Switching device parallel current sharing circuit and battery

Abstract

The utility model discloses a switching device parallel current-sharing circuit and a battery, and relates to the technical field of current-sharing circuits, for each switching device connected in parallel, through the cooperation of an amplification module, a comparison module and a control module corresponding to the switching device, under the condition that the current value of a current signal of the switching device is greater than a preset current threshold value, the current-sharing circuit is switched on; the current value of the current signal of the switching device is reduced, so that the current value of the current signal of the switching device is smaller than the preset current threshold value, and overheating damage of the switching device (such as an MOS tube) caused by the fact that the current value of the current signal of the switching device is larger than the preset current threshold value is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to current -sharing circuit technical field, concretely relates to a switch device parallel current -sharing circuit and battery. BACKGROUND

[0002] MOS tube is metal - oxide semiconductor field effect transistor, MOS tube has current threshold value, namely the maximum working current value that MOS tube allows to pass.

[0003] In prior art, in order to increase the maximum current limit of circuit, use multiple parallel MOS tubes to carry out current sharing, namely to each MOS tube input fixed control signal control MOS tube conduction.

[0004] But in actual production, applicant finds at least the following problems in prior art: due to the influence of interference signal, the current value of MOS tube in parallel MOS tube exceeds the current threshold value of MOS tube, leading to MOS tube overheat damage. UTILITY MODEL CONTENTS

[0005] The utility model provides a switch device parallel current -sharing circuit and battery, at least solve the problem that in prior art due to the influence of interference signal, the current value of MOS tube in parallel MOS tube exceeds the current threshold value of MOS tube, leading to MOS tube overheat damage.

[0006] In order to solve the above technical problem, the utility model is realized as follows:

[0007] Firstly, the utility model provides a switch device parallel current -sharing circuit, including multiple parallel switch devices, multiple sampling resistors, multiple amplification modules, multiple comparison modules, multiple control modules, every switch device has corresponding sampling resistor, amplification module, comparison module, control module;

[0008] The switch device is electrically connected with the input end of the switch device parallel current -sharing circuit;

[0009] The sampling resistor is electrically connected with the output end of the switch device parallel current -sharing circuit, the switch device corresponding to the sampling resistor and the amplification module respectively, and the sampling resistor is used to collect the current signal of the switch device;

[0010] The amplification module is electrically connected with the comparison module corresponding to the amplification module;

[0011] The comparison module is electrically connected with the control module corresponding to the comparison module;

[0012] The control module is electrically connected with the switching device corresponding to the control module;

[0013] The switching device corresponding to the amplification module, the comparison module and the control module are matched, and are configured to reduce the current value of the current signal when the current value of the current signal is greater than a preset current threshold.

[0014] Optionally, the amplification module comprises a first operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; a first end of the first resistor is electrically connected with a first end of a sampling resistor corresponding to the amplification module, and a second end of the first resistor is electrically connected with an inverting input end of the first operational amplifier; a first end of the second resistor is electrically connected with a second end of the sampling resistor corresponding to the amplification module, and a second end of the second resistor is electrically connected with a non-inverting input end of the first operational amplifier; a first end of the third resistor is electrically connected with the inverting input end of the first operational amplifier, and a second end of the third resistor is electrically connected with a first end of the fourth resistor; a second end of the fourth resistor is electrically connected with an output end of the first operational amplifier; a first end of the fifth resistor is electrically connected with the non-inverting input end of the first operational amplifier, and a second end of the fifth resistor is electrically connected with a first end of the sixth resistor; a second end of the sixth resistor is grounded; and the output end of the first operational amplifier is electrically connected with a first input end of a comparison module corresponding to the amplification module.

[0015] Optionally, the comparison module comprises a second operational amplifier, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor and a first diode; a first end of the seventh resistor is electrically connected with an output end of an amplification module corresponding to the comparison module, and a second end of the seventh resistor is electrically connected with a non-inverting input end of the second operational amplifier; a first end of the eighth resistor is configured to receive a preset reference voltage signal, and a second end of the eighth resistor is electrically connected with the non-inverting input end of the second operational amplifier; a first end of the ninth resistor is electrically connected with an inverting input end of the second operational amplifier, and a second end of the ninth resistor is grounded; an output end of the second operational amplifier is electrically connected with a negative electrode of the first diode; a positive electrode of the first diode is electrically connected with a first end of the tenth resistor; and a second end of the tenth resistor is electrically connected with a first input end of a control module corresponding to the comparison module.

[0016] Optionally, the comparison module further comprises a first capacitor, a second capacitor and an eleventh resistor; a first end of the first capacitor is electrically connected with an output end of the second operational amplifier, and a second end of the first capacitor is electrically connected with a first end of the tenth resistor; a first end of the eleventh resistor is electrically connected with the output end of the second operational amplifier, a second end of the eleventh resistor is electrically connected with a first end of the second capacitor, and a second end of the second capacitor is electrically connected with an inverting input end of the second operational amplifier.

[0017] Optionally, the control module comprises a third operational amplifier, a fourth operational amplifier, a twelfth resistor, a thirteenth resistor, a fourteenth resistor and a fifteenth resistor; a first end of the twelfth resistor is configured to receive a preset control signal, and a second end of the twelfth resistor is electrically connected with a non-inverting input end of the third operational amplifier; an inverting input end of the third operational amplifier is electrically connected with an output end of the third operational amplifier, and the output end of the third operational amplifier is electrically connected with a first end of the thirteenth resistor; a second end of the thirteenth resistor is electrically connected with an output end of a corresponding comparison module of the control module and a non-inverting input end of the fourth operational amplifier; an inverting input end of the fourth operational amplifier is electrically connected with an output end of the fourth operational amplifier, and the output end of the fourth operational amplifier is electrically connected with a first end of the fourteenth resistor; a second end of the fourteenth resistor is electrically connected with a first end of the fifteenth resistor; and a second end of the fifteenth resistor is electrically connected with a control end of a corresponding switching device of the control module.

[0018] Optionally, the control module further comprises a second diode and a third capacitor; a positive electrode of the second diode is electrically connected with the first end of the fifteenth resistor, and a negative electrode of the second diode is electrically connected with the output end of the fourth operational amplifier; a first end of the third capacitor is electrically connected with the output end of the fourth operational amplifier, and a second end of the third capacitor is electrically connected with the first end of the fifteenth resistor.

[0019] Optionally, a first end of the switching device is electrically connected with an input end of a parallel current sharing circuit of the switching device, a second end of the switching device is electrically connected with a first end of a sampling resistor corresponding to the switching device, and a control end of the switching device is electrically connected with an output end of a corresponding control module of the switching device; the first end of the sampling resistor corresponding to the switching device is electrically connected with a first input end of an amplification module corresponding to the switching device, and a second end of the sampling resistor corresponding to the switching device is electrically connected with an output end of the parallel current sharing circuit of the switching device and a second input end of the amplification module corresponding to the switching device.

[0020] Optionally, the input end of the switch device parallel current sharing circuit is electrically connected with the positive pole of the first power supply, and the output end of the switch device parallel current sharing circuit is electrically connected with the negative pole of the first power supply; or the input end of the switch device parallel current sharing circuit is electrically connected with the positive pole of the second power supply which charges the first power supply, and the output end of the switch device parallel current sharing circuit is electrically connected with the positive pole of the first power supply, wherein the negative pole of the first power supply is electrically connected with the negative pole of the second power supply.

[0021] Optionally, the switch device is a MOS tube.

[0022] In a second aspect, the utility model also provides a battery, including the switch device parallel current sharing circuit of as first aspect.

[0023] In the utility model embodiment, for each switch device in parallel, through the cooperation of the switch device corresponding amplification module, comparison module and control module, in the case that the current value of the current signal of the switch device is greater than the preset current threshold, the current value of the current signal of the switch device is reduced, so that the current value of the current signal of the switch device is less than the preset current threshold, to avoid the current value of the current signal of the switch device (for example MOS tube) greater than the preset current threshold and cause the switch device to overheat and damage. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be briefly introduced the drawings needed to be used in the description of the utility model embodiment, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without paying the creative labor.

[0025] Figure 1 The utility model embodiment provides a kind of structure schematic diagram of switch device parallel current sharing circuit;

[0026] Figure 2 The utility model embodiment provides the specific structure schematic diagram of switch device and switch device corresponding sampling resistance, amplification module, comparison module, control module;

[0027] Figure 3 The utility model embodiment provides the working flow schematic diagram of switch device parallel current sharing circuit.

[0028] REFERENCE NUMERALS:

[0029] 10 - switching device; 11 - input end of the switching device parallel current sharing circuit; 12 - output end of the switching device parallel current sharing circuit; 20 - sampling resistor; 30 - amplification module; 40 - comparison module; 41 - second input end of the comparison module; 50 - control module; 51 - second input end of the control module. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purpose, features and advantages of the present application more apparent, comprehensible and easily understood, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0031] With reference to Figure 1 The embodiment of the present application provides a switching device parallel current sharing circuit, which comprises a plurality of parallel switching devices 10, a plurality of sampling resistors 20, a plurality of amplification modules 30, a plurality of comparison modules 40 and a plurality of control modules 50. Each of the switching devices 10 has a corresponding sampling resistor 20, amplification module 30, comparison module 40 and control module 50. The switching device 10 is electrically connected with the input end 11 of the switching device parallel current sharing circuit. The sampling resistor 20 is electrically connected with the output end 12 of the switching device parallel current sharing circuit, the switching device 10 corresponding to the sampling resistor 20 and the amplification module 30, respectively. The sampling resistor 20 is used for collecting the current signal of the switching device 10. The amplification module 30 is electrically connected with the comparison module 40 corresponding to the amplification module 30. The comparison module 40 is electrically connected with the control module 50 corresponding to the comparison module 40. The control module 50 is electrically connected with the switching device 10 corresponding to the control module 50. The amplification module 30, comparison module 40 and control module 50 corresponding to the switching device 10 are cooperated, and used for reducing the current value of the current signal when the current value of the current signal is greater than a preset current threshold.

[0032] It should be noted that the amplification module 30 is used to convert the current signal of the switching device 10 into a voltage signal and amplify, output an amplified voltage signal; the first input end of the comparison module 40 is electrically connected with the output end of the comparison module 40 corresponding to the amplification module 30, the comparison module 40 is used to receive the reference voltage signal provided by the reference power supply through the second input end 41 of the comparison module 40, and output a comparison voltage signal according to the amplified voltage signal and the reference voltage signal. Specifically, the voltage of the amplified voltage signal is opposite to the voltage of the reference voltage signal, that is, the voltage of the amplified voltage signal is negative voltage, and the voltage of the reference voltage signal is positive voltage. In the case that the voltage value of the amplified voltage signal is greater than the voltage value of the reference voltage signal, it indicates that the current value of the current signal is greater than the preset current threshold. The amplified voltage signal and the reference voltage signal are superimposed, and the comparison module 40 outputs a low-level comparison voltage signal. In the case that the voltage value of the amplified voltage signal is less than or equal to the voltage value of the reference voltage signal, it indicates that the current value of the current signal is less than or equal to the preset current threshold. The amplified voltage signal and the reference voltage signal are superimposed, and the comparison module 40 outputs a high-level comparison voltage signal.

[0033] The first input end of the control module 50 is electrically connected with the output end of the comparison module 40, and the control module 50 is used to receive the initial control signal provided by the external chip through the second input end 51 of the control module 50, and generate a control signal according to the initial control signal and the comparison voltage signal. Specifically, in the case that the voltage value of the initial control signal is greater than the voltage value of the comparison voltage signal (i.e. the low-level comparison voltage signal), the voltage value of the output control signal is the average value of the voltage value of the initial control signal and the voltage value of the comparison voltage signal, that is, the voltage value of the control signal is less than the voltage value of the initial control signal. In the case that the voltage value of the initial control signal is less than the voltage value of the comparison voltage signal (high-level comparison voltage signal), the voltage value of the output control signal is the voltage value of the initial control signal. The voltage value of the control signal is positively correlated with the current signal of the switching device 10. For example, the switching device 10 is an NMOS tube (Negative channel-Metal-Oxide-Semiconductor, negative channel metal oxide semiconductor tube), and the gate voltage value of the NMOS tube working in the amplification zone is positively correlated with the current amplification factor of the NMOS tube. Therefore, in the case that the current value of the current signal of the switching device 10 is greater than the preset current threshold, the voltage value of the control signal is reduced, so that the current value of the current signal of the switching device 10 is reduced, so that the current value of the current signal of the switching device 10 is less than the preset current threshold.

[0034] In the embodiment of the utility model, for each switch device 10 in parallel, through the cooperation of the corresponding amplification module 30, comparison module 40, control module 50 of switch device 10, in the case that the current value of the current signal of switch device 10 is greater than the preset current threshold, the current value of the current signal of switch device 10 is reduced, so that the current value of the current signal of switch device 10 is less than the preset current threshold, to avoid the current value of the current signal of switch device 10 (for example MOS tube) overheating damage caused by being greater than the preset current threshold.

[0035] Optionally, in some embodiments, the switch device 10 is a MOS tube.

[0036] It should be noted that the model of each switch device 10 is the same.

[0037] Specifically, the switch device 10 is an NMOS tube, the switch device 10 works in the amplification zone, the drain of the switch device 10 is electrically connected with the input end 11 of the switch device parallel current sharing circuit, the source of the switch device 10 is electrically connected with the first end of the sampling resistor 20 corresponding to the switch device 10, and the gate of the switch device 10 is electrically connected with the output end of the control module 50.

[0038] In the embodiment of the utility model, by reducing the voltage value of the gate of the switch device 10 in the case that the current value of the current signal of the switch device 10 is greater than the preset current threshold, the current value of the current signal of the switch device 10 is reduced, so that the current value of the current signal of the switch device 10 is less than the preset current threshold.

[0039] Optionally, refer to Figure 2In some embodiments, the amplification module 30 comprises a first operational amplifier U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The first end of the first resistor R1 is electrically connected to the first end of the sampling resistor 20 corresponding to the amplification module 30, and the second end of the first resistor R1 is electrically connected to the inverting input terminal of the first operational amplifier U1. The first end of the second resistor R2 is electrically connected to the second end of the sampling resistor 20 corresponding to the amplification module 30, and the second end of the second resistor R2 is electrically connected to the non-inverting input terminal of the first operational amplifier U1. The first end of the third resistor R3 is electrically connected to the inverting input terminal of the first operational amplifier U1, and the second end of the third resistor R3 is electrically connected to the first end of the fourth resistor R4. The second end of the fourth resistor R4 is electrically connected to the output terminal of the first operational amplifier U1. The first end of the fifth resistor R5 is electrically connected to the non-inverting input terminal of the first operational amplifier U1, and the second end of the fifth resistor R5 is electrically connected to the first end of the sixth resistor R6. The second end of the sixth resistor R6 is grounded. The output terminal of the first operational amplifier U1 is electrically connected to the first input terminal of the comparison module 40 corresponding to the amplification module 30.

[0040] In some embodiments, the amplification module 30 further comprises a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, and a tenth capacitor C10. The positive electrode of the first operational amplifier U1 is electrically connected to the positive electrode of the third power supply, and the negative electrode of the first operational amplifier U1 is electrically connected to the negative electrode of the third power supply. The first end of the sixth capacitor C6 is electrically connected to the first end of the first resistor R1, and the second end of the sixth capacitor C6 is electrically connected to the first end of the second resistor R2. The first end of the seventh capacitor C7 is electrically connected to the second end of the second resistor R2, and the second end of the seventh capacitor C7 is grounded. The first end of the eighth capacitor C8 is electrically connected to the second end of the fourth resistor R4, and the second end of the eighth capacitor C8 is electrically connected to the first end of the third resistor R3. The first end of the ninth capacitor C9 is electrically connected to the positive electrode of the third power supply, and the second end of the ninth capacitor C9 is grounded. The first end of the tenth capacitor C10 is electrically connected to the negative electrode of the third power supply, and the second end of the tenth capacitor C10 is grounded.

[0041] It should be noted that the first operational amplifier U1, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 constitute a differential amplifier circuit. The first resistor R1 and the second resistor R2 are input resistors, the third resistor R3 and the fourth resistor R4 are feedback resistors, and the fifth resistor R5 and the sixth resistor R6 are pull-down resistors. The sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, and the tenth capacitor C10 are all filter capacitors.

[0042] In the embodiment of the utility model, the current signal of the switch device 10 is converted into a voltage signal and amplified by the first operational amplifier U1, and an amplified voltage signal is output.

[0043] Optionally, in some embodiments, the comparison module 40 comprises a second operational amplifier U2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a first diode D1; the first end of the seventh resistor R7 is electrically connected to the output end of the amplification module 30 corresponding to the comparison module 40, and the second end of the seventh resistor R7 is electrically connected to the non-inverting input end of the second operational amplifier U2; the first end of the eighth resistor R8 is used for receiving a preset reference voltage signal, and the second end of the eighth resistor R8 is electrically connected to the non-inverting input end of the second operational amplifier U2; the first end of the ninth resistor R9 is electrically connected to the inverting input end of the second operational amplifier U2, and the second end of the ninth resistor R9 is grounded; the output end of the second operational amplifier U2 is electrically connected to the negative electrode of the first diode D1; the positive electrode of the first diode D1 is electrically connected to the first end of the tenth resistor R10; and the second end of the tenth resistor R10 is electrically connected to the first input end of the control module 50 corresponding to the comparison module 40.

[0044] In some embodiments, the comparison module 40 further comprises an eleventh capacitor C11, the first end of the eleventh capacitor C11 is electrically connected to the inverting input end of the second operational amplifier U2, and the second end of the eleventh capacitor C11 is grounded.

[0045] It should be noted that the first end of the seventh resistor R7 is the first input end of the comparison module 40, and the first end of the eighth resistor R8 is the second input end 41 of the comparison module 40; the seventh resistor R7 and the eighth resistor R8 are input resistors, the ninth resistor R9 is a pull-down resistor, and the tenth resistor R10 is a voltage dividing resistor; and the eleventh capacitor C11 is a filter capacitor.

[0046] In the embodiment of the utility model, through the same phase input end of second operational amplifier U2 receives the reference voltage signal and amplification voltage signal provided by reference power supply, the voltage of amplification voltage signal is opposite with the voltage of reference voltage signal, namely the voltage of amplification voltage signal is negative voltage, the voltage of reference voltage signal is positive voltage, under the condition that the voltage value of amplification voltage signal is greater than the voltage value of reference voltage signal, it is explained that the current value of current signal is greater than preset current threshold, the amplification voltage signal is superimposed with reference voltage signal, obtains the input voltage signal of the same phase input end of second operational amplifier U2, the voltage value of the input voltage signal of the same phase input end of second operational amplifier U2 is the difference value of the voltage value of amplification voltage signal and the voltage value of reference voltage signal, the voltage of the input voltage signal of the same phase input end of second operational amplifier U2 is negative voltage, and second operational amplifier U2 outputs low level comparison voltage signal;Under the condition that the voltage value of amplification voltage signal is less than or equal to the voltage value of reference voltage signal, it is explained that the current value of current signal is less than or equal to preset current threshold, the amplification voltage signal is superimposed with reference voltage signal, obtains the input voltage signal of the same phase input end of second operational amplifier U2, the voltage value of the input voltage signal of the same phase input end of second operational amplifier U2 is the difference value of the voltage value of reference voltage signal and the voltage value of amplification voltage signal, the voltage of the input voltage signal of the same phase input end of second operational amplifier U2 is positive voltage, and second operational amplifier U2 outputs high level comparison voltage signal.

[0047] Optionally, in some embodiments, the comparison module 40 further includes a first capacitor C1, a second capacitor C2, and an eleventh resistor R11; a first end of the first capacitor C1 is electrically connected to an output end of the second operational amplifier U2, and a second end of the first capacitor C1 is electrically connected to a first end of the tenth resistor R10; a first end of the eleventh resistor R11 is electrically connected to the output end of the second operational amplifier U2, a second end of the eleventh resistor R11 is electrically connected to a first end of the second capacitor C2, and a second end of the second capacitor C2 is electrically connected to an inverting input end of the second operational amplifier U2.

[0048] In the embodiment of the utility model, the first capacitor C1 is a voltage stabilizing capacitor, the second capacitor C2 and the eleventh resistor R11 form an RC (resistor-capacitor) circuit.

[0049] Optionally, the control module 50 comprises a third operational amplifier U3, a fourth operational amplifier U4, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15; the first end of the twelfth resistor R12 is configured to receive a preset control signal, and the second end of the twelfth resistor R12 is electrically connected with the non-inverting input terminal of the third operational amplifier U3; the inverting input terminal of the third operational amplifier U3 is electrically connected with the output terminal of the third operational amplifier U3, and the output terminal of the third operational amplifier U3 is electrically connected with the first end of the thirteenth resistor R13; the second end of the thirteenth resistor R13 is electrically connected with the output terminal of the corresponding comparison module 40 of the control module 50 and the non-inverting input terminal of the fourth operational amplifier U4, respectively; the inverting input terminal of the fourth operational amplifier U4 is electrically connected with the output terminal of the fourth operational amplifier U4, and the output terminal of the fourth operational amplifier U4 is electrically connected with the first end of the fourteenth resistor R14; the second end of the fourteenth resistor R14 is electrically connected with the first end of the fifteenth resistor R15; and the second end of the fifteenth resistor R15 is electrically connected with the control terminal of the corresponding switching device 10 of the control module 50.

[0050] In some embodiments, the control module 50 further comprises a twelfth capacitor C12 and a thirteenth capacitor C13; the positive electrode of the third operational amplifier U3 is electrically connected with the positive electrode of a third power supply, and the negative electrode of the third operational amplifier U3 is electrically connected with the negative electrode of the third power supply; the first end of the twelfth capacitor C12 is electrically connected with the positive electrode of the third power supply, and the second end of the twelfth capacitor C12 is grounded; and the first end of the thirteenth capacitor C13 is electrically connected with the negative electrode of the third power supply, and the second end of the thirteenth capacitor C13 is grounded.

[0051] It should be noted that the non-inverting input terminal of the fourth operational amplifier U4 is the first input terminal of the control module 50, and the first end of the twelfth resistor R12 is the second input terminal 51 of the control module 50; the third operational amplifier U3 and the fourth operational amplifier U4 are voltage followers, the twelfth resistor R12 is an input resistor, the thirteenth resistor R13 is an output resistor, the fourteenth resistor R14 is an output resistor, and the fifteenth resistor R15 is an input resistor; the twelfth capacitor C12 and the thirteenth capacitor C13 are filter capacitors.

[0052] In the embodiment of the utility model, through the same phase input end of third operational amplifier U3 receives initial control signal, third operational amplifier U3 outputs initial control signal, in the voltage value of initial control signal is greater than the voltage value of comparison voltage signal (namely low level comparison voltage signal) condition, the voltage value of control signal that fourth operational amplifier U4 exports is the average of the voltage value of initial control signal and the voltage value of comparison voltage signal, namely the voltage value of control signal is less than the voltage value of initial control signal, in the voltage value of initial control signal is less than the voltage value of comparison voltage signal (high level comparison voltage signal) condition, the voltage value of control signal that fourth operational amplifier U4 exports is the voltage value of initial control signal, and the voltage value of control signal is positively related with the current signal of switching device 10, for example, the switching device 10 is NMOS pipe (Negative channel-Metal-Oxide-Semiconductor, negative channel metal oxide semiconductor pipe), and the gate voltage value of NMOS pipe working in amplification area is positively related with the current amplification multiple of NMOS pipe, therefore, in the current value of current signal of switching device 10 is greater than the preset current threshold condition, reduce the voltage value of control signal, so that the voltage value of control end of switching device 10 reduces, and the current value of current signal of switching device 10 reduces, thereby making the current value of current signal of switching device 10 less than the preset current threshold.

[0053] Optionally, in some embodiments, the control module 50 further comprises a second diode D2 and a third capacitor C3; the positive electrode of the second diode D2 is electrically connected with the first end of the fifteenth resistor R15, and the negative electrode of the second diode D2 is electrically connected with the output end of the fourth operational amplifier U4; the first end of the third capacitor C3 is electrically connected with the output end of the fourth operational amplifier U4, and the second end of the third capacitor C3 is electrically connected with the first end of the fifteenth resistor R15.

[0054] In the embodiment of the utility model, the third capacitor C3 and the fourteenth resistor R14 cooperate to play a role in adjusting the voltage and current stability of the control end of the switching device 10, and the second diode D2 plays a role in adjusting the response time of the turn-off of the switching device 10.

[0055] Optionally, in some embodiments, the first end of the switching device 10 is electrically connected with the input end 11 of the switching device parallel current sharing circuit, the second end of the switching device 10 is electrically connected with the first end of the sampling resistor 20 corresponding to the switching device 10, and the control end of the switching device 10 is electrically connected with the output end of the control module 50 corresponding to the switching device 10; the first end of the sampling resistor 20 corresponding to the switching device 10 is electrically connected with the first input end of the amplification module 30 corresponding to the switching device 10, and the second end of the sampling resistor 20 corresponding to the switching device 10 is respectively electrically connected with the output end 12 of the switching device parallel current sharing circuit and the second input end of the amplification module 30 corresponding to the switching device 10.

[0056] In the embodiment of the utility model, the current signal of the switching device 10 corresponding to the sampling resistor 20 is collected by the sampling resistor 20, so that the amplification module 30, the comparison module 40 and the control module 50 corresponding to the switching device 10 cooperate, and in the case that the current value of the current signal is greater than the preset current threshold value, the current value of the current signal is reduced, so that the current value of the current signal of the switching device 10 is less than the preset current threshold value.

[0057] Optionally, in some embodiments, the input end 11 of the switching device parallel current sharing circuit is used for being electrically connected with the positive pole of the first power supply, and the output end 12 of the switching device parallel current sharing circuit is used for being electrically connected with the negative pole of the first power supply; or: the input end 11 of the switching device parallel current sharing circuit is used for being electrically connected with the positive pole of the second power supply for charging the first power supply, and the output end 12 of the switching device parallel current sharing circuit is used for being electrically connected with the positive pole of the first power supply, wherein the negative pole of the first power supply is electrically connected with the negative pole of the second power supply.

[0058] In the embodiment of the utility model, in the case that the input end 11 of the switching device parallel current sharing circuit is electrically connected with the positive pole of the first power supply, and the output end 12 of the switching device parallel current sharing circuit is electrically connected with the negative pole of the first power supply, the switching device 10 is used as the load of the first power supply, so that the performance of the first power supply when discharging is tested by the staff, and in the case that the input end 11 of the switching device parallel current sharing circuit is electrically connected with the positive pole of the second power supply for charging the first power supply, the output end 12 of the switching device parallel current sharing circuit is electrically connected with the positive pole of the first power supply, and the negative pole of the first power supply is electrically connected with the negative pole of the second power supply, the charging current of the second power supply for charging the first power supply is controlled through the switching device parallel current sharing circuit, so that the performance of the first power supply when charging is tested by the staff.

[0059] The performance of the first power supply includes the power of the first power supply, the current accuracy of the first power supply, the voltage accuracy of the first power supply, the overcurrent protection of the first power supply, the short-circuit protection of the first power supply, and the like.

[0060] In some embodiments, the switch device parallel current sharing circuit further comprises a fourth capacitor C4, a fifth capacitor C5, and a sixteenth resistor R16, a first end of the sixteenth resistor R16 is configured to be electrically connected with the input end 11 of the switch device parallel current sharing circuit, a second end of the sixteenth resistor R16 is electrically connected with a first end of the fourth capacitor C4, a second end of the fourth capacitor C4 is electrically connected with a first end of the sampling resistor 20; a first end of the fifth capacitor C5 is electrically connected with the first end of the sampling resistor 20, and a second end of the fifth capacitor C5 is electrically connected with a second end of the sampling resistor 20.

[0061] In the embodiments of the utility model, the fifth capacitor C5 is a filter capacitor, the fourth capacitor C4 and the sixteenth resistor R16 cooperate to stabilize the current and voltage of the switch device 10.

[0062] Specifically, in some embodiments, the switch device 10 is an NMOS tube, the switch device 10 works in an amplification zone, a drain of the switch device 10 is electrically connected with the input end 11 of the switch device parallel current sharing circuit, a source of the switch device 10 is electrically connected with a first end of the sampling resistor 20 corresponding to the switch device 10, and a gate of the switch device 10 is electrically connected with a second end of the fifteenth resistor R15 corresponding to the switch device 10; a second end of the sampling resistor 20 is electrically connected with an output end 12 of the switch device parallel current sharing circuit; a first end of the first resistor R1 is electrically connected with a first end of the sampling resistor 20 corresponding to the first resistor R1, and a second end of the first resistor R1 is electrically connected with an inverting input end of the first operational amplifier U1; a first end of the second resistor R2 is electrically connected with a second end of the sampling resistor 20, and a second end of the second resistor R2 is electrically connected with a non-inverting input end of the first operational amplifier U1; a first end of the third resistor R3 is electrically connected with the inverting input end of the first operational amplifier U1, and a second end of the third resistor R3 is electrically connected with a first end of the fourth resistor R4; a second end of the fourth resistor R4 is electrically connected with an output end of the first operational amplifier U1; a first end of the fifth resistor R5 is electrically connected with the non-inverting input end of the first operational amplifier U1, and a second end of the fifth resistor R5 is electrically connected with a first end of the sixth resistor R6; a second end of the sixth resistor R6 is grounded; the output end of the first operational amplifier U1 is electrically connected with a first end of the seventh resistor R7 corresponding to the first operational amplifier U1;

[0063] A first end of the seventh resistor R7 is electrically connected with an output end of the first operational amplifier U1 corresponding to the seventh resistor R7, a second end of the seventh resistor R7 is electrically connected with a non-inverting input end of the second operational amplifier U2; a first end of the eighth resistor R8 is used for receiving a preset reference voltage signal, a second end of the eighth resistor R8 is electrically connected with the non-inverting input end of the second operational amplifier U2; a first end of the ninth resistor R9 is electrically connected with an inverting input end of the second operational amplifier U2, a second end of the ninth resistor R9 is grounded; an output end of the second operational amplifier U2 is electrically connected with a negative electrode of the first diode D1; a positive electrode of the first diode D1 is electrically connected with a first end of the tenth resistor R10; a second end of the tenth resistor R10 is electrically connected with a non-inverting input end of the fourth operational amplifier U4 corresponding to the tenth resistor R10;

[0064] A first end of the twelfth resistor R12 is used for receiving a preset control signal, a second end of the twelfth resistor R12 is electrically connected with a non-inverting input end of the third operational amplifier U3; an inverting input end of the third operational amplifier U3 is electrically connected with an output end of the third operational amplifier U3, the output end of the third operational amplifier U3 is electrically connected with a first end of the thirteenth resistor R13; a second end of the thirteenth resistor R13 is electrically connected with a second end of the tenth resistor R10 corresponding to the thirteenth resistor R13 and a non-inverting input end of the fourth operational amplifier U4; an inverting input end of the fourth operational amplifier U4 is electrically connected with an output end of the fourth operational amplifier U4, the output end of the fourth operational amplifier U4 is electrically connected with a first end of the fourteenth resistor R14; a second end of the fourteenth resistor R14 is electrically connected with a first end of the fifteenth resistor R15.

[0065] Optionally, with reference to Figure 3 In some embodiments, the working process of the parallel switch device current sharing circuit includes: X1, input current is divided by the parallel switch device 10, that is, input current is input to the input end of the parallel switch device current sharing circuit and is divided by the parallel switch device 10; X2, the current signal of the switch device 10 is collected, that is, the current signal of the switch device 10 is collected through the sampling resistor 20; X3, the current signal is amplified, that is, the current signal of the switch device 10 is converted into a voltage signal and amplified through the amplification module 30, and an amplified voltage signal is output; X4, the amplified voltage signal and the reference voltage signal are superimposed to generate a comparison voltage signal, that is, the reference voltage signal provided by the reference power supply is received through the comparison module 40, and the comparison voltage signal is output according to the amplified voltage signal and the reference voltage signal; X5, the comparison voltage signal is input to the control module 50, that is, the initial control signal provided by the external chip is received through the control module 50, and the control signal is generated according to the initial control signal and the comparison voltage signal, and the specific implementation process is similar to the foregoing, which will not be described here.

[0066] The utility model further provides a kind of battery, including the parallel switch device current sharing circuit as described above.

[0067] The specific implementation of the switch device parallel current sharing circuit in the battery is similar to the foregoing, which will not be described here.

[0068] Through the embodiments of the utility model, the current distribution of the input switch device parallel current sharing circuit is uniform, which is beneficial to improve the stability and reliability of the circuit, and improve the output capacity and efficiency of the circuit, and through the cooperation of the amplification module 30, the comparison module 40 and the control module 50, the current can be accurately and real-timely adjusted, and the service life of the switch device 10 is improved.

[0069] To sum up, in the embodiments of the utility model, for each switch device 10 in parallel, through the cooperation of the corresponding amplification module 30, comparison module 40 and control module 50 of the switch device 10, in the case that the current value of the current signal of the switch device 10 is greater than the preset current threshold value, the current value of the current signal of the switch device 10 is reduced, so that the current value of the current signal of the switch device 10 is less than the preset current threshold value, so as to avoid the overheating damage of the switch device 10 (such as MOS tube) caused by the current value of the current signal of the switch device 10 being greater than the preset current threshold value.

[0070] Finally, it should also be noted that in this document, relational terms such as "first" and "second", and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", "includes", "including", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0071] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

[0072] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A parallel current sharing circuit for a switching device, characterized by, The parallel switch device (10) has a corresponding sampling resistor (20), an amplification module (30), a comparison module (40), and a control module (50); The switch device (10) is electrically connected with the input end (11) of the parallel switch device current sharing circuit; The sampling resistor (20) is electrically connected with the output end (12) of the parallel switch device current sharing circuit, the switch device (10) corresponding to the sampling resistor (20), and the amplification module (30), and the sampling resistor (20) is used for collecting the current signal of the switch device (10); The amplification module (30) is electrically connected with the comparison module (40) corresponding to the amplification module (30); The comparison module (40) is electrically connected with the control module (50) corresponding to the comparison module (40); The control module (50) is electrically connected with the switch device (10) corresponding to the control module (50); The amplification module (30), the comparison module (40), and the control module (50) corresponding to the switch device (10) cooperate to reduce the current value of the current signal when the current value of the current signal is greater than a preset current threshold.

2. The switching device parallel current sharing circuit of claim 1, wherein, The amplification module (30) comprises a first operational amplifier (U1), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), and a sixth resistor (R6); The first end of the first resistor (R1) is electrically connected with the first end of the sampling resistor (20) corresponding to the amplification module (30), and the second end of the first resistor (R1) is electrically connected with the inverting input end of the first operational amplifier (U1); The first end of the second resistor (R2) is electrically connected with the second end of the sampling resistor (20) corresponding to the amplification module (30), and the second end of the second resistor (R2) is electrically connected with the non-inverting input end of the first operational amplifier (U1); The first end of the third resistor (R3) is electrically connected with the inverting input end of the first operational amplifier (U1), and the second end of the third resistor (R3) is electrically connected with the first end of the fourth resistor (R4); The second end of the fourth resistor (R4) is electrically connected with the output end of the first operational amplifier (U1); The first end of the fifth resistor (R5) is electrically connected with the non-inverting input end of the first operational amplifier (U1), and the second end of the fifth resistor (R5) is electrically connected with the first end of the sixth resistor (R6); The second end of the sixth resistor (R6) is grounded; The output end of the first operational amplifier (U1) is electrically connected with the first input end of the comparison module (40) corresponding to the amplification module (30).

3. The switching device parallel current sharing circuit of claim 1, wherein, The comparison module (40) comprises a second operational amplifier (U2), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), and a first diode (D1); The first end of the seventh resistor (R7) is electrically connected with the output end of the amplification module (30) corresponding to the comparison module (40), and the second end of the seventh resistor (R7) is electrically connected with the non-inverting input end of the second operational amplifier (U2); The first end of the eighth resistor (R8) is used for receiving a preset reference voltage signal, and the second end of the eighth resistor (R8) is electrically connected with the non-inverting input end of the second operational amplifier (U2); The first end of the ninth resistor (R9) is electrically connected with the inverting input end of the second operational amplifier (U2), and the second end of the ninth resistor (R9) is grounded; The output end of the second operational amplifier (U2) is electrically connected with the negative electrode of the first diode (D1); The positive electrode of the first diode (D1) is electrically connected with the first end of the tenth resistor (R10); The second end of the tenth resistor (R10) is electrically connected with the first input end of the control module (50) corresponding to the comparison module (40).

4. The switching device parallel current sharing circuit of claim 3, wherein, The comparison module (40) further comprises a first capacitor (C1), a second capacitor (C2) and an eleventh resistor (R11); The first end of the first capacitor (C1) is electrically connected with the output end of the second operational amplifier (U2), and the second end of the first capacitor (C1) is electrically connected with the first end of the tenth resistor (R10); The first end of the eleventh resistor (R11) is electrically connected with the output end of the second operational amplifier (U2), the second end of the eleventh resistor (R11) is electrically connected with the first end of the second capacitor (C2), and the second end of the second capacitor (C2) is electrically connected with the inverting input end of the second operational amplifier (U2).

5. The switching device parallel current sharing circuit of claim 1, wherein, The control module (50) comprises a third operational amplifier (U3), a fourth operational amplifier (U4), a twelfth resistor (R12), a thirteenth resistor (R13), a fourteenth resistor (R14) and a fifteenth resistor (R15); The first end of the twelfth resistor (R12) is used for receiving a preset control signal, and the second end of the twelfth resistor (R12) is electrically connected with the non-inverting input end of the third operational amplifier (U3); The inverting input end of the third operational amplifier (U3) is electrically connected with the output end of the third operational amplifier (U3), and the output end of the third operational amplifier (U3) is electrically connected with the first end of the thirteenth resistor (R13); The second end of the thirteenth resistor (R13) is electrically connected with the output end of the comparison module (40) corresponding to the control module (50) and the non-inverting input end of the fourth operational amplifier (U4) respectively; The inverting input end of the fourth operational amplifier (U4) is electrically connected with the output end of the fourth operational amplifier (U4), and the output end of the fourth operational amplifier (U4) is electrically connected with the first end of the fourteenth resistor (R14); The second end of the fourteenth resistor (R14) is electrically connected with the first end of the fifteenth resistor (R15); The second end of the fifteenth resistor (R15) is electrically connected with the control end of the switching device (10) corresponding to the control module (50).

6. The switching device parallel current sharing circuit of claim 5, wherein, The control module (50) further comprises a second diode (D2), a third capacitor (C3); The positive electrode of the second diode (D2) is electrically connected with the first end of the fifteenth resistor (R15), and the negative electrode of the second diode (D2) is electrically connected with the output end of the fourth operational amplifier (U4); The first end of the third capacitor (C3) is electrically connected with the output end of the fourth operational amplifier (U4), and the second end of the third capacitor (C3) is electrically connected with the first end of the fifteenth resistor (R15).

7. The switching device parallel current sharing circuit of claim 1, wherein, The first end of the switch device (10) is electrically connected with the input end (11) of the switch device parallel current sharing circuit, the second end of the switch device (10) is electrically connected with the first end of the sampling resistor (20) corresponding to the switch device (10), and the control end of the switch device (10) is electrically connected with the output end of the control module (50) corresponding to the switch device (10). The first end of the sampling resistor (20) corresponding to the switch device (10) is electrically connected with the first input end of the amplification module (30) corresponding to the switch device (10), and the second end of the sampling resistor (20) corresponding to the switch device (10) is respectively electrically connected with the output end (12) of the switch device parallel current sharing circuit and the second input end of the amplification module (30) corresponding to the switch device (10).

8. The switching device parallel current sharing circuit of claim 1, wherein, The input end (11) of the switch device parallel current sharing circuit is used for being electrically connected with the positive electrode of the first power supply, and the output end (12) of the switch device parallel current sharing circuit is used for being electrically connected with the negative electrode of the first power supply. Or: The input end (11) of the switch device parallel current sharing circuit is used for being electrically connected with the positive electrode of the second power supply for charging the first power supply, and the output end (12) of the switch device parallel current sharing circuit is used for being electrically connected with the positive electrode of the first power supply, wherein the negative electrode of the first power supply is electrically connected with the negative electrode of the second power supply.

9. The switching device parallel current sharing circuit of claim 1, wherein, The switch device (10) is a MOS tube.

10. A battery, characterized by The switch device parallel current sharing circuit comprises the switch device parallel current sharing circuit according to any one of claims 1 to 9.

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