Inductive current detection circuit and energy storage power supply

Abstract

The present application relates to an inductance current detection circuit and an energy storage power supply. The current detection circuit includes an RC detection module, a shunt detection module, and a control module; the RC detection module is connected in parallel with the inductor in the inductor branch, the RC detection module includes a first resistor and a first capacitor connected in series, the shunt detection module is arranged between the inductor and the output end of the inductor branch, the shunt detection module includes a second resistor, and the control module is respectively connected to the RC detection module and the shunt detection module. Among them, the control module is configured to, in response to the ambient temperature where the inductor is located, when the ambient temperature is less than the temperature threshold, control the RC detection module to conduct, and determine the inductance current of the inductor based on the electrical parameters of the first capacitor, and when the ambient temperature is not less than the temperature threshold, control the shunt detection module to conduct, and determine the inductance current based on the electrical parameters of the second resistor. Using this current detection circuit can accurately detect the inductance current.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to an inductor current detection circuit and an energy storage power supply. Background Art

[0002] Energy storage products need to continuously monitor the inductor current of the internal inductor to perform overcurrent protection through the inductor current. Therefore, the detection of the inductor current is an important technical link.

[0003] In the related art, the inductor current is usually detected by a current sensor, a series sampling resistor, etc. However, the accuracy of the currently detected inductor current is not high.

[0004] Therefore, how to provide an inductor current detection circuit with better accuracy is a technical problem that needs to be solved urgently in this field. Summary of the invention

[0005] Based on this, it is necessary to provide an inductor current detection circuit and energy storage power supply with better accuracy to address the above technical problems.

[0006] In a first aspect, the present application provides an inductor current detection circuit, including an RC detection module, a shunt detection module and a control module; the RC detection module is connected in parallel with the inductor in the inductor branch, the RC detection module includes a first resistor and a first capacitor connected in series, the shunt detection module is arranged between the inductor and the output end of the inductor branch, the shunt detection module includes a second resistor, and the control module is connected to the RC detection module and the shunt detection module respectively;

[0007] The control module is used to respond to the ambient temperature of the inductor, control the RC detection module to be turned on when the ambient temperature is less than a temperature threshold, and determine the inductor current of the inductor based on the electrical parameters of the first capacitor, and control the shunt detection module to be turned on when the ambient temperature is not less than the temperature threshold, and determine the inductor current based on the electrical parameters of the second resistor.

[0008] In one embodiment, the control module includes a detection switching submodule, an output switching submodule and a control submodule; the control submodule is respectively connected to the detection switching submodule and the output switching submodule, the detection switching submodule is connected in parallel with the shunt detection module, and the output switching submodule is respectively connected to the RC detection module and the shunt detection module;

[0009] The control sub-module is used to control the detection switching sub-module to conduct and control the first path between the first capacitor and the output switching sub-module to conduct when the ambient temperature is less than the temperature threshold, so as to determine the inductor current based on the electrical parameters of the first capacitor, and to control the detection switching sub-module to disconnect and control the second path between the second resistor and the output switching sub-module to conduct when the ambient temperature is not less than the temperature threshold, so as to determine the inductor current based on the electrical parameters of the second resistor.

[0010] In one embodiment, the control sub-module includes a first control unit and a second control unit connected to each other, and the second control unit is respectively connected to the detection switching sub-module and the output switching sub-module;

[0011] The first control unit is used to be in a disconnected state when the ambient temperature is less than the temperature threshold to control the second control unit to disconnect, and to be in a conducting state when the ambient temperature is not less than the temperature threshold to control the second control unit to conduct;

[0012] The second control unit is used to control both the detection switching sub-module and the first path to conduct when in a disconnected state, and to control the detection switching sub-module to disconnect and the second path to conduct when in a conducting state.

[0013] In one embodiment, the first control unit includes a temperature detection element and a first switching element; the temperature detection element is respectively connected to the first auxiliary power supply and the first switching element, the first auxiliary power supply is also connected to the output switching sub-module, and the first switching element is also connected to the second control unit; wherein, the resistance value of the temperature detection element is negatively correlated with the ambient temperature;

[0014] The temperature detection element is used to control the first switching element to disconnect when the ambient temperature is less than the temperature threshold, and to control the first switching element to conduct through the first auxiliary power supply when the ambient temperature is not less than the temperature threshold.

[0015] In one embodiment, the temperature detection element includes a thermistor, and the first switching element includes a first diode. The negative electrode of the first diode is connected to the thermistor, and the positive electrode of the first diode is connected to the second control unit.

[0016] In one embodiment, the second control unit includes an output control sub-unit and a detection control sub-unit; the output control sub-unit is respectively connected to the first control unit and the detection control sub-unit, the output control sub-unit is also connected to the output switching sub-module, and the detection control sub-unit is also connected to the detection switching sub-module;

[0017] The first control unit is further configured to control both the output control subunit and the detection control subunit to be disconnected when the ambient temperature is less than the temperature threshold, and to control both the output control subunit and the detection control subunit to be turned on when the ambient temperature is not less than the temperature threshold, and the turn-on time of the detection control subunit is earlier than that of the output control subunit.

[0018] In one embodiment, the output control subunit includes a delay element and a first transistor. The first end of the delay element is connected to the base of the first transistor and the first control unit respectively. The collector of the first transistor is connected to the output switching sub-module, and the emitter of the first transistor and the second end of the delay element are both grounded.

[0019] In one embodiment, the detection control subunit includes a second transistor. The base of the second transistor is connected to the first control unit. The collector of the second transistor is connected to the detection switching sub-module, and the base and the emitter of the second transistor are both grounded.

[0020] In one embodiment, the detection switching sub-module includes a first relay. The first relay includes a first coil, a first contact and a second contact. The first coil is connected to the second auxiliary power supply and the detection control subunit respectively;

[0021] The detection control subunit is configured to control the first coil to be powered off when in the off state, so as to control the first contact and the second contact to be connected, making the detection switching sub-module conductive, and when in the on state, power on the first coil through the second auxiliary power supply, so as to control the first contact and the second contact to be disconnected, making the detection switching sub-module disconnected;

[0022] The output switching sub-module includes a second relay. The second relay includes a second coil, a third contact and a fourth contact. The second coil is connected to the first auxiliary power supply and the output control subunit respectively;

[0023] The output control subunit is configured to control the second coil to be powered off when in the off state, so as to control the third contact and the fourth contact to be connected to both ends of the first capacitor respectively, making the first path conductive, and when in the on state, power on the second coil through the first auxiliary power supply, so as to control the third contact and the fourth contact to be connected to both ends of the second resistor, making the second path conductive.

[0024] In a second aspect, the present application further provides an energy storage power supply, which includes an inductor and the inductor current detection circuit according to any one of the above.

[0025] The above inductor current detection circuit and energy storage power supply, the inductor current detection circuit includes an RC detection module, a shunt detection module and a control module. The RC detection module is connected in parallel with the inductor in the inductor branch. The RC detection module includes a first resistor and a first capacitor connected in series. The shunt detection module is arranged between the inductor and the output end of the inductor branch. The shunt detection module includes a second resistor. The control module is respectively connected to the RC detection module and the shunt detection module. Since the control module can respond to the ambient temperature where the inductor is located, when the ambient temperature is less than the temperature threshold, the control module turns on the RC detection module and determines the inductor current of the inductor based on the electrical parameters of the first capacitor. And when the ambient temperature is not less than the temperature threshold, the control module turns on the shunt detection module and determines the inductor current based on the electrical parameters of the second resistor. Therefore, the inductor current can be detected by the RC detection module at low temperatures, and the inductor current can be detected in time by the shunt detection module at high temperatures. This can not only reduce the situation where the RC detection module has detection errors due to temperature changes, but also reduce the loss generated by the second resistor in the shunt detection module to a certain extent, and the accuracy is relatively good. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments of the present application or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0027] Figure 1 Schematic diagram of an inductor current detection circuit in an embodiment;

[0028] Figure 2 Schematic diagram of a control module in an embodiment;

[0029] Figure 3 Schematic diagram of a control sub-module in an embodiment;

[0030] Figure 4 Schematic diagram of a first control unit in an embodiment;

[0031] Figure 5 Schematic diagram of another inductor current detection circuit in an embodiment;

[0032] Figure 6 Schematic diagram of a second control unit in an embodiment;

[0033] Figure 7 Schematic diagram of an energy storage power supply in an embodiment. Detailed Embodiments

[0034] In order to make the objectives, technical solutions, and advantages of the present application more clearly understood, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] Figure 1 The following is a schematic diagram of an inductor current detection circuit in an embodiment. As Figure 1 shown, the inductor current detection circuit 100 includes an RC detection module 101, a shunt detection module 102, and a control module 103.

[0036] Among them, the RC detection module 101 is connected in parallel with the inductor 200 in the inductor branch. The RC detection module 101 includes a first resistor 1011 and a first capacitor 1012 connected in series. The shunt detection module 102 is disposed between the inductor 200 and the output end of the inductor branch. The shunt detection module 102 includes a second resistor 1021. The control module 103 is respectively connected to the RC detection module 101 and the shunt detection module 102.

[0037] Further, the control module 103 is configured to, in response to the ambient temperature where the inductor 200 is located, control the RC detection module 101 to conduct when the ambient temperature is less than the temperature threshold, and determine the inductor current of the inductor 200 based on the electrical parameters of the first capacitor 1012, and control the shunt detection module 102 to conduct when the ambient temperature is not less than the temperature threshold, and determine the inductor current based on the electrical parameters of the second resistor 1021.

[0038] In this embodiment, the RC detection module 101 provides continuous non-destructive monitoring of the inductor current through an RC sensing network connected in parallel with the inductor 200, and it can determine the voltage drop of the inductor 200 in a differential manner. For example, when the time constant corresponding to the first resistor 1011 and the first capacitor 1012 is equal to the time constant corresponding to the inductor 200, the voltage on the first capacitor 1012 is equal to the voltage of the inductor 200. Among them, the time constant corresponding to the first resistor 1011 and the first capacitor 1012 is equal to the resistance value of the first resistor 1011 multiplied by the capacitance value of the first capacitor 1012; the time constant corresponding to the inductor 200 is equal to the inductance value of the inductor 200 divided by the DC internal resistance value of the inductor 200. However, the applicant has found through research that when the inductor 200 passes through current through the RC detection module 101, the value of the inductor 200 will change due to temperature changes. Therefore, there is a difference between the time constant corresponding to the first resistor 1011 and the first capacitor 1012 and the time constant corresponding to the inductor 200, resulting in detection errors.

[0039] The shunt detection module 102 samples in a Kelvin connection manner by placing a second resistor 1021 between the inductor 200 and the output end of the inductor branch. However, the applicant has found through research that although the method of using the shunt detection module 102 can generally provide relatively accurate detection and overcurrent protection throughout the operating temperature range, the shunt detection module 102 will introduce additional detection errors due to the loss generated by the current on the second resistor 1021.

[0040] Therefore, the control module 103 needs to respond to the ambient temperature where the inductor 200 is located and control one of the RC detection module 101 or the shunt detection module 102 to work in response to the ambient temperature where the inductor 200 is located. Among them, the ambient temperature can indicate the situation where the inductor 200 will cause the ambient temperature where it is located due to external environment or its own heat generation. Optionally, the control module 103 can obtain the ambient temperature where the inductor 200 is located through a temperature sensor. Among them, the temperature threshold can be set according to actual needs.

[0041] Optionally, the control module 103 can include at least one switching element. Among them, the switching element can include an Insulated Gate Bipolar Transistor (IGBT) and a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET).

[0042] Furthermore, if the ambient temperature is less than the temperature threshold, the path between the control module 103 and the RC detection module 101 can be turned on through the switching element. In this way, when the RC detection module 101 is turned on, the inductor current of the inductor 200 can be determined based on the electrical parameters of the first capacitor 1012. If the ambient temperature is not less than the temperature threshold, that is, when the ambient temperature is greater than or equal to the temperature threshold, the path between the control module 103 and the shunt detection module 102 is turned on through the switching element. In this way, when the shunt detection module 102 is turned on, the inductor current of the inductor 200 can be determined based on the electrical parameters of the second resistor 1021. Among them, the electrical parameters include but are not limited to current or voltage.

[0043] In some embodiments, the control module 103 can also include but is not limited to a Central Processing Unit (CPU), a Digital Signal Processing (DSP), a Field-Programmable Gate Array (FPGA), or other programmable logic devices to perform the above control through software logic.

[0044] In the above-mentioned inductance current detection circuit 100, the inductance current detection circuit 100 includes an RC detection module 101, a shunt detection module 102, and a control module 103. The RC detection module 101 is connected in parallel with the inductor 200 in the inductor branch. The RC detection module 101 includes a first resistor 1011 and a first capacitor 1012 connected in series. The shunt detection module 102 is arranged between the inductor 200 and the output end of the inductor branch. The shunt detection module 102 includes a second resistor 1021. The control module 103 is respectively connected to the RC detection module 101 and the shunt detection module 102. Since the control module 103 can respond to the ambient temperature where the inductor 200 is located, when the ambient temperature is less than the temperature threshold, the control module 103 turns on the RC detection module 101 and determines the inductance current of the inductor 200 based on the electrical parameters of the first capacitor 1012. And when the ambient temperature is not less than the temperature threshold, the control module 103 turns on the shunt detection module 102 and determines the inductance current based on the electrical parameters of the second resistor 1021. Therefore, the inductance current can be detected by the RC detection module 101 when the temperature is low, and the inductance current can be detected by the shunt detection module 102 in a timely manner when the temperature is high. This can not only reduce the situation where the RC detection module 101 has detection errors due to temperature changes, but also reduce the losses generated by the second resistor 1021 in the shunt detection module 102 to a certain extent, and the accuracy is relatively good.

[0045] Figure 2 It is a schematic diagram of a control module in an embodiment, as Figure 2 shown. In an exemplary embodiment, optionally, the control module 103 includes a detection switching sub-module 1031, an output switching sub-module 1032, and a control sub-module 1033.

[0046] Among them, the control sub-module 1033 is respectively connected to the detection switching sub-module 1031 and the output switching sub-module 1032. The detection switching sub-module 1031 is connected in parallel with the shunt detection module 102. The output switching sub-module 1032 is respectively connected to the RC detection module 101 and the shunt detection module 102.

[0047] Furthermore, the control sub-module 1033 is configured to control the detection switching sub-module 1031 to turn on when the ambient temperature is less than the temperature threshold. Since the detection switching sub-module 1031 is connected in parallel with the shunt detection module 102, the shunt detection module 102 is short-circuited. Therefore, the RC detection module 101 is put into the loop. Furthermore, the control sub-module 1033 will control the first path between the first capacitor 1012 and the output switching sub-module 1032 to turn on to determine the inductance current based on the electrical parameters of the first capacitor 1012, so as to detect the inductance current through the RC detection module 101.

[0048] Moreover, the control sub-module 1033 is further configured to control the detection switching sub-module 1031 to disconnect when the ambient temperature is not less than the temperature threshold, so that the shunt detection module 102 is put into the loop. Furthermore, the control sub-module 1033 will control the second path between the second resistor 1021 and the output switching sub-module 1032 to conduct, so as to determine the inductor current based on the electrical parameters of the second resistor 1021, and realize the detection of the inductor current through the shunt detection module 102.

[0049] Optionally, the detection switching sub-module 1031, the output switching sub-module 1032, and the control sub-module 1033 may each include at least one switching element to implement the above process through the corresponding switching element.

[0050] It can be understood that the detection switching sub-module 1031 is used to switch the detection method of the inductor current. The output switching sub-module 1032 is used to switch the output path of the inductor current to obtain the corresponding inductor current.

[0051] In the above embodiment, the control module 103 includes a detection switching sub-module 1031, an output switching sub-module 1032, and a control sub-module 1033. Moreover, the control sub-module 1033 is respectively connected to the detection switching sub-module 1031 and the output switching sub-module 1032. The detection switching sub-module 1031 is connected in parallel with the shunt detection module 102. The output switching sub-module 1032 is respectively connected to the RC detection module 101 and the shunt detection module 102. Since the control sub-module 1033 can control the detection switching sub-module 1031 to conduct when the ambient temperature is less than the temperature threshold, and control the first path between the first capacitor 1012 and the output switching sub-module 1032 to conduct, so as to determine the inductor current based on the electrical parameters of the first capacitor 1012, and when the ambient temperature is not less than the temperature threshold, control the detection switching sub-module 1031 to disconnect, and control the second path between the second resistor 1021 and the output switching sub-module 1032 to conduct, so as to determine the inductor current based on the electrical parameters of the second resistor 1021. Therefore, the RC detection module 101 or the shunt detection module 102 can be timely switched to work according to the ambient temperature of the inductor 200, so as to accurately and efficiently determine the inductor current based on the electrical parameters of the first capacitor 1012 or the second resistor 1021.

[0052] Figure 3 Schematic diagram of a control sub-module in an embodiment, as Figure 3 shown, in an exemplary embodiment, optionally, the control sub-module 1033 includes a first control unit 1033a and a second control unit 1033b that are connected to each other. The second control unit 1033b is respectively connected to the detection switching sub-module 1031 and the output switching sub-module 1032.

[0053] Among them, the first control unit 1033a is used to be in a disconnected state when the ambient temperature is less than the temperature threshold to control the second control unit 1033b to be disconnected, and to be in a conducting state when the ambient temperature is not less than the temperature threshold to control the second control unit 1033b to be conducting.

[0054] Exemplarily, the first control unit 1033a may include a relay, and the second control unit 1033b may include a transistor; when the ambient temperature is less than the temperature threshold, the relay in the first control unit 1033a is disconnected to control the transistor in the second control unit 1033b to be disconnected, and when the ambient temperature is not less than the temperature threshold, the relay in the first control unit 1033a is closed to control the transistor in the second control unit 1033b to be closed.

[0055] Furthermore, the second control unit 1033b can control both the detection switching sub-module 1031 and the first path to be conducting when in a disconnected state to determine the inductor current based on the electrical parameters of the first capacitor 1012, and detect the inductor current through the RC detection module 101. And the second control unit 1033b can control the detection switching sub-module 1031 to be disconnected and the second path to be conducting when in a conducting state to determine the inductor current based on the electrical parameters of the second resistor 1021, and detect the inductor current through the shunt detection module 102.

[0056] In the above embodiments, the control sub-module 1033 includes a first control unit 1033a and a second control unit 1033b connected to each other, and the second control unit 1033b is respectively connected to the detection switching sub-module 1031 and the output switching sub-module 1032. Since the first control unit 1033a can be in a disconnected state when the ambient temperature is less than the temperature threshold to control the second control unit 1033b to be disconnected, and can be in a conducting state when the ambient temperature is not less than the temperature threshold to control the second control unit 1033b to be conducting, and the second control unit 1033b can control both the detection switching sub-module 1031 and the first path to be conducting when in a disconnected state, and can control the detection switching sub-module 1031 to be disconnected and the second path to be conducting when in a conducting state, therefore, through the control sub-module 1033, the corresponding detection method can be determined flexibly and accurately based on the ambient temperature.

[0057] Figure 4 Schematic diagram of a first control unit in an embodiment, as Figure 4 shown, in an exemplary embodiment, optionally, the first control unit 1033a includes a temperature detection element 402 and a first switching element 403.

[0058] Among them, the temperature detection element 402 is respectively connected to the first auxiliary power supply 401 and the first switching element 403. The first auxiliary power supply 401 is also connected to the output switching sub-module 1032, and the first switching element 403 is also connected to the second control unit 1033b. The first auxiliary power supply 401 can be any form of current source or voltage source, such as a DC power supply of 5 volts (V). The first switching element 403 includes but is not limited to a transistor, a diode, or a triode.

[0059] Moreover, the resistance value of the temperature detection element 402 is negatively correlated with the ambient temperature. That is to say, the higher the ambient temperature where the inductor 200 is located, the smaller the resistance value of the temperature detection element 402. Exemplarily, the temperature detection element 402 includes but is not limited to a thermistor, a carbon film resistor, or a semiconductor diode.

[0060] Furthermore, the state of the first switching element 403 can be controlled by the resistance value of the temperature detection element 402, such that the temperature detection element 402 controls the first switching element 403 to turn off when the ambient temperature is less than the temperature threshold, and controls the first switching element 403 to turn on through the first auxiliary power supply 401 when the ambient temperature is not less than the temperature threshold. That is to say, the temperature detection element 402 can disconnect the path between the first auxiliary power supply 401 and the first switching element 403 when its resistance value is greater than the resistance threshold to control the first switching element 403 to turn off; the temperature detection element 402 can conduct the path between the first auxiliary power supply 401 and the first switching element 403 when its resistance value is greater than the resistance threshold to control the first switching element 403 to turn on through the first auxiliary power supply 401.

[0061] In the above embodiment, the first control unit 1033a includes the temperature detection element 402 and the first switching element 403; the temperature detection element 402 is respectively connected to the first auxiliary power supply 401 and the first switching element 403. The first auxiliary power supply 401 is also connected to the output switching sub-module 1032, and the first switching element 403 is also connected to the second control unit 1033b. Since the resistance value of the temperature detection element 402 is negatively correlated with the ambient temperature, therefore, the ambient temperature can be determined timely and accurately through the resistance value of the temperature detection element 402, so that the temperature detection element 402 controls the first switching element 403 to turn off when the ambient temperature is less than the temperature threshold, and controls the first switching element 403 to turn on through the first auxiliary power supply 401 when the ambient temperature is not less than the temperature threshold, realizing the switching operation of the RC detection module 101 or the shunt detection module 102.

[0062] Figure 5 Schematic diagram of another inductor current detection circuit in an embodiment, as Figure 5As shown, in an exemplary embodiment, optionally, the temperature detection element 402 includes a thermistor RT, and the first switching element 403 includes a first diode DZ1. The negative electrode of the first diode DZ1 is connected to the thermistor RT, and the positive electrode of the first diode DZ1 is connected to the second control unit 1033b. Please continue to refer to Figure 5 , the first end of the thermistor RT is connected to the first auxiliary power supply 401, and the second end of the thermistor RT can be grounded. The first diode DZ1 includes but is not limited to a zener diode.

[0063] In the above embodiment, since the temperature detection element 402 includes a thermistor RT, the first switching element 403 includes a first diode DZ1, the negative electrode of the first diode DZ1 is connected to the thermistor RT, and the positive electrode of the first diode DZ1 is connected to the second control unit 1033b, therefore, the state of the first diode DZ1 can be controlled timely and accurately through the thermistor RT.

[0064] Figure 6 It is a schematic diagram of a second control unit in an embodiment. As Figure 6 shown, in an exemplary embodiment, optionally, the second control unit 1033b includes an output control subunit 501 and a detection control subunit 502.

[0065] Among them, the output control subunit 501 is respectively connected to the first control unit 1033a and the detection control subunit 502. The output control subunit 501 is also connected to the output switching sub-module 1032, and the detection control subunit 502 is also connected to the detection switching sub-module 1031.

[0066] Furthermore, the first control unit 1033a is further configured to control both the output control subunit 501 and the detection control subunit 502 to be disconnected when the ambient temperature is less than the temperature threshold, and to control both the output control subunit 501 and the detection control subunit 502 to be turned on when the ambient temperature is not less than the temperature threshold, and the conduction time of the detection control subunit 502 is earlier than the conduction time of the output control subunit 501.

[0067] It can be understood that when both the output control subunit 501 and the detection control subunit 502 are disconnected, it also means that the second control unit 1033b is in the disconnected state. In this case, the detection switching sub-module 1031 and the first path are both turned on to determine the inductor current based on the electrical parameters of the first capacitor 1012.

[0068] Similarly, when both the output control subunit 501 and the detection control subunit 502 are turned on, it also indicates that the second control unit 1033b is in the on state. In this case, the detection switching sub-module 1031 is disconnected and the second path is turned on to determine the inductor current based on the electrical parameters of the second resistor 1021.

[0069] Furthermore, by controlling the turn-on time of the detection control subunit 502 to be earlier than that of the output control subunit 501, after the detection switching sub-module 1031 connected to the detection control subunit 502 is disconnected first, the first path between the first capacitor 1012 and the output switching sub-module 1032 will continue to be turned on first. After a period of delay, the second path between the second resistor 1021 and the output switching sub-module 1032 is turned on. That is to say, the disconnection of the detection switching sub-module 1031 is earlier than the turn-on of the second path. In this way, by first switching to the shunt detection module 102 for detection when the detection switching sub-module 1031 is disconnected and then switching the output path of the inductor current to the second path, the relative continuity of the detected inductor current can be improved, and the sampling loss of the inductor current caused by the disconnection of the detection switching sub-module 1031 can be avoided.

[0070] In the above embodiment, the second control unit 1033b includes an output control subunit 501 and a detection control subunit 502; the output control subunit 501 is respectively connected to the first control unit 1033a and the detection control subunit 502, the output control subunit 501 is also connected to the output switching sub-module 1032, and the detection control subunit 502 is also connected to the detection switching sub-module 1031. Since the first control unit 1033a is further configured to control both the output control subunit 501 and the detection control subunit 502 to be turned off when the ambient temperature is less than the temperature threshold, and to control both the output control subunit 501 and the detection control subunit 502 to be turned on when the ambient temperature is not less than the temperature threshold, and the turn-on time of the detection control subunit 502 is earlier than that of the output control subunit 501, not only can the corresponding detection method be switched in a timely manner according to the ambient temperature, but also the relative continuity of the detected inductor current can be improved during the switching process, thereby improving the accuracy of the obtained inductor current.

[0071] In an exemplary embodiment, optionally, the output control subunit 501 includes a delay element and a first transistor Q1. The delay element may include, but is not limited to, a capacitor, a monostable flip-flop, or other elements with a delay function. Please continue to refer to Figure 5 , the delay element may include a capacitor C2.

[0072] Wherein, the first end of the delay element is respectively connected to the base of the first transistor Q1 and the first control unit 1033a, the collector of the first transistor Q1 is connected to the output switching sub-module 1032, and the emitter of the first transistor Q1 and the second end of the delay element are both grounded.

[0073] In the above embodiment, since the output control sub-unit 501 includes a delay element and a first transistor Q1, the first end of the delay element is respectively connected to the base of the first transistor Q1 and the first control unit 1033a, the collector of the first transistor Q1 is connected to the output switching sub-module 1032, and the emitter of the first transistor Q1 and the second end of the delay element are both grounded. Therefore, the delay element can be used to control the first transistor Q1 to turn on later than the detection control sub-unit 502.

[0074] Please continue to refer to Figure 5 , in an exemplary embodiment, optionally, the detection control sub-unit 502 includes a second transistor Q2. Wherein, the base of the second transistor Q2 is connected to the first control unit 1033a, the collector of the second transistor Q2 is connected to the detection switching sub-module 1031, and the base and the emitter of the second transistor Q2 are both grounded.

[0075] In the above embodiment, since the detection control sub-unit 502 includes a second transistor Q2, the base of the second transistor Q2 is connected to the first control unit 1033a, the collector of the second transistor Q2 is connected to the detection switching sub-module 1031, and the base and the emitter of the second transistor Q2 are both grounded. Therefore, the first control unit 1033a can timely control the state of the second transistor Q2.

[0076] In an exemplary embodiment, optionally, the detection switching sub-module 1031 includes a first relay RLY1. Wherein, the first relay RLY1 includes a first coil, a first contact and a second contact, and the first coil is respectively connected to the second auxiliary power supply VCC2 and the detection control sub-unit 502. Please continue to refer to Figure 5 , the first contact can be represented as contact 4 in the first relay RLY1, and the second contact can be represented as contact 3 in the first relay RLY1.

[0077] It should be noted that the second auxiliary power supply VCC2 can also be any form of current source or voltage source. The second auxiliary power supply VCC2 can be the same auxiliary power supply as the first auxiliary power supply 401, or a different auxiliary power supply, which is not limited in this embodiment.

[0078] When the detection control sub-unit 502 is in the off state, the path between the second auxiliary power supply VCC2 and the first coil is disconnected by the detection control sub-unit 502, and the second auxiliary power supply VCC2 cannot energize the first coil, thereby de-energizing the first coil. When the first coil is de-energized, the first contact and the second contact are connected, causing the detection switching sub-module 1031 to conduct, so as to switch to the RC detection module 101 to detect the inductor current.

[0079] When the detection control sub-unit 502 is in the on state, the path between the second auxiliary power supply VCC2 and the first coil is conducted by the detection control sub-unit 502, so as to energize the first coil through the second auxiliary power supply VCC2. When the first coil is energized, the first contact and the second contact are disconnected, causing the detection switching sub-module 1031 to disconnect, so as to switch to the shunt detection module 102 to detect the inductor current.

[0080] In the above embodiment, the detection switching sub-module 1031 includes a first relay RLY1. The first relay RLY1 includes a first coil, a first contact and a second contact. The first coil is respectively connected to the second auxiliary power supply VCC2 and the detection control sub-unit 502. Since the detection control sub-unit 502 can control the coil to be de-energized when in the off state to control the first contact and the second contact to be connected, so that the detection switching sub-module 1031 conducts, and when in the on state, energize the coil through the second auxiliary power supply VCC2 to control the first contact and the second contact to be disconnected, so that the detection switching sub-module 1031 disconnects. Therefore, the RC detection module 101 and the shunt detection module 102 can be switched to work flexibly and efficiently through the first relay RLY1.

[0081] In an exemplary embodiment, optionally, the output switching sub-module 1032 includes a second relay RLY2. Among them, the second relay RLY2 includes a second coil, a third contact and a fourth contact. The second coil is respectively connected to the first auxiliary power supply 401 (that is, Figure 5 VCC1 in) and the output control sub-unit 501. Please continue to refer to Figure 5 , the third contact can be represented as the 5th pin of the second relay RLY2, and the fourth contact can be represented as the 8th pin of the second relay RLY2.

[0082] When the output control sub-unit 501 is in the off state, the path between the first auxiliary power supply 401 and the second coil is disconnected by the output control sub-unit 501, and the first auxiliary power supply 401 cannot energize the second coil, thus de-energizing the second coil. When the second coil is de-energized, the third contact and the fourth contact are respectively connected to both ends of the first capacitor 1012, making the first path conductive to determine the inductance current based on the electrical parameters of the first capacitor 1012. That is to say, the electrical parameters of the first capacitor 1012 can be obtained through the first path, and the corresponding inductance current can be obtained according to the electrical parameters of the first capacitor 1012. For example, the voltage across the first capacitor 1012 can be obtained through the first path, and the corresponding inductance current can be calculated based on the voltage across the first capacitor 1012.

[0083] When the output control sub-unit 501 is in the on state, the path between the first auxiliary power supply 401 and the second coil is conducted by the output control sub-unit 501, so that the second coil is energized by the first auxiliary power supply 401. When the second coil is energized, the third contact and the fourth contact are respectively connected to both ends of the second resistor 1021, making the second path conductive to determine the inductance current based on the electrical parameters of the second resistor 1021. That is to say, the electrical parameters of the second resistor 1021 can be obtained through the second path, and the corresponding inductance current can be obtained according to the electrical parameters of the second resistor 1021. For example, the current flowing through the second resistor 1021 can be obtained through the second path, and the corresponding inductance current can be calculated based on the current of the second resistor 1021.

[0084] In the above embodiment, the output switching sub-module 1032 includes a second relay RLY2. The second relay RLY2 includes a second coil, a third contact and a fourth contact. The second coil is respectively connected to the first auxiliary power supply 401 and the output control sub-unit 501. Since the output control sub-unit 501 can control the second coil to be de-energized when in the off state to control the third contact and the fourth contact to be respectively connected to both ends of the first capacitor 1012, making the first path conductive, and when in the on state, energize the second coil through the first auxiliary power supply 401 to control the third contact and the fourth contact to be connected to both ends of the second resistor 1021, making the second path conductive. Therefore, the acquisition method of the inductance current can be flexibly and efficiently switched through the second relay RLY2.

[0085] Please continue to refer to Figure 5 , in one embodiment, optionally, the inductance current detection circuit 100 may further include at least one of the following:

[0086] (1) Amplifying element U1B. Among them, the amplifying element U1B is used to amplify the electrical parameters of the first capacitor 1012 or the electrical parameters of the second resistor 1021 to obtain an amplification result, so as to determine the corresponding inductor current based on the amplification result. The amplifying element U1B is connected to the output switching sub-module 1032. Optionally, the first input terminal of the amplifying element U1B is connected to the third contact, the second input terminal and the fourth contact of the amplifying element U1B are connected, and the output terminal of the amplifying element U1B is used to determine the inductor current. Exemplarily, the amplifying element U1B may include, but is not limited to, an operational amplifier.

[0087] (2) Resistor R1. The first end of the resistor R1 is respectively connected to the temperature detection element 402 and the negative electrode of the first switching element 403, and the second end of the resistor R1 is grounded.

[0088] (3) Resistor R2. The resistor R2 is respectively connected to the positive electrode of the first switching element 403 and the base of the first transistor Q1.

[0089] (4) Resistor R3. The first end of the resistor R3 is connected to the first end of the delay element, and the second end of the resistor R3 is connected to the second end of the delay element.

[0090] (5) Resistor R4. The first end of the resistor R4 is connected to the base of the second transistor Q2, and the second end of the resistor R4 is connected to the positive electrode of the first diode DZ1.

[0091] (6) Resistor R5. The first end of the resistor R5 is connected to the base of the second transistor Q2, and the second end of the resistor R5 is grounded.

[0092] (7) Capacitor C3. The first end of the capacitor C3 is connected to the base of the second transistor Q2, and the second end of the capacitor C3 is connected to the positive electrode of the first diode DZ1.

[0093] To more clearly introduce the inductor current detection circuit 100 of the present application, it is described herein in conjunction with Figure 5 for illustration. In Figure 5 , L1 represents the inductor 200, IN represents the input end of the inductor branch, and OUT represents the output end of the inductor branch. RL represents the DC internal resistance of the inductor 200, Rc represents the first resistor 1011, C1 represents the first capacitor 1012, and Rs represents the second resistor 1021. Among them, the second resistor 1021 may be a low-inductance tolerance shunt resistor.

[0094] When the ambient temperature where the inductor 200 is located is lower than the temperature threshold, the resistance value of the thermistor RT is greater than the resistance value threshold. At this time, the voltage obtained by dividing the voltage of VCC through the thermistor RT and the resistor R1 is less than a certain voltage preset value, and the first diode DZ1 is not broken down, and both the first transistor Q1 and the second transistor Q2 are in the off state.

[0095] Moreover, the pin 3 of the first relay RLY1 is a normally closed pin. That is, when the coil of the first relay RLY1 is not powered on, the pin 3 and pin 4 of the first relay RLY1 are connected. Therefore, when the ambient temperature where the inductor 200 is located is lower than the temperature threshold, the coil of the first relay RLY1 is not powered on and is in a closed state.

[0096] Similar to the principle of the first relay RLY1, when the ambient temperature where the inductor 200 is located is lower than the temperature threshold, the coil of the second relay RLY2 is not powered on, and the pin 5 and pin 8 of the second relay RLY2 are respectively connected to both ends of the first capacitor 1012 to obtain the electrical parameters of the first capacitor 1012.

[0097] Therefore, in such a case of relatively low temperature, the present application can use the RC detection module 101 to detect the inductor current, which can not only ensure the sampling accuracy but also reduce the loss generated by the current on the second resistor 1021.

[0098] When the ambient temperature where the inductor 200 is located is not lower than the temperature threshold, the voltage of the resistor R1 becomes larger after the thermistor RT and the resistor R1 divide the voltage, and the first diode DZ1 is reversely broken down to trigger the change of the sampling mode switch.

[0099] Since the capacitor C2 plays a role in delaying, the second transistor Q2 conducts before the first transistor Q1, that is, the second transistor Q2 conducts first and the first relay RLY1 disconnects first. At this time, the shunt detection module 102 is connected to the main circuit. After a preset delay time, the first transistor Q1 conducts, and the second relay RLY2 switches to the path corresponding to the shunt detection module 102 to complete the switching of the sampling mode.

[0100] It can be understood that when the first relay RLY1 disconnects, the second resistor 1021 samples the current signal, and the first capacitor 1012 also samples the current signal. By switching to the shunt current sensing, the sampling can be maintained relatively continuously, avoiding the loss of current sampling caused by the turn-off of the relay.

[0101] It can be seen that the inductor current detection circuit 100 provided by the present application can use the RC detection module 101 for sampling when the temperature is low and use the shunt detection module 102 for sampling when the temperature is high, which can not only ensure the detection accuracy but also avoid always using the shunt detection module 102, thereby reducing the loss generated by the current on the second resistor 1021, that is, the second resistor Rs, and thus reducing the power loss.

[0102] Figure 7 It is a schematic diagram of an energy storage power supply in an embodiment, as Figure 7As shown, in one embodiment, an energy storage power supply 700 is provided. The energy storage power supply 700 includes an inductor 200 and the inductor current detection circuit 100 of any one of the above.

[0103] Those of ordinary skill in the art can understand that all or part of the processes of implementing the methods in the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, artificial intelligence (AI) processors, etc., without limitation.

[0104] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope recorded in the present application.

[0105] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. An inductive current detection circuit, characterized in that, The inductance current detection circuit includes an RC detection module, a shunt detection module, and a control module; the RC detection module is connected in parallel with the inductor in the inductor branch, the RC detection module includes a first resistor and a first capacitor connected in series, the shunt detection module is disposed between the inductor and the output end of the inductor branch, the shunt detection module includes a second resistor, and the control module is respectively connected to the RC detection module and the shunt detection module; The control module is configured to, in response to the ambient temperature of the inductor, when the ambient temperature is less than the temperature threshold, control the RC detection module to conduct, and determine the inductance current of the inductor based on the electrical parameters of the first capacitor, and when the ambient temperature is not less than the temperature threshold, control the shunt detection module to conduct, and determine the inductance current based on the electrical parameters of the second resistor.

2. The inductive current detection circuit according to claim 1, wherein The control module includes a detection switching sub-module, an output switching sub-module, and a control sub-module; The control sub-module is respectively connected to the detection switching sub-module and the output switching sub-module, the detection switching sub-module is connected in parallel with the shunt detection module, and the output switching sub-module is respectively connected to the RC detection module and the shunt detection module; The control sub-module is configured to, when the ambient temperature is less than the temperature threshold, control the detection switching sub-module to conduct, and control the first path between the first capacitor and the output switching sub-module to conduct, so as to determine the inductance current based on the electrical parameters of the first capacitor, and when the ambient temperature is not less than the temperature threshold, control the detection switching sub-module to disconnect, and control the second path between the second resistor and the output switching sub-module to conduct, so as to determine the inductance current based on the electrical parameters of the second resistor.

3. The inductive current detection circuit according to claim 2, wherein The control sub-module includes a first control unit and a second control unit connected to each other, and the second control unit is respectively connected to the detection switching sub-module and the output switching sub-module; The first control unit is configured to be in a disconnected state when the ambient temperature is less than the temperature threshold, so as to control the second control unit to disconnect, and be in a conducting state when the ambient temperature is not less than the temperature threshold, so as to control the second control unit to conduct; The second control unit is configured to control the detection switching sub-module and the first path to conduct when in a disconnected state, and control the detection switching sub-module to disconnect and the second path to conduct when in a conducting state.

4. The inductive current detection circuit according to claim 3, characterized in that, The first control unit includes a temperature detection element and a first switching element; the temperature detection element is respectively connected to a first auxiliary power supply and the first switching element, the first auxiliary power supply is further connected to the output switching sub-module, and the first switching element is further connected to the second control unit; wherein, the resistance value of the temperature detection element is negatively correlated with the ambient temperature; The temperature detection element is used to control the first switching element to turn off when the ambient temperature is lower than the temperature threshold, and to control the first switching element to turn on through the first auxiliary power supply when the ambient temperature is not lower than the temperature threshold.

5. The inductance current detection circuit according to claim 4, characterized in that The temperature detection element includes a thermistor, and the first switching element includes a first diode. The negative electrode of the first diode is connected to the thermistor, and the positive electrode of the first diode is connected to the second control unit.

6. The inductive current detection circuit according to claim 3, wherein The second control unit includes an output control sub-unit and a detection control sub-unit; the output control sub-unit is respectively connected to the first control unit and the detection control sub-unit, the output control sub-unit is further connected to the output switching sub-module, and the detection control sub-unit is further connected to the detection switching sub-module; The first control unit is further configured to control both the output control sub-unit and the detection control sub-unit to turn off when the ambient temperature is lower than the temperature threshold, and to control both the output control sub-unit and the detection control sub-unit to turn on when the ambient temperature is not lower than the temperature threshold, and the conduction time of the detection control sub-unit is earlier than the conduction time of the output control sub-unit.

7. The inductive current detection circuit according to claim 6, characterized in that, The output control sub-unit includes a delay element and a first transistor. The first end of the delay element is respectively connected to the base of the first transistor and the first control unit. The collector of the first transistor is connected to the output switching sub-module. The emitter of the first transistor and the second end of the delay element are both grounded.

8. The inductive current detection circuit according to claim 6, wherein The detection control sub-unit includes a second transistor. The base of the second transistor is connected to the first control unit. The collector of the second transistor is connected to the detection switching sub-module. The base and the emitter of the second transistor are both grounded.

9. The inductive current detection circuit according to any one of claims 6-8, characterized in that The detection switching sub-module includes a first relay. The first relay includes a first coil, a first contact and a second contact. The first coil is respectively connected to the second auxiliary power supply and the detection control sub-unit; The detection control sub-unit is configured to control the first coil to be powered off when in the off state, so as to control the first contact and the second contact to be connected, making the detection switching sub-module conductive, and to power on the first coil through the second auxiliary power supply when in the on state, so as to control the first contact and the second contact to be disconnected, making the detection switching sub-module disconnected; The output switching sub-module includes a second relay. The second relay includes a second coil, a third contact and a fourth contact. The second coil is respectively connected to the first auxiliary power supply and the output control sub-unit; The output control sub-unit is used to control the power-off of the second coil when in the off state, so as to control the third contact and the fourth contact to be respectively connected to both ends of the first capacitor, making the first path conductive, and when in the on state, power on the second coil through the first auxiliary power supply, so as to control the third contact and the fourth contact to be connected to both ends of the second resistor, making the second path conductive.

10. A energy storage power supply, characterized in that, The energy storage power supply includes an inductor and the inductor current detection circuit according to any one of claims 1-9.

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