Inductive current detection circuit and energy storage power supply

Abstract

The invention relates to an inductive current detection circuit and an energy storage power supply. The current detection circuit comprises an RC detection module, a shunt detection module and a control module. The RC detection module is connected with an inductor in the inductance branch in parallel, the RC detection module comprises a first resistor and a first capacitor which are connected in series, the shunt detection module is arranged between the inductor and the output end of the inductance branch, the shunt detection module comprises a second resistor, and the control module is connected with the RC detection module and the shunt detection module. The control module is used for responding to the environment temperature of the inductor, controlling the RC detection module to be switched on under the condition that the environment temperature is smaller than a temperature threshold value, determining the inductive current of the inductor based on the electrical parameter of the first capacitor, and controlling the shunt detection module to be switched on under the condition that the environment temperature is not smaller than the temperature threshold value. And determining an inductive current based on the electrical parameter of the second resistor. By adopting the current detection circuit, the inductive current can be accurately detected.

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 submodule is used to control the detection switching submodule to be turned on when the ambient temperature is less than a temperature threshold, and to control the first path between the first capacitor and the output switching submodule to be turned on, so as to determine the inductor current based on the electrical parameters of the first capacitor; and to control the detection switching submodule to be turned off when the ambient temperature is not less than the temperature threshold, and to control the second path between the second resistor and the output switching submodule to be turned on, so as to determine the inductor current based on the electrical parameters of the second resistor.

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

[0011] The first control unit is configured to be in an off state when the ambient temperature is less than a temperature threshold so as to control the second control unit to be off, and to be in an on state when the ambient temperature is not less than the temperature threshold so as to control the second control unit to be on;

[0012] The second control unit is used for controlling the detection switching submodule and the first path to be turned on when the detection switching submodule is in the disconnected state, and for controlling the detection switching submodule to be turned off and the second path to be turned on when the detection switching submodule is in the turned-on state.

[0013] In one embodiment, the first control unit includes a temperature detection element and a first switch element; the temperature detection element is connected to the first auxiliary power supply and the first switch element respectively, the first auxiliary power supply is also connected to the output switching submodule, and the first switch 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 switch element to be disconnected when the ambient temperature is less than a temperature threshold, and to control the first switch element to be turned on through a 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, the first switch element includes a first diode, a cathode of the first diode is connected to the thermistor, and an anode of the first diode is connected to the second control unit.

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

[0017] The first control unit is also used to control the output control subunit and the detection control subunit to be disconnected when the ambient temperature is less than a temperature threshold, and to control 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 the turn-on time 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 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 submodule, 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 submodule, and the base of the second transistor and the emitter of the second transistor are both grounded.

[0020] In one of the embodiments, the detection switching submodule includes a first relay, the first relay includes a first coil, a first contact and a second contact, and the first coil is connected to the second auxiliary power supply and the detection control subunit respectively;

[0021] a detection control subunit, configured to control the first coil to be de-energized when in an off state, so as to control the first contact and the second contact to be connected, so as to turn on the detection switching submodule; and, when in an on state, to energize the first coil through a second auxiliary power supply, so as to control the first contact and the second contact to be disconnected, so as to turn off the detection switching submodule;

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

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

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

[0025] The above-mentioned 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, and the control module is connected to the RC detection module and the shunt detection module respectively. Since the control module can respond to the ambient temperature of the inductor, when the ambient temperature is less than the temperature threshold, the RC detection module is controlled to be turned on, and the inductor current of the inductor is determined based on the electrical parameters of the first capacitor, and when the ambient temperature is not less than the temperature threshold, the shunt detection module is controlled to be turned on, and the inductor current is determined based on the electrical parameters of the second resistor, therefore, the inductor current can be detected by the RC detection module when the temperature is low, and the inductor current can be detected by the shunt detection module in time when the temperature is high, which can not only reduce the situation where the RC detection module has a detection error due to temperature changes, but also reduce the loss caused by the second resistor in the shunt detection module to a certain extent, and the accuracy is good. BRIEF 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 drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a schematic diagram of an inductor current detection circuit in one embodiment;

[0028] Figure 2 is a schematic diagram of a control module in one embodiment;

[0029] Figure 3 is a schematic diagram of a control submodule in an embodiment;

[0030] Figure 4 is a schematic diagram of a first control unit in one embodiment;

[0031] Figure 5 is a schematic diagram of yet another inductor current detection circuit in an embodiment;

[0032] Figure 6 is a schematic diagram of a second control unit in one embodiment;

[0033] Figure 7 A schematic diagram of an energy storage power supply in an embodiment. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application 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 application and are not used to limit the present application.

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

[0036] The RC detection module 101 is connected in parallel with the inductor 200 in the inductor branch, and 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, and the shunt detection module 102 includes a second resistor 1021. The control module 103 is connected to the RC detection module 101 and the shunt detection module 102, respectively.

[0037] Furthermore, the control module 103 is used to respond to the ambient temperature of the inductor 200, and when the ambient temperature is less than the temperature threshold, control the RC detection module 101 to be turned on, and determine the inductor 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, control the shunt detection module 102 to be turned on, 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 lossless monitoring of the inductor current through an RC sensing network connected in parallel with the inductor 200, and 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 200 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 current passes through the inductor 200 by the RC detection module 101, the value of the inductor 200 will change due to temperature changes, so that the time constant corresponding to the first resistor 1011 and the first capacitor 1012 is different from the time constant corresponding to the inductor 200, thereby generating a detection error.

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

[0040] Therefore, the control module 103 needs to respond to the ambient temperature of the inductor 200, and control the operation of one of the RC detection module 101 or the shunt detection module 102 in response to the ambient temperature of the inductor 200. The ambient temperature can indicate that the inductor 200 causes the ambient temperature thereof due to the external environment or the heat generated by the inductor 200 itself. Optionally, the control module 103 can obtain the ambient temperature of the inductor 200 through a temperature sensor. The temperature threshold can be set according to actual needs.

[0041] Optionally, the control module 103 may include at least one switch element, wherein the switch element may 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 switch 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 switch 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. The electrical parameters include but are not limited to current or voltage.

[0043] In some embodiments, the control module 103 may also include but is not limited to a central processing unit (CPU), a digital signal processor (DSP), a field-programmable gate array (FPGA) or other programmable logic devices to perform the above-mentioned control through software logic.

[0044] In the above-mentioned inductor current detection circuit 100, the inductor 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 connected to the RC detection module 101 and the shunt detection module 102 respectively. Since the control module 103 can respond to the ambient temperature of the inductor 200, when the ambient temperature is less than the temperature threshold, the RC detection module 101 is controlled to be turned on, and the inductor current of the inductor 200 is determined based on the electrical parameters of the first capacitor 1012, and when the ambient temperature is not less than the temperature threshold, the shunt detection module 102 is controlled to be turned on, and the inductor current is determined based on the electrical parameters of the second resistor 1021. Therefore, when the temperature is low, the inductor current can be detected by the RC detection module 101, and when the temperature is high, the inductor current can be detected by the shunt detection module 102 in time, which can not only reduce the detection error of the RC detection module 101 caused by temperature changes, but also reduce the loss caused by the second resistor 1021 in the shunt detection module 102 to a certain extent, and the accuracy is better.

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

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

[0047] Furthermore, the control submodule 1033 is used to control the detection switching submodule 1031 to be turned on when the ambient temperature is less than the temperature threshold. Since the detection switching submodule 1031 is connected in parallel with the shunt detection module 102, the shunt detection module 102 is short-circuited, and therefore, the RC detection module 101 is put into the loop, and then the control submodule 1033 controls the first path between the first capacitor 1012 and the output switching submodule 1032 to be turned on, so as to determine the inductor current based on the electrical parameters of the first capacitor 1012, and realize the detection of the inductor current through the RC detection module 101.

[0048] In addition, the control submodule 1033 is also used to control the detection switching submodule 1031 to be disconnected when the ambient temperature is not less than the temperature threshold, so that the shunt detection module 102 is put into the loop. Then, the control submodule 1033 controls the second path between the second resistor 1021 and the output switching submodule 1032 to be turned on, so as to determine the inductor current based on the electrical parameters of the second resistor 1021, thereby realizing the detection of the inductor current through the shunt detection module 102.

[0049] Optionally, the detection switching submodule 1031 , the output switching submodule 1032 and the control submodule 1033 may respectively include at least one switch element, so as to implement the above process through the corresponding switch element.

[0050] It is understandable that the detection switching submodule 1031 is used to switch the detection mode of the inductor current. The output switching submodule 1032 is used to switch the output path of the inductor current to obtain the corresponding inductor current.

[0051] In the above-mentioned embodiment, the control module 103 includes a detection and switching submodule 1031, an output switching submodule 1032 and a control submodule 1033, and the control submodule 1033 is respectively connected to the detection and switching submodule 1031 and the output switching submodule 1032, the detection and switching submodule 1031 is connected in parallel with the shunt detection module 102, and the output switching submodule 1032 is respectively connected to the RC detection module 101 and the shunt detection module 102. Since the control submodule 1033 can control the detection switching submodule 1031 to be turned on when the ambient temperature is less than the temperature threshold, and control the first path between the first capacitor 1012 and the output switching submodule 1032 to be turned on, so as to determine the inductor current based on the electrical parameters of the first capacitor 1012, and control the detection switching submodule 1031 to be turned off when the ambient temperature is not less than the temperature threshold, and control the second path between the second resistor 1021 and the output switching submodule 1032 to be turned on, so as to determine the inductor current based on the electrical parameters of the second resistor 1021, the RC detection module 101 or the shunt detection module 102 can be switched to work in time 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 is a schematic diagram of a control submodule in an embodiment, such as Figure 3 As shown, in an exemplary embodiment, optionally, the control submodule 1033 includes interconnected first control unit 1033a and second control unit 1033b, and the second control unit 1033b is connected to the detection switching submodule 1031 and the output switching submodule 1032, respectively.

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

[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 a 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] Further, the second control unit 1033b can control the detection switching submodule 1031 and the first path to be turned on when the device is in the off state, so as 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. Moreover, the second control unit 1033b can control the detection switching submodule 1031 to be turned off and the second path to be turned on when the device is in the on state, so as 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 embodiment, the control submodule 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 submodule 1031 and the output switching submodule 1032. Since the first control unit 1033a can be in an off state when the ambient temperature is less than the temperature threshold to control the second control unit 1033b to be off, and in an on state when the ambient temperature is not less than the temperature threshold to control the second control unit 1033b to be on, and the second control unit 1033b can control the detection switching submodule 1031 and the first path to be on when it is in an off state, and control the detection switching submodule 1031 to be off and the second path to be on when it is in an on state, therefore, the corresponding detection mode can be flexibly and accurately determined based on the ambient temperature through the control submodule 1033.

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

[0058] The temperature detection element 402 is connected to the first auxiliary power supply 401 and the first switch element 403 respectively, the first auxiliary power supply 401 is also connected to the output switching submodule 1032, and the first switch 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, for example, a 5 volt (V) DC power supply. The first switch element 403 includes but is not limited to a transistor, a diode or a triode.

[0059] In addition, the resistance of the temperature detection element 402 is negatively correlated with the ambient temperature, that is, the higher the ambient temperature of the inductor 200 is, the smaller the resistance of the temperature detection element 402 is. 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 switch element 403 can be controlled by the resistance of the temperature detection element 402, so that the temperature detection element 402 controls the first switch element 403 to be disconnected when the ambient temperature is less than the temperature threshold, and controls the first switch element 403 to be turned on through the first auxiliary power supply 401 when the ambient temperature is not less than the temperature threshold. In other words, the temperature detection element 402 can disconnect the path between the first auxiliary power supply 401 and the first switch element 403 when its resistance is greater than the resistance threshold, so as to control the first switch element 403 to be turned off; the temperature detection element 402 can connect the path between the first auxiliary power supply 401 and the first switch element 403 when its resistance is greater than the resistance threshold, so as to control the first switch element 403 to be turned off through the first auxiliary power supply 401.

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

[0062] Figure 5 FIG. 1 is a schematic diagram of another inductor current detection circuit in an embodiment. Figure 5As shown, in an exemplary embodiment, optionally, the temperature detection element 402 includes a thermistor RT, the first switch element 403 includes a first diode DZ1, the cathode of the first diode DZ1 is connected to the thermistor RT, and the anode 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 voltage regulator diode.

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

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

[0065] The output control subunit 501 is connected to the first control unit 1033a and the detection control subunit 502 respectively. The output control subunit 501 is also connected to the output switching submodule 1032 . The detection control subunit 502 is also connected to the detection switching submodule 1031 .

[0066] Furthermore, the first control unit 1033a is also used to control 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 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 the turn-on time of the output control subunit 501.

[0067] It can be understood that when the output control subunit 501 and the detection control subunit 502 are both disconnected, it also means that the second control unit 1033b is in a disconnected state. In this case, the detection switching submodule 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 the output control subunit 501 and the detection control subunit 502 are both turned on, it also means that the second control unit 1033b is in the on state. In this case, the detection switching submodule 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 on-time of the detection control subunit 502 to be earlier than the on-time of the output control subunit 501, after the detection switching submodule 1031 connected to the detection control subunit 502 is disconnected first, the first path between the first capacitor 1012 and the output switching submodule 1032 will continue to be connected first, and after a period of delay, the second path between the second resistor 1021 and the output switching submodule 1032 will be connected. In other words, the disconnection of the detection switching submodule 1031 is earlier than the conduction of the second path. In this way, by first switching to the shunt detection module 102 for detection through the disconnection of the detection switching submodule 1031, 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 submodule 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 connected to the first control unit 1033a and the detection control subunit 502 respectively, the output control subunit 501 is also connected to the output switching submodule 1032, and the detection control subunit 502 is also connected to the detection switching submodule 1031. Since the first control unit 1033a is also used to control 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 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 the turn-on time of the output control subunit 501, it is possible not only to switch the corresponding detection mode in time according to the ambient temperature, but also to improve the relative continuity of the detected inductor current 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 trigger or other elements with a delay function. Please continue to refer to Figure 5 , the delay element may include capacitor C2.

[0072] The first end of the delay element is connected to the base of the first transistor Q1 and the first control unit 1033a respectively, the collector of the first transistor Q1 is connected to the output switching submodule 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 subunit 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 submodule 1032, and the emitter of the first transistor Q1 and the second end of the delay element are both grounded. Therefore, the first transistor Q1 can be controlled to be turned on later than the detection control subunit 502 through the delay element.

[0074] Please continue to refer to Figure 5 In an exemplary embodiment, optionally, the detection control subunit 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 submodule 1031, and the base of the second transistor Q2 and the emitter of the second transistor Q2 are both grounded.

[0075] In the above embodiment, since the detection control subunit 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 submodule 1031, and the base of the second transistor Q2 and the emitter of the second transistor Q2 are both grounded, therefore, the state of the second transistor Q2 can be timely controlled by the first control unit 1033a.

[0076] In an exemplary embodiment, optionally, the detection switching submodule 1031 includes a first relay RLY1. The first relay RLY1 includes a first coil, a first contact and a second contact, and the first coil is connected to the second auxiliary power supply VCC2 and the detection control subunit 502 respectively. 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 source VCC2 may also be any form of current source or voltage source. The second auxiliary power source VCC2 may be the same auxiliary power source as the first auxiliary power source 401 or may be a different auxiliary power source, which is not limited in this embodiment.

[0078] When the detection control subunit 502 is in the disconnected state, the path between the second auxiliary power source VCC2 and the first coil is disconnected by the detection control subunit 502, and the second auxiliary power source VCC2 cannot energize the first coil, thereby deenergizing the first coil. When the first coil is deenergized, the first contact and the second contact are connected, so that the detection switching submodule 1031 is turned on, so as to switch to the RC detection module 101 to detect the inductor current.

[0079] When the detection control subunit 502 is in the on state, the path between the second auxiliary power source VCC2 and the first coil is turned on by the detection control subunit 502, so that the first coil is powered on by the second auxiliary power source VCC2. When the first coil is powered on, the first contact and the second contact are disconnected, so that the detection switching submodule 1031 is turned off, so as to switch to the shunt detection module 102 to detect the inductor current.

[0080] In the above embodiment, the detection switching submodule 1031 includes a first relay RLY1, and 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 subunit 502. Since the detection control subunit 502 can control the coil to be powered off when it is in the disconnected state, so as to control the first contact and the second contact to be connected, so that the detection switching submodule 1031 is turned on, and when it is in the turned-on state, the coil is powered on by the second auxiliary power supply VCC2 to control the first contact and the second contact to be disconnected, so that the detection switching submodule 1031 is turned off, therefore, the RC detection module 101 and the shunt detection module 102 can be flexibly and efficiently switched to work through the first relay RLY1.

[0081] In an exemplary embodiment, the output switching submodule 1032 optionally 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 source 401 (ie, Figure 5 VCC1 in the output control subunit 501. Please continue to refer to Figure 5 , the third contact can be represented as pin 5 of the second relay RLY2, and the fourth contact can be represented as pin 8 of the second relay RLY2.

[0082] When the output control subunit 501 is in the disconnected state, the path between the first auxiliary power supply 401 and the second coil is disconnected by the output control subunit 501, and the first auxiliary power supply 401 cannot energize the second coil, thereby deenergizing the second coil. When the second coil is deenergized, the third contact and the fourth contact are respectively connected to the two ends of the first capacitor 1012, so that the first path is turned on to determine the inductor current based on the electrical parameters of the first capacitor 1012. In other words, the electrical parameters of the first capacitor 1012 can be obtained through the first path, so that the corresponding inductor current is 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 inductor current can be calculated based on the voltage across the first capacitor 1012.

[0083] When the output control subunit 501 is in the on state, the path between the first auxiliary power supply 401 and the second coil is turned on by the output control subunit 501, so that the second coil is energized through the first auxiliary power supply 401. When the second coil is energized, the third contact and the fourth contact are respectively connected to the two ends of the second resistor 1021, so that the second path is turned on to determine the inductor current based on the electrical parameters of the second resistor 1021. In other words, the electrical parameters of the second resistor 1021 can be obtained through the second path, so that the corresponding inductor current is 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 inductor current can be calculated based on the current of the second resistor 1021.

[0084] In the above embodiment, the output switching submodule 1032 includes a second relay RLY2, and the second relay RLY2 includes a second coil, a third contact, and a fourth contact, and the second coil is respectively connected to the first auxiliary power supply 401 and the output control subunit 501. Since the output control subunit 501 can control the second coil to be powered off when it is in the disconnected state, so as to control the third contact and the fourth contact to be respectively connected to the two ends of the first capacitor 1012, so that the first path is turned on, and when it is in the turned-on state, the second coil is powered on through the first auxiliary power supply 401, so as to control the third contact and the fourth contact to be connected to the two ends of the second resistor 1021, so that the second path is turned on, therefore, the acquisition mode of the inductor 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 inductor current detection circuit 100 may further include at least one of the following:

[0086] (1) Amplifying element U1B. 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 submodule 1032. Optionally, the first input terminal of the amplifying element U1B is connected to the third contact, the second input terminal of the amplifying element U1B is connected to the fourth contact, 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. A first end of the resistor R1 is connected to the negative electrode of the temperature detection element 402 and the first switch element 403, respectively, and a second end of the resistor R1 is grounded.

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

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

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

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

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

[0093] In order to more clearly describe the inductor current detection circuit 100 of the present application, Figure 5 For explanation. Figure 5 In the figure, L1 represents the inductor 200, IN represents the input end of the inductor branch, 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. The second resistor 1021 can be a low inductance tolerance shunt resistor.

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

[0095] Moreover, pin 3 of the first relay RLY1 is a normally closed pin, that is, when the coil of the first relay RLY1 is not energized, pin 3 of the first relay RLY1 is connected to pin 4. Therefore, when the ambient temperature of the inductor 200 is lower than the temperature threshold, the coil of the first relay RLY1 is not energized and is in a closed state.

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

[0097] Therefore, in this case of 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 current loss in the second resistor 1021.

[0098] When the ambient temperature of the inductor 200 is not lower than the temperature threshold, the voltage of the resistor R1 increases after the thermistor RT and the resistor R1 are divided, 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 delay role, the second transistor Q2 is turned on before the first transistor Q1, that is, the second transistor Q2 is turned on first, and the first relay RLY1 is disconnected first, and the shunt detection module 102 is connected to the main circuit. After the preset delay time, the first transistor Q1 is turned on, and the second relay RLY2 is switched to the path corresponding to the shunt detection module 102, completing the switching of the sampling mode.

[0100] It is understandable that when the first relay RLY1 is disconnected, the second resistor 1021 samples the current signal, and the first capacitor 1012 also samples the current signal. By switching to shunt current sensing, the sampling can be kept relatively continuous to avoid the loss of current sampling due to the shutdown of the relay.

[0101] It can be seen that the inductor current detection circuit 100 provided in 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 accuracy of the detection, but also avoid always using the shunt detection module 102, thereby reducing the current loss generated on the second resistor 1021, that is, the second resistor Rs, thereby reducing the power loss.

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

[0103] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and 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-mentioned methods. Among them, any reference to the 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), magnetic 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. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0104] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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, they should be considered to be within the scope of this application.

[0105] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An inductor current detection circuit, characterized in that: 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, and the control module is connected to the RC detection module and the shunt detection module respectively; The control module is used to respond to the ambient temperature of the inductor, when the ambient temperature is less than a temperature threshold, control the RC detection module to be turned on, and determine 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, control the shunt detection module to be turned on, and determine the inductor current based on the electrical parameters of the second resistor.

2. The inductor current detection circuit according to claim 1, characterized in that: The control module includes a detection switching submodule, an output switching submodule and a control submodule; The control submodule is connected to the detection switching submodule and the output switching submodule respectively, the detection switching submodule is connected in parallel with the shunt detection module, and the output switching submodule is connected to the RC detection module and the shunt detection module respectively; The control submodule is used to control the detection switching submodule to be turned on and control the first path between the first capacitor and the output switching submodule to be turned on 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 submodule to be turned off and control the second path between the second resistor and the output switching submodule to be turned on 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.

3. The inductor current detection circuit according to claim 2, characterized in that: The control submodule comprises a first control unit and a second control unit connected to each other, wherein the second control unit is connected to the detection switching submodule and the output switching submodule respectively; The first control unit is configured to be in an off state when the ambient temperature is less than the temperature threshold so as to control the second control unit to be off, and to be in an on state when the ambient temperature is not less than the temperature threshold so as to control the second control unit to be on; The second control unit is used to control the detection switching submodule and the first path to be turned on when in the disconnected state, and to control the detection switching submodule to be turned off and the second path to be turned on when in the turned-on state.

4. The inductor current detection circuit according to claim 3, characterized in that: The first control unit includes a temperature detection element and a first switch element; the temperature detection element is connected to a first auxiliary power supply and the first switch element respectively, the first auxiliary power supply is also connected to the output switching submodule, and the first switch 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; The temperature detection element is used to control the first switch element to be disconnected when the ambient temperature is lower than the temperature threshold, and to control the first switch element to be turned on through the first auxiliary power supply when the ambient temperature is not lower than the temperature threshold.

5. The inductor current detection circuit according to claim 4, characterized in that: The temperature detection element includes a thermistor, the first switch element includes a first diode, a cathode of the first diode is connected to the thermistor, and an anode of the first diode is connected to the second control unit.

6. The inductor current detection circuit according to claim 3, characterized in that: The second control unit includes an output control subunit and a detection control subunit; the output control subunit is connected to the first control unit and the detection control subunit respectively, the output control subunit is also connected to the output switching submodule, and the detection control subunit is also connected to the detection switching submodule; The first control unit is also used to control the output control subunit and the detection control subunit to be disconnected when the ambient temperature is lower than the temperature threshold, and to control the output control subunit and the detection control subunit to be turned on when the ambient temperature is not lower than the temperature threshold, and the turn-on time of the detection control subunit is earlier than the turn-on time of the output control subunit.

7. The inductor current detection circuit according to claim 6, characterized in that: The output control subunit 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 submodule, and the emitter of the first transistor and the second end of the delay element are both grounded.

8. The inductor current detection circuit according to claim 6, characterized in that: 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 submodule, and the base of the second transistor and the emitter of the second transistor are both grounded.

9. The inductor current detection circuit according to any one of claims 6 to 8, characterized in that: The detection switching submodule includes a first relay, the first relay includes a first coil, a first contact and a second contact, and the first coil is connected to the second auxiliary power supply and the detection control subunit respectively; The detection control subunit is used to control the first coil to be powered off when in an off state, so as to control the first contact and the second contact to be connected, so as to turn on the detection switching submodule; and to energize the first coil through the second auxiliary power supply when in an on state, so as to control the first contact and the second contact to be disconnected, so as to turn off the detection switching submodule; The output switching submodule includes a second relay, the second relay includes a second coil, a third contact and a fourth contact, and the second coil is connected to the first auxiliary power supply and the output control subunit respectively; The output control subunit is used to control the second coil to be powered off when in an off state, so as to control the third contact and the fourth contact to be respectively connected to the two ends of the first capacitor to make the first path conductive, and to power the second coil through the first auxiliary power supply when in an on state, so as to control the third contact and the fourth contact to be connected to the two ends of the second resistor to make the second path conductive.

10. An energy storage power supply, characterized in that: The energy storage power supply includes an inductor and an inductor current detection circuit as described in any one of claims 1-9.

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