Band-pass voltage detection circuit and energy storage system

Abstract

The invention relates to the technical field of power supplies, and mainly provides a band-pass voltage detection circuit and an energy storage system, the circuit comprises a first voltage division module, a first voltage stabilizer connected with the first voltage division module, a second voltage division module and a second voltage stabilizer which are connected with the first voltage stabilizer, and a voltage division module connected with the second voltage stabilizer, the switch module is also connected with a reference power supply. The first voltage division module is used for performing voltage division on the power supply and providing a first voltage division signal to the first voltage stabilizer so as to control the first voltage stabilizer to be switched on or switched off; the second voltage stabilizer is used for being cut off when the first voltage stabilizer is switched on, and when the first voltage stabilizer is cut off, the second voltage dividing module provides a second voltage dividing signal to be cut off or switched on; and after the control switch module is switched on, the reference power supply control switch module is matched to output high-low signals to judge whether the power supply is in a band-pass range or not. Therefore, the situation of load abnormity caused by too large or too small output voltage of the power supply is avoided, and the reliability of the energy storage system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power supplies, and in particular to a pass-through voltage detection circuit and an energy storage system. Background Art

[0002] In modern electronic devices and power systems, the stability and reliability of power supply play a vital role in the normal operation of the system. Among them, voltage monitoring is one of the key links to ensure the quality of power supply, especially in application scenarios involving passband voltage range. In order to realize the monitoring and control of voltage, traditional methods usually need to rely on integrated circuits (ICs) for control operations. However, the use of ICs not only increases material costs, but also increases labor costs. For many applications, these additional costs will reduce the competitiveness of products, especially in the field of consumer electronics where cost control requirements are high. This cost increase may affect the market share of products.

[0003] When monitoring the passband voltage, if the input voltage is too high, if it cannot be identified and judged in a timely and accurate manner, various components in the system may be subjected to excessive voltage stress, resulting in component damage. When the input voltage is too low, since the system cannot obtain enough energy, its operating voltage is lower than the minimum voltage required for normal operation, which will cause the system to fail to work properly, seriously affecting the overall performance and reliability of the system. Moreover, if it is under too high or too low voltage for a long time, it will accelerate its aging and may even cause it to be damaged instantly, thus affecting the performance and service life of the entire system. Summary of the invention

[0004] The embodiments of the present invention provide a pass-through voltage detection circuit and an energy storage system, aiming to solve the technical problem in the prior art that the output voltage of the energy storage system is easily too high or too low, thereby reducing the reliability of the energy storage system.

[0005] In order to solve the above technical problems, a technical solution adopted in the embodiment of the present invention is: to provide a band-pass voltage detection circuit, the band-pass voltage detection circuit comprising

[0006] A first voltage divider module, a first voltage stabilizer, a second voltage divider module, a second voltage stabilizer, and a switch module;

[0007] The first voltage divider module is connected to the reference input terminal of the first voltage regulator, the cathode of the first voltage regulator is respectively connected to the reference input terminal of the second voltage regulator and the second voltage divider module, the first voltage divider module and the second voltage divider module are also used to connect to the power supply, the switch module is connected to the second voltage regulator, and the switch module is also used to connect to the power supply and the reference power supply respectively;

[0008] The first voltage divider module is used to divide the power supply, and provide a first voltage divider signal to the first voltage regulator to control the conduction or cutoff of the first voltage regulator; when the first voltage regulator is turned on, it controls the cutoff of the second voltage regulator, and when the first voltage regulator is cut off, the second voltage divider module provides a second voltage divider signal to the second voltage regulator to control the cutoff or conduction of the second voltage regulator; the second voltage regulator is used to control the conduction of the switch module, and cooperate with the reference power supply to control the switch module to output high and low signals to determine whether the power supply is within the passband range.

[0009] Optionally, the switch module is further configured to, when the second regulator is turned on, output a low level signal based on the second regulator being turned on and according to the reference power supply, so as to determine that the power supply is within a passband range; and

[0010] When the second regulator is turned off, based on the second regulator being turned off and based on the reference power supply outputting a high level signal, it is determined that the power supply is not within the passband range.

[0011] Optionally, the first voltage dividing module includes a resistor R1 and a resistor R4;

[0012] The resistor R4 is connected to the power supply, the resistor R4 is connected in series with the resistor R1, the resistor R4 is also connected to the reference input terminal of the first voltage regulator U1, and the resistor R1 is also used for grounding;

[0013] The resistance value of the resistor R1, the resistance value of the resistor R4, and the reference voltage of the first voltage regulator U1 jointly set the maximum voltage end value of the passband range of the power supply.

[0014] Optionally, the resistor R6 is connected in series with the resistor R7, the resistor R6 is also connected to the power supply and the second regulator U2 respectively, and the resistor R7 is also used for grounding;

[0015] The resistance value of the resistor R6, the resistance value of the resistor R7 and the reference voltage of the second voltage regulator U2 jointly determine the minimum voltage end value of the passband range of the power supply.

[0016] Optionally, the ratio of the resistance value of the resistor R4 to the resistance value of the resistor R1 is greater than the ratio of the resistance value of the resistor R6 to the resistance R7;

[0017] The maximum voltage V H The calculation formula is:

[0018] V H =(1+R4 / R1)*V ref1 ;

[0019] The minimum voltage value UL The calculation formula is:

[0020] U L =(1+R6 / R7)*V ref2 Among them, V ref1＝ V ref2 ;

[0021] Where R1 is the resistance value of resistor R1, R4 is the resistance value of resistor R4, V ref1 is the reference voltage of the first voltage regulator U1, R6 is the resistance value of the resistor R6, R7 is the resistance value of the resistor R7, V ref2 is the reference voltage of the second regulator U2.

[0022] Optionally, the resistance value of the resistor R4 is the same as the resistance value of the resistor R6, and the resistance value of the resistor R1 is the same as the resistance value of the resistor R7;

[0023] The maximum voltage V H The calculation formula is:

[0024] V H =(1+R4 / R1)*V ref1 ;

[0025] The minimum voltage value U L The calculation formula is:

[0026] U L =(1+R6 / R7)*V ref2 , where V ref1＞ V ref2 ;

[0027] Where R1 is the resistance value of resistor R1, R4 is the resistance value of resistor R4, V ref1 is the reference voltage of the first voltage regulator U1, R6 is the resistance value of the resistor R6, R7 is the resistance value of the resistor R7, V ref2 is the reference voltage of the second regulator U2.

[0028] Optionally, the switch module includes a switch unit and a control unit;

[0029] The switch unit is connected to the control unit and the second voltage stabilizer respectively, the switch unit is also used to connect the power supply, and the control unit is also used to connect the reference power supply;

[0030] The switch unit is used for receiving a first control signal output by the second regulator when the second regulator is turned on, and controlling the control unit to operate according to the first control signal so that the control unit outputs a low level signal; and

[0031] When the second regulator is turned off, a second control signal output by the second regulator is received, and the control unit is controlled to stop working according to the second control signal, so that the control unit outputs a high level signal based on the reference power supply.

[0032] Optionally, the switch unit includes a switch tube Q2, a resistor R2 and a resistor R5;

[0033] The first end of the switch tube Q2 is connected to the power supply, and the first end of the switch tube Q2 is also connected to the control end of the switch tube Q2 through the resistor R2, the control end of the switch tube Q2 is connected to the second regulator through the resistor R5, and the second end of the switch tube Q1 is connected to the control unit.

[0034] Optionally, the control unit includes a switch tube Q1, a resistor R3 and a resistor R8;

[0035] The control end of the switch tube Q1 is connected to the switch unit through the resistor R8, the first end of the switch tube Q1 is connected to the reference power supply through the resistor R3, the first end of the switch tube Q1 is also connected to the controller, and the second end of the switch tube Q1 is also used for grounding.

[0036] In order to solve the above technical problems, another technical solution adopted in the embodiment of the present invention is: to provide an energy storage system, the energy storage system comprising:

[0037] Power supply;

[0038] Reference power supply;

[0039] Controller; and

[0040] A passband voltage detection circuit as described above.

[0041] Different from the related art, the present invention provides a bandpass voltage detection circuit and energy storage system, the bandpass voltage detection circuit includes a first voltage divider module, a first voltage regulator, a second voltage divider module, a second voltage regulator, and a switch module; the first voltage divider module is connected to the reference input end of the first voltage regulator, the cathode of the first voltage regulator is respectively connected to the reference input end of the second voltage regulator and the second voltage divider module, the first voltage divider module and the second voltage divider module are also used to connect the power supply, the switch module is connected to the second voltage regulator, and the switch module is also used to connect the power supply and the reference power supply respectively. The first voltage divider module is used to divide the power supply, and provide a first voltage divider signal to the first voltage regulator to control the conduction or cutoff of the first voltage regulator; when the first voltage regulator is turned on, the second voltage divider module controls the cutoff of the second voltage regulator, and when the first voltage regulator is cut off, the second voltage divider module provides a second voltage divider signal to the second voltage regulator to control the cutoff or conduction of the second voltage regulator; the second voltage regulator is used to control the conduction of the switch module, and cooperate with the reference power supply to control the switch module to output high and low signals to determine whether the power supply is within the bandpass range. Based on this, the high and low signals output by the switch module can be used to determine whether the power supply is within the passband range, thereby avoiding the situation where the output voltage of the power supply is too high, causing damage to the electrical equipment, or the output voltage is too low, causing the electrical equipment to fail to work normally, thereby improving the reliability of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0043] Figure 1 is a schematic diagram of an application scenario provided by an embodiment of the present invention;

[0044] Figure 2 is a structural block diagram of a pass-through voltage detection circuit provided by an embodiment of the present invention;

[0045] Figure 3 It is a circuit diagram of a pass-through voltage detection circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] It should be noted that, if there is no conflict, the various features in the embodiments of the present invention can be combined with each other, and all are within the protection scope of the present invention. In addition, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in a different order from the module division in the device schematic diagram or the order in the flow chart.

[0048] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0049] See also Figure 1 , Figure 1 is a schematic diagram of an application scenario provided by an embodiment of the present invention, such as Figure 1 As shown, the application scenario 1 includes an energy storage system 100 and a load 200, and the energy storage system 100 is connected to the load 200. The energy storage system 100 is used to provide a power supply voltage to the load 200, so that the load 200 works normally based on the power supply voltage.

[0050] Among them, Figure 1 As shown, the energy storage system 100 also includes a power supply 10, which is used to store voltage, and when the energy storage system 100 is connected to the load 200, the stored voltage is output to the load 200 to supply power to the load 200. It should be noted that when the energy storage system 100 supplies power to the load 200, if the voltage stored in the energy storage system 100 is too high, that is, when the voltage stored in the power supply 10 is too high, the load 200 will fail, and if the voltage stored in the energy storage system 100 is too low, the load 200 will not work properly. Therefore, the passband voltage detection circuit 30 is set at the output end of the power supply 10, and the output voltage of the power supply 10 is detected in real time by the passband voltage detection circuit 30 to determine whether the voltage stored in the power supply 10 is within the passband range.

[0051] Further, such as Figure 1As shown, the energy storage system 100 also includes a controller 20 and a reference power supply 40, and the reference power supply 40 and the controller 20 are also connected to the passband voltage detection circuit 30. When the output voltage of the power supply 10 is within the passband range, the passband voltage detection circuit 30 will output a low-level signal to the controller 20, so that the controller 20 controls the power supply 10 to output the voltage to the load 200 according to the low-level signal, thereby supplying power to the load 200. If the output voltage of the power supply 10 is not within the passband range, the passband voltage detection circuit 30 will output a high-level signal to the controller 20 based on the reference power supply 40, so that the controller 20 stops outputting the output voltage of the power supply 10 based on the high-level signal, thereby stopping the load 200 from working.

[0052] For further information, see Figure 2 , Figure 2 is a structural block diagram of a passband voltage detection circuit provided by an embodiment of the present invention, such as Figure 2 As shown, the passband voltage detection circuit 30 includes a first voltage divider module 31, a second voltage divider module 32, a first voltage regulator U1, a second voltage regulator U2 and a switch module 33. The first voltage divider module 31 is connected to the reference input terminal of the first voltage regulator U1, the first voltage regulator U1 is also connected to the reference input terminals of the second voltage divider module 32 and the second voltage regulator U2 respectively, the first voltage divider module 31 and the second voltage divider module 32 are also used to connect to the power supply 10, the second voltage regulator U2 is also connected to the switch module 33, and the switch module 33 is also used to connect to the power supply 10 and the reference power supply 40 respectively.

[0053] The first voltage divider module 31 is used to divide the voltage of the power supply 10, and provide a first voltage divider signal to the first voltage regulator U1 to control the on or off of the first voltage regulator U1. When the first voltage regulator U1 is on, the second voltage regulator U2 is controlled to be off; when the first voltage regulator U1 is off, the second voltage divider module 32 provides a voltage divider signal to the second voltage regulator U2 to control the on or off of the second voltage regulator U2. The second voltage regulator U2 is used to control the on-state of the switch module 33, and cooperates with the reference power supply 40 to control the switch module 33 to output a high or low signal to determine whether the power supply 10 is within the passband range.

[0054] It can be known that when the energy storage system 100 supplies power to the load 200 , it is necessary to detect the output voltage of the energy storage system 100 to determine whether the output voltage of the power supply 10 is within the passband range.

[0055] Specifically, when the power supply 10 outputs a voltage, the first voltage divider module 31 divides the output voltage of the power supply 10 and provides a first voltage divider signal to the reference input terminal of the first voltage regulator U1. It should be noted that the working state of the first voltage regulator U1 or the second voltage regulator U2 is determined based on the voltage input to the reference input terminal. When the voltage input to the reference input terminal of the first voltage regulator U1 is greater than the reference voltage of the first voltage regulator U1, the first voltage regulator U1 starts to work, or when the voltage input to the reference input terminal of the second voltage regulator U2 is greater than the reference voltage of the second voltage regulator U2, the second voltage regulator U2 starts to work.

[0056] Therefore, when the first voltage-dividing signal is greater than the reference voltage of the reference input terminal of the first voltage regulator U1, the first voltage regulator U1 is turned on. When the first voltage regulator U1 is turned on, the second voltage regulator U2 is controlled to be turned off. When the first voltage-dividing signal is less than the reference voltage of the first voltage regulator U1, the second voltage-dividing module 32 divides the power supply 10 and inputs the divided second voltage-dividing signal to the reference input terminal of the second voltage regulator U2. At this time, if the second voltage-dividing signal is greater than the reference voltage of the second voltage regulator U2, the second voltage regulator U2 is turned on, and if the second voltage-dividing signal is less than the reference voltage of the second voltage regulator U2, the second voltage regulator U2 is turned off.

[0057] Further, the switch module 33 is also used for, when the second regulator U2 is turned on, outputting a low level signal based on the second regulator U2 being turned on and according to the reference power supply 40 to determine that the power supply 10 is within the passband range; and

[0058] When the second regulator U2 is turned off, based on the second regulator U2 being turned off and based on the reference power supply 40 outputting a high level signal, it is determined that the power supply 10 is not within the passband range.

[0059] Specifically, when the second voltage regulator U2 is turned on, the switch module 33 is also in the on state, thereby outputting a low-level signal to the controller 20 according to the reference power supply 40 to prompt that the output voltage of the power supply 10 is within the passband range. If the second voltage regulator U2 is turned off, the switch module 33 is also turned off. At this time, the switch module 33 will output a high-level signal to the controller 20 based on the reference power supply 40 to prompt that the power supply 10 is not within the passband range.

[0060] In some embodiments, see Figure 3 , Figure 3 is a circuit diagram of a pass-through voltage detection circuit provided by an embodiment of the present invention, such as Figure 3As shown, the first voltage dividing module 31 includes a resistor R4 and a resistor R1; the second voltage dividing module 32 includes a resistor R6 and a resistor R7.

[0061] The resistor R4 is connected to the power supply 10 , and is connected in series with the resistor R1 . The resistor R4 is also connected to the reference input terminal of the first voltage regulator U1 , and the resistor R1 is also used for grounding.

[0062] The resistor R6 is connected in series with the resistor R7. The resistor R6 is also connected to the power supply 10 and the second voltage stabilizer U2 respectively. The resistor R7 is also used for grounding.

[0063] In another embodiment, the resistance value of the resistor R1, the resistance value of the resistor R4, and the reference voltage of the first voltage regulator U1 jointly set the maximum end value of the passband voltage range of the power supply 10, and the resistance value of the resistor R6, the resistance value of the resistor R7, and the reference voltage of the second voltage regulator U2 jointly determine the minimum end value of the passband voltage range of the power supply 10.

[0064] Among them, the maximum voltage value V H The calculation formula is:

[0065] V H =(1+R4 / R1)*V ref1 ;

[0066] The minimum voltage value U L The calculation formula is:

[0067] U L =(1+R6 / R7)*V ref2 ;

[0068] Where R1 is the resistance value of resistor R1, R4 is the resistance value of resistor R4, V ref1 is the reference voltage of the first voltage regulator U1, R6 is the resistance value of the resistor R6, R7 is the resistance value of the resistor R7, V ref2 is the reference voltage of the second regulator U2.

[0069] In some embodiments, when setting the maximum voltage end value and the minimum voltage end value of the passband range, it can be achieved by setting different resistance values. Specifically, the reference voltage of the first voltage regulator U1 and the reference voltage of the second voltage regulator U2 are set to the same voltage value, and the resistance ratio of the resistor R4 to the resistor R1 is greater than the resistance ratio of the resistor R6 to the resistor R7, so as to obtain the maximum voltage end value and the minimum voltage end value of the passband range, and the passband range is [U L， V H ].

[0070] Specifically, refer to Figure 3 , the resistors R1 and R4 of the first voltage divider module 31 divide the voltage and provide a first voltage divider signal for the reference input terminal of the first voltage regulator U1. L， V H ], the first voltage-divided signal is less than the reference voltage V of the first voltage regulator tube U1. ref1 , so that the first voltage regulator U1 is not turned on, and the second voltage regulator U2 obtains a second voltage-divided signal through the resistors R7 and R6 of the second voltage-dividing module 32, and the second voltage-divided signal is greater than the reference voltage V of the second voltage regulator U2. ref2 , so that the second voltage regulator U2 is turned on and works, and then the switch module 33 outputs a high level signal.

[0071] When the input voltage of the power supply 10 is greater than the maximum voltage V H When the first voltage-divided signal is greater than the reference voltage V of the first voltage regulator U1 ref1 , so that the first voltage regulator U1 is turned on, and when the first voltage regulator U1 is turned on, the reference input voltage of the second voltage regulator U2 is pulled down, so that the second voltage regulator U2 is not turned on, that is, the second voltage regulator U2 does not work, and then the switch module 33 outputs a low-level signal. L When the first voltage-divided signal is less than the reference voltage V of the first voltage regulator U1 ref1 , so that the first voltage regulator U1 is not turned on, at this time, the second voltage regulator U2 obtains a second voltage-divided signal through the voltage-divided resistor R7 of the second voltage-divided module, and the second voltage-divided signal is less than the reference voltage V of the second voltage regulator U2 ref2 , so that the second voltage regulator U2 is not turned on, that is, the second voltage regulator U2 does not work, and the switch module 33 outputs a low level signal. Based on this, it can be determined whether the output voltage of the power supply 10 is within the passband range through the high and low signals output by the switch module 33, thereby extending the life of the energy storage system 100 and improving the reliability of the energy storage system 100.

[0072] In another embodiment, when setting the maximum voltage end value and the minimum voltage end value of the passband range, it can also be achieved by setting different reference voltages. Specifically, the resistance value of the resistor R4 and the resistance value of the resistor R6 are set to the same resistance value, the resistance value of the resistor R1 and the resistance value of the resistor R7 are set to the same resistance value, and the reference voltage of the first voltage regulator U1 is set to be greater than the reference voltage of the second voltage regulator U2, so as to obtain the maximum voltage end value and the minimum voltage end value of the passband range.

[0073] In yet another embodiment, Figure 2As shown, the switch module 33 includes a switch unit 331 and a control unit 332; the switch unit 331 is connected to the control unit 332 and the second regulator U2 respectively, the switch unit 331 is also used to connect the power supply 10, and the control unit 332 is also used to connect the reference power supply 40.

[0074] The switch unit 331 is used to receive the first control signal output by the second voltage regulator U2 when the second voltage regulator U2 is working, and control the control unit 332 to work according to the first control signal, so that the control unit 332 outputs a low level signal; and

[0075] When the second regulator U2 stops working, the second control signal output by the second regulator U2 is received, and the control unit 332 is controlled to stop working according to the second control signal, so that the control unit 332 outputs a high level signal based on the reference power supply 40 .

[0076] Specifically, when the output voltage of the power supply 10 is within the passband range, the second regulator U2 is in the on state, thereby outputting a first control signal to the switch unit 331. After the switch unit 331 receives the first control signal, it starts working based on the first control signal and controls the control unit 332 to start working. When the control unit 332 starts working, it outputs a low-level signal to the controller 20 to prompt that the output voltage of the power supply 10 is within the passband range.

[0077] When the output voltage of the power supply 10 is not within the passband range, the second regulator U2 will be in a cut-off state, thereby outputting a second control signal to the switch unit 331. When the switch unit 331 receives the second control signal, it will stop working and control the control unit 332 to stop working as well, so that the control unit 332 outputs a high-level signal to the controller 20 based on the reference power supply 40 to prompt that the output voltage of the power supply 10 is not within the passband range.

[0078] In yet another embodiment, Figure 3 As shown, the switch unit 331 includes a switch tube Q2, a resistor R2 and a resistor R5; the control unit 332 includes a switch tube Q1, a resistor R3 and a resistor R8.

[0079] The first end of the switch tube Q2 is connected to the power supply 10, and the first end of the switch tube Q2 is also connected to the control end of the switch tube Q2 through the resistor R2. The control end of the switch tube Q2 is connected to the second regulator U2 through the resistor R5. The second end of the switch tube Q1 is connected to the control unit 332.

[0080] The control end of the switch tube Q1 is connected to the switch unit 331 through the resistor R8, the first end of the switch tube Q1 is connected to the reference power supply 40 through the resistor R3, the first end of the switch tube Q1 is also connected to the controller 20, and the second end of the switch tube Q1 is also used for grounding.

[0081] Specifically, when the second voltage regulator U2 starts working, the switch tube Q2 will also be turned on, so that the output voltage of the power supply 10 (SPS-power) is input to the control end of the switch tube Q1 through the switch tube Q2 and the resistor R8 to control the switch tube Q1 to be turned on. When the switch tube Q1 is turned on, SPS-EN is pulled down, so that the SPS-EN is a low-level signal, that is, the controller 20 receives the low-level signal, and then determines that the output voltage of the power supply 10 is within the passband range. If the second voltage regulator U2 stops working, the switch tube Q2 is turned off, so that the switch tube Q1 is also turned off. When the switch tube Q1 is turned off, the voltage of SPS-EN is pulled up by the reference power supply 40 (VCC), so that the SPS-EN is a high-level signal, that is, the controller 20 receives the high-level signal, and then determines that the voltage of the power supply 10 is not within the passband range; wherein, the high-level signal is the voltage value of the reference power supply VCC, and the low-level signal is 0V. Based on this, whether the voltage of the power supply 10 is within the passband range can be determined by a high level or a low level, thereby improving the reliability of the energy storage system.

[0082] In some embodiments, Figure 3 As shown, when the controller 20 receives the low level signal, the controller 20 will control the power supply 10 to output voltage to the load. At this time, the output voltage of the power supply 10 will be output to the load 200 through the PW-SPS port to power the load 200.

[0083] In another embodiment, if Figure 3 As shown, the switch module 33 further includes an anti-backflow diode D2, the anode of the diode D2 is connected to the switch tube Q2, and the cathode is connected to the resistor R8. The diode D2 is used to prevent the current of the load 200 from backflowing into the power supply 10 through the switch tube Q2 when the switch tube Q2 is turned on.

[0084] The present invention provides a bandpass voltage detection circuit, the bandpass voltage detection circuit includes a first voltage divider module, a first voltage stabilizer, a second voltage divider module, a second voltage stabilizer, and a switch module; the first voltage divider module is connected to the reference input end of the first voltage stabilizer, the cathode of the first voltage stabilizer is respectively connected to the reference input end of the second voltage stabilizer and the second voltage divider module, the first voltage divider module and the second voltage divider module are also used to connect the power supply, the switch module is connected to the second voltage stabilizer, and the switch module is also used to connect the power supply and the reference power supply respectively. The first voltage divider module is used to divide the power supply, and provide a first voltage divider signal to the first voltage stabilizer to control the conduction or cutoff of the first voltage stabilizer; when the first voltage stabilizer is turned on, the second voltage divider module controls the cutoff of the second voltage stabilizer, and when the first voltage stabilizer is cut off, the second voltage divider module provides a second voltage divider signal to the second voltage stabilizer to control the cutoff or conduction of the second voltage stabilizer; the second voltage stabilizer is used to control the conduction of the switch module, and cooperates with the reference power supply to control the switch module to output high and low signals to determine whether the power supply is within the bandpass range. Based on this, the high and low signals output by the switch module can be used to determine whether the power supply is within the passband range, thereby avoiding the situation where the output voltage of the power supply is too high, causing damage to the electrical equipment, or the output voltage is too low, causing the electrical equipment to fail to work normally, thereby improving the reliability of the energy storage system.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A passband voltage detection circuit, characterized in that: The passband voltage detection circuit includes a first voltage dividing module, a first voltage stabilizer, a second voltage dividing module, a second voltage stabilizer, and a switch module; The first voltage divider module is connected to the reference input terminal of the first voltage regulator, the cathode of the first voltage regulator is respectively connected to the reference input terminal of the second voltage regulator and the second voltage divider module, the first voltage divider module and the second voltage divider module are also used to connect to the power supply, the switch module is connected to the second voltage regulator, and the switch module is also used to connect to the power supply and the reference power supply respectively; The first voltage divider module is used to divide the power supply, and provide a first voltage divider signal to the first voltage regulator to control the conduction or cutoff of the first voltage regulator; when the first voltage regulator is turned on, it controls the cutoff of the second voltage regulator, and when the first voltage regulator is cut off, the second voltage divider module provides a second voltage divider signal to the second voltage regulator to control the cutoff or conduction of the second voltage regulator; the second voltage regulator is used to control the conduction of the switch module, and cooperate with the reference power supply to control the switch module to output high and low signals to determine whether the power supply is within the passband range.

2. The passband voltage detection circuit according to claim 1, characterized in that: The switch module is further used for, when the second regulator is turned on, outputting a low level signal based on the second regulator being turned on and according to the reference power supply, so as to determine that the power supply is within a passband range; as well as When the second regulator is turned off, based on the second regulator being turned off and based on the reference power supply outputting a high level signal, it is determined that the power supply is not within the passband range.

3. The passband voltage detection circuit according to claim 2, characterized in that: The first voltage dividing module includes a resistor R1 and a resistor R4; The resistor R4 is connected to the power supply, the resistor R4 is connected in series with the resistor R1, the resistor R4 is also connected to the reference input terminal of the first voltage regulator U1, and the resistor R1 is also used for grounding; The resistance value of the resistor R1, the resistance value of the resistor R4, and the reference voltage of the first voltage regulator U1 jointly set the maximum voltage end value of the passband range of the power supply.

4. The passband voltage detection circuit according to claim 3, characterized in that: The resistor R6 is connected in series with the resistor R7, and the resistor R6 is also connected to the power supply and the second voltage stabilizer U2 respectively, and the resistor R7 is also used for grounding; The resistance value of the resistor R6, the resistance value of the resistor R7 and the reference voltage of the second voltage regulator U2 jointly determine the minimum voltage end value of the passband range of the power supply.

5. The passband voltage detection circuit according to claim 4, characterized in that: The ratio of the resistance value of the resistor R4 to the resistance value of the resistor R1 is greater than the ratio of the resistance value of the resistor R6 to the resistance R7; The maximum voltage V H The calculation formula is: V H =(1+R4 / R1)*V ref1 ; The minimum voltage value U L The calculation formula is: U L =(1+R6 / R7)*V ref2 , where V ref1＝ V ref2 ; Where R1 is the resistance value of resistor R1, R4 is the resistance value of resistor R4, V ref1 is the reference voltage of the first voltage regulator U1, R6 is the resistance value of the resistor R6, R7 is the resistance value of the resistor R7, V ref2 is the reference voltage of the second regulator U2.

6. The passband voltage detection circuit according to claim 4, characterized in that: The resistance value of the resistor R4 is the same as the resistance value of the resistor R6, and the resistance value of the resistor R1 is the same as the resistance value of the resistor R7; The maximum voltage V H The calculation formula is: V H =(1+R4 / R1)*V ref1 ; The minimum voltage value U L The calculation formula is: U L =(1+R6 / R7)*V ref2 , where V ref1＞ V ref2 ; Where R1 is the resistance value of resistor R1, R4 is the resistance value of resistor R4, V ref1 is the reference voltage of the first voltage regulator U1, R6 is the resistance value of the resistor R6, R7 is the resistance value of the resistor R7, V ref2 is the reference voltage of the second regulator U2.

7. The passband voltage detection circuit according to any one of claims 1 to 6, characterized in that: The switch module includes a switch unit and a control unit; The switch unit is connected to the control unit and the second voltage stabilizer respectively, the switch unit is also used to connect the power supply, and the control unit is also used to connect the reference power supply; The switch unit is used to receive a first control signal output by the second voltage regulator when the second voltage regulator is turned on, and control the control unit to work according to the first control signal so that the control unit outputs a low level signal; as well as When the second regulator is turned off, a second control signal output by the second regulator is received, and the control unit is controlled to stop working according to the second control signal, so that the control unit outputs a high level signal based on the reference power supply.

8. The passband voltage detection circuit according to claim 7, characterized in that: The switch unit includes a switch tube Q2, a resistor R2 and a resistor R5; The first end of the switch tube Q2 is connected to the power supply, and the first end of the switch tube Q2 is also connected to the control end of the switch tube Q2 through the resistor R2, the control end of the switch tube Q2 is connected to the second regulator through the resistor R5, and the second end of the switch tube Q1 is connected to the control unit.

9. The passband voltage detection circuit according to claim 7, characterized in that: The control unit includes a switch tube Q1, a resistor R3 and a resistor R8; The control end of the switch tube Q1 is connected to the switch unit through the resistor R8, the first end of the switch tube Q1 is connected to the reference power supply through the resistor R3, the first end of the switch tube Q1 is also connected to the controller, and the second end of the switch tube Q1 is also used for grounding.

10. An energy storage system, characterized in that: The energy storage system comprises: Power supply; Reference power supply; Controller; and A passband voltage detection circuit as described in any one of claims 1 to 9.

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