changes in the set voltage. On the other hand, a second diode D12 may be provided between the drain terminal and output terminal OUT of the first switch 310, and a third diode D13 may be provided between the drain terminal and output terminal OUT of the third switch 330. Furthermore, a first resistor R11 may be provided between the drain terminal and the 5V power supply terminal of the second switch 320, and a second resistor R12 may be provided between the source terminal and output terminal OUT of the second switch 320.

[0038] The method for driving the voltage judgment circuit of the present invention described above can be explained using a set voltage of 3V to 4.2V as an example, as follows. That is, electrical / electronic equipment can operate normally within the voltage range of 3V to 4.2V supplied from the voltage supply unit, and can notify fault conditions or control functions in other voltage ranges. In this case, the cases in which the voltage supply unit supplies voltages of 2V, 3.7V, and 5V, respectively, in a circuit that operates normally within the set voltage range of 3V to 4.2V will be explained.

[0039] First, when a 2V voltage is output from the voltage supply unit 100, it is input to the first voltage determination unit 200, which compares it with a set voltage of 3V to 4.2V and determines that it is outside the set voltage range, outputting a high-level signal. At the same time, the 2V voltage is input to the second voltage determination unit 300, and the first switch 310 receives the 2V voltage as input to its gate terminal. At this time, the first switch 310 is turned on because a 5V power supply voltage is applied to the source terminal and a 2V voltage is applied to the gate terminal, so the difference between the source voltage (Vs1) and the gate voltage (Vg1) is 3V, which is higher than the threshold voltage of 2V (Vs1-Vg1=3V>V). th Therefore, the drain terminal of the first switch 310 becomes high level. Also, a voltage of 2V is applied to the gate terminal of the second switch 320, and the difference between the gate voltage (Vg2) and the source voltage (Vs2) is 2V, but since the threshold voltage is 4.2V, the difference between the gate voltage (Vg2) and the source voltage (Vs2) is lower than the threshold voltage (Vg2-Vs2=2V). <V th Therefore, the second switch 320 is turned off, and the drain terminal remains at a high level (5V). Because the drain terminal of the second switch 320 remains at a high level (5V), a high-level (5V) signal is applied to the gate terminal of the third switch 330. Therefore, the difference between the source voltage (Vs3) and the gate voltage (Vg3) of the third switch 330 is 0V, which is lower than the threshold voltage (Vs3-Vg3=0V). <V th), the third switch 330 is turned off. As a result, the second voltage determination unit 300 outputs a high-level signal applied to the drain terminal of the first switch 310. However, because the first voltage determination unit 200 outputs a high-level signal, the output terminal OUT remains at a high level. Consequently, the output terminal OUT of the voltage determination circuit according to the present invention becomes high level, which indicates that the supply voltage from the voltage supply unit 100 is being supplied as an abnormal signal.

[0040] When a voltage of 3.7V is output from the voltage supply unit 100, it is input to the first voltage determination unit 200, which compares it with a set voltage of 3V to 4.2V and determines that the voltage is within the set voltage range, then outputs a low-level signal. At the same time, the 3.7V voltage is applied to the second voltage determination unit 300, and the first switch 310 receives the 3.7V voltage as input to its gate terminal. At this time, the first switch 310 has a 5V power supply voltage applied to its source terminal and a 3.7V voltage applied to its gate terminal, so the difference between the source voltage (Vs1) and the gate voltage (Vg1) is 1.3V, which is lower than the threshold voltage of 2V, and therefore the first switch is turned off (Vs1-Vg1=1.3V). <V th Therefore, the drain terminal of the first switch 310 is at a low level. Also, a voltage of 3.7V is applied to the gate terminal of the second switch 320, and the difference between the gate voltage (Vg2) and the source voltage (Vs2) is 3.7V, but since the threshold voltage is 4.2V, the difference between the gate voltage (Vg2) and the source voltage (Vs2) is lower than the threshold voltage (Vg2-Vs2=3.7V). <V th Therefore, the second switch 320 is turned off, and the drain terminal remains at a high level (5V). Because the drain terminal of the second switch 320 remains at a high level (5V), a high-level (5V) signal is applied to the gate terminal of the third switch 330. Therefore, the difference between the source voltage (Vs3) and the gate voltage (Vg3) of the third switch 330 is 0V, which is lower than the threshold voltage (Vs3-Vg3=0V). <V th) The third switch 330 is turned off. Eventually, the second voltage determination unit 300 outputs a low-level signal. However, since the first voltage determination unit 200 outputs a low-level signal, the output terminal OUT will maintain a low level. Eventually, the output of the voltage determination circuit becomes low level, which determines that the supply voltage of the voltage supply unit 100 is supplied as a normal signal.

[0041] A 5V voltage is supplied from the voltage supply unit 100 and applied to the first voltage determination unit 200. The first voltage determination unit 200 determines that it is out of the set voltage range of 3V to 4.2V and outputs a high-level signal. At the same time, the 5V voltage is applied to the second voltage determination unit 300, and the first switch 310 receives the 5V voltage as an input to its gate terminal. At this time, for the first switch 310, a 5V power supply voltage is applied to its source terminal and a 5V voltage is applied to its gate terminal. Therefore, the difference between the source voltage (Vs1) and the gate voltage (Vg1) is 0V, which is lower than the threshold voltage of 2V. Thus, the first switch is turned off (Vs1 - Vg1 = 0V < V th ). Also, for the second switch 320, a 5V voltage is applied to its gate terminal, and the difference between the gate voltage (Vg2) and the source voltage (Vs2) is 5V. Since the threshold voltage is 4.2V, the difference between the gate voltage (Vg2) and the source voltage (Vs2) is higher than the threshold voltage (Vg2 - Vs2 = 5V > V th ). Therefore, the second switch 320 is turned on, and its drain terminal maintains a low level. Since the drain terminal of the second switch 320 maintains a low level, a low-level signal is applied to the gate terminal of the third switch 330. Therefore, for the third switch 330, the difference between the source voltage (Vs3) and the gate voltage (Vg3) is 5V, which is higher than the threshold voltage (Vs3 - Vg3 = 5V > V th), the third switch 330 is turned on, and the drain terminal maintains a high level. Consequently, the second voltage determination unit 330 outputs a high-level signal. At this time, because the first voltage determination unit 200 outputs a high-level signal, the output terminal OUT maintains a high level. Consequently, the output of the voltage determination circuit becomes high level, which indicates that the supply voltage from the voltage supply unit 100 is being supplied as an abnormal signal.

[0042] As described above, in the present invention, a predetermined voltage is applied from the voltage supply unit 100 to the first voltage determination unit 200, and the first voltage determination unit 200 first determines whether the supply voltage is within the range of a set voltage and outputs a signal of a predetermined level to the output terminal OUT. The second voltage determination unit 300 receives the supply voltage from the voltage supply unit 100 and the output signal based on the determination result of the first voltage determination unit 200, and second determines whether the supply voltage is outside the range of the set voltage and outputs a signal of a predetermined level to the output terminal OUT. For example, the first voltage determination unit 200 outputs a low-level signal if the voltage from the voltage supply unit 100 is within the range of the set voltage, and outputs a high-level signal if it is outside the range of the set voltage. The second voltage determination unit 200 outputs a low-level signal if the voltage from the voltage supply unit 100 is within the range of the set voltage, and outputs a high-level signal if it is outside the range of the set voltage. The output terminal OUT maintains a low or high level based on the output signals of the first and second voltage determination units 200 and 300. At this time, the threshold voltage of switches 310, 320, and 330 of the second voltage determination unit 300 can be adjusted to adjust the range of the set voltage. Therefore, the present invention has the advantage that the process of determining whether or not there is a voltage abnormality is simple because the second voltage determination unit is not implemented in the MCU or BMIC but is implemented in hardware. Furthermore, because the second voltage determination unit is not implemented in the MCU or BMIC but is implemented in hardware, it is not dependent on the MCU or BMIC, and various countermeasures for malfunctions are unnecessary, so the price of the MCU or BMIC can be reduced compared to conventional systems.

[0043] In other words, the present invention implements a hardware-based configuration that performs self-diagnosis via a signal output circuit based on a voltage range, thereby reducing the dependence on software compared to conventional technologies that performed diagnosis using software methods of MCUs and BMICs. This makes it possible to prepare for abnormalities in MCUs and BMICs.

[0044] While the technical concept of the present invention has been described in detail based on the above embodiments, it should be noted that these embodiments are for illustrative purposes only and are not limiting. Furthermore, those skilled in the art will understand that various embodiments are possible within the scope of the technical concept of the present invention.

[0045] The reference numerals used in the drawings for this invention are as follows: [Explanation of symbols]

[0046] 100...Voltage supply unit 200...First voltage determination unit 300...Second voltage determination unit 310, 320, 330… First, second, and third switches

Claims

1. A voltage supply unit that supplies a predetermined voltage, A first switch configured to receive a supply voltage, output a high-level signal when the supply voltage is lower than the lower limit of a set voltage range, and output a low-level signal when the supply voltage is higher than the lower limit of the set voltage range, wherein the output of the first switch is connected to an output terminal, A second switch is configured to receive the supply voltage and output a high-level signal to a third switch when the supply voltage is lower than the upper limit of the set voltage range, and to output a low-level signal to the third switch when the supply voltage is higher than the upper limit of the set voltage range. A third switch is configured to receive the output of the second switch, output a low-level signal when the output of the second switch is high-level, and output a high-level signal when the output of the second switch is low-level, wherein the output of the third switch is connected to an output terminal, and the third switch is connected to the output terminal. A voltage determination circuit equipped with this.

2. The first switch described above is The power supply voltage is then received, The device is turned on when the difference between the power supply voltage and the supply voltage is higher than the first threshold voltage. The system is configured to turn off when the difference between the power supply voltage and the supply voltage is lower than the first threshold voltage. The second switch is, The system is turned on when the supply voltage is higher than the second threshold voltage. The system is configured to turn off when the supply voltage is lower than the second threshold voltage. The third switch is, The second switch is turned on when the output voltage from the second switch is lower than the third threshold voltage. The voltage determination circuit according to claim 1, configured to turn off when the output voltage from the second switch is higher than a third threshold voltage.

3. The voltage determination circuit according to claim 2, wherein the first and third switches are P-channel metal-oxide-semiconductor field-effect transistors (P-MOSFETs), and the second switch is an N-channel metal-oxide-semiconductor field-effect transistor (N-MOSFET).

4. The voltage determination circuit according to claim 3, wherein the first to third threshold voltages are different from each other.

5. The voltage determination circuit according to claim 4, wherein the first to third threshold voltages are adjusted according to a set voltage range.

6. The voltage determination circuit according to claim 5, wherein the first threshold voltage is less than the lower limit of the set voltage range, the second threshold voltage is equal to the upper limit of the set voltage range, and the third threshold voltage is a predetermined voltage within the set voltage range.

7. A voltage supply unit that supplies a predetermined voltage, A first voltage determination unit that determines the range between the supply voltage and the set voltage and outputs a first output signal to the output terminal, A second voltage determination unit comprising multiple switches, which outputs a second output signal to the output terminal based on the operation of the multiple switches in accordance with the supply voltage, Equipped with, The aforementioned multiple switches A first switch configured to receive the supply voltage, output a high-level signal when the supply voltage is lower than the lower limit of a set voltage range, and output a low-level signal when the supply voltage is higher than the lower limit of the set voltage range, wherein the output of the first switch is connected to an output terminal, and A second switch is configured to receive the supply voltage and output a high-level signal to a third switch when the supply voltage is lower than the upper limit of the set voltage range, and to output a low-level signal to the third switch when the supply voltage is higher than the upper limit of the set voltage range. A third switch is configured to receive the output of the second switch, output a low-level signal when the output of the second switch is high-level, and output a high-level signal when the output of the second switch is low-level, wherein the output of the third switch is connected to an output terminal, and A voltage-determining circuit, including one.

8. The voltage determination circuit according to claim 7, wherein the voltage supply unit comprises a battery having a plurality of chargeable and dischargeable battery cells.

9. The voltage determination circuit according to claim 8, wherein the first voltage determination unit is implemented in either a battery monitoring IC (BMIC) for monitoring the state of the battery or a main control unit (MCU) for controlling the battery according to the state of the battery.

10. The voltage determination circuit according to claim 9, wherein the second voltage determination unit is provided in a predetermined area of ​​the battery management system (BMS) excluding the battery monitoring IC (BMIC) and the main control unit (MCU).

11. The voltage determination circuit according to claim 7, wherein the output level of the output terminal is determined by summing the levels of the first output signal and the second output signal.

12. The voltage determination circuit according to claim 11, wherein the output terminal maintains a low level when the supply voltage is within the range of a set voltage, and maintains a high level when the supply voltage is outside the range of a set voltage.

13. The first switch described above is The power supply voltage is then received, The device is turned on when the difference between the power supply voltage and the supply voltage is higher than the first threshold voltage. The system is configured to turn off when the difference between the power supply voltage and the supply voltage is lower than the first threshold voltage. The second switch is, The system is turned on when the supply voltage is higher than the second threshold voltage. The system is configured to turn off when the supply voltage is lower than the second threshold voltage. The third switch is, The second switch is turned on when the output voltage from the second switch is lower than the third threshold voltage. The voltage determination circuit according to claim 7, configured to turn off when the output voltage from the second switch is higher than a third threshold voltage.

14. The voltage determination circuit according to claim 13, wherein the first and third switches are P-channel metal-oxide-semiconductor field-effect transistors (P-MOSFETs), and the second switch is an N-channel metal-oxide-semiconductor field-effect transistor (N-MOSFET).

15. The voltage determination circuit according to claim 14, wherein the first to third threshold voltages are different from each other.

16. The voltage determination circuit according to claim 15, wherein the first to third threshold voltages are adjusted according to a set voltage range.

17. The voltage determination circuit according to claim 16, wherein the first threshold voltage is less than the lower limit of the set voltage range, the third threshold voltage is a predetermined voltage within the set voltage range, and the second threshold voltage is equal to the upper limit of the set voltage range.

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