Signal combination circuit and current sense amplifier circuit

Abstract

The application discloses a signal combination circuit and a current induction amplification circuit. The signal combination circuit is used for generating a combined signal of a first signal and a second signal. The signal combination circuit comprises a first switch branch, a second switch branch, a third switch branch, a first energy storage branch, a second energy storage branch, a third energy storage branch, a first operational amplifier and a controller. The controller is used for controlling the first switch branch to be turned on, and controlling the second switch branch and the third switch branch to be turned off, so as to store the first signal on the first energy storage branch. The second switch branch is controlled to be turned on, and the first switch branch and the third switch branch are controlled to be turned off, so as to store the second signal on the second energy storage branch. The third switch branch is controlled to be turned on, and the first switch branch and the second switch branch are controlled to be turned off, so as to store the first signal and the second signal to the third energy storage branch, so as to generate the combined signal. In the above manner, the purpose of reducing transient peak can be achieved.

Description

Technical Field

[0001] This application relates to the field of current sensing technology, and in particular to a signal combination circuit and a current sensing amplifier circuit. Background Technology

[0002] Switching regulators and other current-sensing applications typically require the use of current-sensing amplifiers (CSAs). In low-side current sensing, the sensing resistor is placed in the ground return path, and the CSA senses the voltage across the sensing resistor.

[0003] For CSA (Continuous Amplifier Array), the amplifier in the CSA has an offset, so this offset needs to be eliminated in applications using CSA. Currently, the commonly used elimination method is chopping, which involves inverting the polarity of the amplifier output signal to obtain two output signals, and subtracting the two output signals to obtain the final output signal, thereby achieving the purpose of eliminating the offset.

[0004] However, for the above methods, CSA still exhibits significant transient spikes. Summary of the Invention

[0005] This application aims to provide a signal combination circuit and a current sensing amplifier circuit that can reduce transient spikes.

[0006] To achieve the above objectives, in a first aspect, this application provides a signal combining circuit for generating a combined signal of a first signal and a second signal, the signal combining circuit comprising: First switch branch, second switch branch, third switch branch, first energy storage branch, second energy storage branch, third energy storage branch, first operational amplifier and controller; The first switch branch is used to input a first signal, and the first switch branch is connected to the third energy storage branch in sequence through the first energy storage branch and the third switch branch. The second switch branch is used to input a second signal, and the second switch branch is connected to the third energy storage branch in sequence through the second energy storage branch and the third switch branch. The third energy storage branch is also connected to the first operational amplifier. The controller is connected to the first switch branch, the second switch branch and the third switch branch respectively. The controller is used to: control the first switch branch to be turned on, and control the second switch branch and the third switch branch to be turned off, so as to store the first signal on the first energy storage branch; Control the second switch branch to be turned on, and control the first switch branch and the third switch branch to be turned off, so as to store the second signal in the second energy storage branch; The third switch branch is controlled to be turned on, and the first switch branch and the second switch branch are controlled to be turned off, so as to store the first signal on the first energy storage branch and the second signal on the second energy storage branch into the third energy storage branch to generate the combined signal, and the combined signal is output through the first operational amplifier.

[0007] In one alternative embodiment, the signal combination circuit further includes a fourth switching branch, a fifth switching branch, a sixth switching branch, a fourth energy storage branch, and a fifth energy storage branch. The fourth switch branch is used to input a first signal, and the fourth switch branch is connected to the third energy storage branch in sequence through the fourth energy storage branch and the sixth switch branch. The fifth switch branch is used to input a second signal, and the fifth switch branch is connected to the third energy storage branch in sequence through the fifth energy storage branch and the sixth switch branch. The controller is connected to the fourth switch branch, the fifth switch branch and the sixth switch branch respectively. The controller is also configured to: control the fourth switch branch to be turned on, and control the fifth switch branch and the sixth switch branch to be turned off, so as to store the first signal on the fourth energy storage branch; The fifth switch branch is turned on, and the fourth and sixth switch branches are turned off, so as to store the second signal in the fifth energy storage branch. The sixth switch branch is controlled to be turned on, and the fourth and fifth switch branches are controlled to be turned off, so as to store the first signal on the fourth energy storage branch and the second signal on the fifth energy storage branch into the third energy storage branch to generate the combined signal, and the combined signal is output through the first operational amplifier.

[0008] In an alternative embodiment, the controller is further configured to: When the third switch branch is turned on, the fourth switch branch is turned on, and the fifth switch branch and the sixth switch branch are turned off, so as to store the first signal on the fourth energy storage branch. When the sixth switch branch is turned on, the first switch branch is turned on, and the second switch branch and the third switch branch are turned off, so as to store the first signal on the first energy storage branch.

[0009] In an alternative embodiment, the controller is further configured to: The output of the first control signal controls the switches in the first switch branch and the first part of the switches in the sixth switch branch. The period of the first control signal is twice the period of the first reference pulse signal, and the pulse of the first control signal corresponds to half of the pulse of the first reference pulse signal. The output of the second control signal controls the switch in the second switch branch. The period of the second control signal is twice the period of the second reference pulse signal, and the pulse of the second control signal corresponds to half of the pulse of the second reference pulse signal. The third control signal is output to control the switches in the fourth switch branch and the first part of the switches in the third switch branch. The period of the third control signal is twice the period of the first reference pulse signal. The pulse of the third control signal corresponds to half of the pulse of the first reference pulse signal. The pulse of the third control signal is different from that of the first control signal. The fourth control signal is output to control the second part of the switch in the third switch branch. The period of the fourth control signal is twice the period of the third reference pulse signal, and the pulse of the fourth control signal corresponds to half of the pulse of the third reference pulse signal. The fifth control signal is output to control the switch in the fifth switch branch. The period of the fifth control signal is twice the period of the second reference pulse signal. The pulse of the fifth control signal corresponds to half a pulse of the second reference pulse signal. The pulse of the fifth control signal is different from that of the second control signal. The output of the sixth control signal controls the second part of the switch in the sixth switch branch. The period of the sixth control signal is twice the period of the third reference pulse signal. The pulse of the sixth control signal corresponds to half of the pulse of the third reference pulse signal. The sixth control signal is different from the fourth control signal. The second reference pulse signal and the third reference pulse signal are obtained by delaying the first pulse reference signal by a first duration and a second duration, respectively. The duration of one cycle in the first reference pulse signal is greater than the first duration, which is greater than the duration of one pulse in the first reference pulse signal, which is greater than the second duration.

[0010] In one alternative embodiment, the first switch branch includes a first switch and a second switch, the second switch branch includes a third switch and a fourth switch, and the third switch branch includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch. The first terminal of the first switch is used to input the first signal. The second terminal of the first switch is connected to the first terminal of the first energy storage branch and the first terminal of the fifth switch. The second terminal of the fifth switch is connected to the second terminal of the seventh switch, the first terminal of the third energy storage branch, and the output terminal of the first operational amplifier. The first terminal of the second switch, the first terminal of the fourth switch, and the second input terminal of the first operational amplifier are all grounded. The second terminal of the second switch is connected to the second terminal of the first energy storage branch and the first terminal of the sixth switch. The second terminal of the sixth switch is connected to the second terminal of the eighth switch, the second terminal of the third energy storage branch, and the first input terminal of the first operational amplifier. The first terminal of the third switch is used to input the second signal. The second terminal of the third switch is connected to the first terminal of the second energy storage branch and the first terminal of the seventh switch. The second terminal of the fourth switch is connected to the second terminal of the second energy storage branch and the first terminal of the eighth switch. The first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch are all connected to the controller.

[0011] In one alternative embodiment, the fourth switch branch includes the ninth and tenth switches, the fifth switch branch includes the eleventh and twelfth switches, and the sixth switch branch includes the thirteenth, fourteenth, fifteenth, and sixteenth switches. The first terminal of the ninth switch is used to input the first signal. The second terminal of the ninth switch is connected to the first terminal of the fourth energy storage branch and the first terminal of the thirteenth switch. The second terminal of the thirteenth switch is connected to the second terminal of the fifteenth switch, the first terminal of the third energy storage branch, and the output terminal of the first operational amplifier. The first terminals of the tenth switch and the twelfth switch are both grounded. The second terminal of the tenth switch is connected to the second terminal of the fourth energy storage branch and the first terminal of the fourteenth switch. The second terminal of the fourteenth switch is connected to the second terminal of the sixteenth switch, the second terminal of the third energy storage branch, and the first input terminal of the first operational amplifier. The first terminal of the eleventh switch is used to input the second signal. The second terminal of the eleventh switch is connected to the first terminal of the fifth energy storage branch and the first terminal of the fifteenth switch. The second terminal of the twelfth switch is connected to the second terminal of the fifth energy storage branch and the first terminal of the sixteenth switch. The ninth switch, the tenth switch, the eleventh switch, the twelfth switch, the thirteenth switch, the fourteenth switch, the fifteenth switch, and the sixteenth switch are all connected to the controller.

[0012] In one alternative embodiment, the first switch, the third switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch, the eleventh switch, the thirteenth switch, the fourteenth switch, the fifteenth switch, and the sixteenth switch each include three sub-switches; The three sub-switches include a first sub-switch, a second sub-switch, and a third sub-switch. The first sub-switch and the second sub-switch are connected in series. The connection point between the first sub-switch and the second sub-switch is connected to the first end of the third sub-switch. The second end of the third sub-switch is grounded. Wherein, the first end of the circuit formed by the first sub-switch and the second sub-switch connected in series is the first end of the corresponding switch, and the second end of the circuit formed by the first sub-switch and the second sub-switch connected in series is the second end of the corresponding switch.

[0013] In one alternative embodiment, the first energy storage branch includes a first capacitor, the second energy storage branch includes a second capacitor, the third energy storage branch includes a third capacitor, the fourth energy storage branch includes a fourth capacitor, and the fifth energy storage branch includes a fifth capacitor. The two ends of the first capacitor are the two ends of the first energy storage branch, the two ends of the second capacitor are the two ends of the second energy storage branch, the two ends of the third capacitor are the two ends of the third energy storage branch, the two ends of the fourth capacitor are the two ends of the fourth energy storage branch, and the two ends of the fifth capacitor are the two ends of the fifth energy storage branch.

[0014] Secondly, this application provides a current sensing amplifier circuit for connecting to a first terminal of a sensing resistor, the second terminal of which is grounded, and the sensing resistor is used to generate a sensing signal based on the induced current. The current sensing amplifier circuit includes a signal input terminal, a first switching branch, a second switching branch, a second operational amplifier, and a signal combination circuit as described in the first aspect. The second operational amplifier is connected between the first switching branch and the second switching branch. The first switching branch is connected to the signal input terminal. The first end of the signal input terminal is used to input a third signal. The second end of the signal input terminal is connected to the first end of the sensing resistor to input the sensing signal. The output terminal of the second operational amplifier is connected to the signal combination circuit through the second switching branch to output a first signal or a second signal to the signal combination circuit. The controller in the signal combination circuit is connected to the first switching branch and the second switching branch respectively. The controller is used to: control the first switching branch to switch the connection relationship between the input terminal of the second operational amplifier and the signal input terminal; Control the second switching branch to switch the connection between the output of the second operational amplifier and the signal combination circuit.

[0015] In an alternative embodiment, the controller is further configured to: Control the first switching branch to switch the connection of the first terminal of the input terminal of the second operational amplifier to the first terminal of the signal input terminal, and the connection of the second terminal of the input terminal of the second operational amplifier to the second terminal of the signal input terminal; and control the second switching branch to switch the connection of the first terminal of the output terminal of the second operational amplifier to the signal combination circuit. Alternatively, the first switching branch can be controlled to switch the connection between the second terminal of the input of the second operational amplifier and the first terminal of the signal input, and the first terminal of the input of the second operational amplifier and the second terminal of the signal input, and the second switching branch can be controlled to switch the connection between the second terminal of the output of the second operational amplifier and the signal combination circuit.

[0016] In an alternative embodiment, the controller is further configured to: At the moment when the first switching branch and the second switching branch perform a switching operation, control the first switching branch, the second switching branch, the fourth switching branch or the fifth switching branch in the signal combination circuit to be turned on. The first switch branch, the second switch branch, the fourth switch branch, and the fifth switch branch are sequentially connected.

[0017] The beneficial effects of this application are as follows: The signal combination circuit provided in this application is used to generate a combined signal of a first signal and a second signal. The signal combination circuit includes a first switch branch, a second switch branch, a third switch branch, a first energy storage branch, a second energy storage branch, a third energy storage branch, a first operational amplifier, and a controller. The first switch branch is used to input the first signal, and the first switch branch is connected to the third energy storage branch in sequence through the first energy storage branch and the third switch branch. The second switch branch is used to input the second signal, and the second switch branch is connected to the third energy storage branch in sequence through the second energy storage branch and the third switch branch. The third energy storage branch is also connected to the first operational amplifier. The controller is connected to the first switch branch, the second switch branch, and the third switch branch respectively. The controller is used to: control the first switch branch to be turned on and control the second and third switch branches to be turned off, so as to store the first signal on the first energy storage branch; control the second switch branch to be turned on and control the first and third switch branches to be turned off, so as to store the second signal on the second energy storage branch. The third switching branch is turned on, while the first and second switching branches are turned off. This stores the first signal from the first energy storage branch and the second signal from the second energy storage branch into the third energy storage branch, generating a combined signal. This combined signal is then output through the first operational amplifier. In this way, the charge in the first and second energy storage branches can be simultaneously transferred to the third energy storage branch and output through the output terminal of the first operational amplifier. Due to the simultaneity of the transmission, transient spikes can be significantly reduced. Attached Figure Description

[0018] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0019] Figure 1 This is a schematic diagram of the structure of a signal combination circuit provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a signal combination circuit provided in an embodiment of this application; Figure 3 A schematic diagram of the reference pulse signals and control signals provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a signal combination circuit provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a first switch provided in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of a current sensing amplifier circuit provided in an embodiment of this application; Figure 7This is a schematic diagram of the circuit structure of a current sensing amplifier circuit provided in an embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the signal combination circuit provided in an embodiment of this application. Figure 1 As shown, the signal combination circuit 100 is used to generate a combined signal S12 of the first signal S1 and the second signal S2. The signal combination circuit 100 includes a first switch branch 10, a second switch branch 12, a third switch branch 14, a first energy storage branch 16, a second energy storage branch 18, a third energy storage branch 20, a first operational amplifier 22, and a controller 24.

[0022] The first switch branch 10 is used to input the first signal S1, and the first switch branch 10 is connected to the third energy storage branch 20 in sequence through the first energy storage branch 16 and the third switch branch 14. The second switch branch 12 is used to input the second signal S2, and the second switch branch 12 is connected to the third energy storage branch 20 in sequence through the second energy storage branch 18 and the third switch branch 14. The third energy storage branch 20 is also connected to the first operational amplifier 22. The controller 24 is connected to the first switch branch 10, the second switch branch 12 and the third switch branch 14 respectively.

[0023] Specifically, controller 24 is used to: control the first switch branch 10 to be turned on and control the second switch branch 12 and the third switch branch 14 to be turned off, so as to store the first signal S1 on the first energy storage branch 16; control the second switch branch 12 to be turned on and control the first switch branch 10 and the third switch branch 14 to be turned off, so as to store the second signal S2 on the second energy storage branch 18; control the third switch branch 14 to be turned on and control the first switch branch 10 and the second switch branch 12 to be turned off, so as to store the first signal S1 on the first energy storage branch 16 and the second signal S2 on the second energy storage branch 18 into the third energy storage branch 20, so as to generate a combined signal S12, and output the combined signal S12 through the first operational amplifier 22. In this way, the charge on the first energy storage branch 16 and the second energy storage branch 18 can be transferred simultaneously to the third energy storage branch 20 and output through the output terminal of the first operational amplifier 22. At the same time, due to the simultaneity of signal transmission, transient spikes can be reduced to a great extent.

[0024] In one embodiment, such as Figure 2 As shown, the signal combination circuit 100 also includes a fourth switch branch 34, a fifth switch branch 26, a sixth switch branch 28, a fourth energy storage branch 30, and a fifth energy storage branch 32.

[0025] The fourth switch branch 34 is used to input the first signal S1. The fourth switch branch 34 is connected to the third energy storage branch 20 in sequence through the fourth energy storage branch 30 and the sixth switch branch 28. The fifth switch branch 26 is used to input the second signal S2. The fifth switch branch 26 is connected to the third energy storage branch 20 in sequence through the fifth energy storage branch 32 and the sixth switch branch 28. The controller 24 is connected to the fourth switch branch 34, the fifth switch branch 26 and the sixth switch branch 28 respectively.

[0026] Specifically, the controller 24 is also used to: control the fourth switch branch 34 to be turned on, and control the fifth switch branch 26 and the sixth switch branch 28 to be turned off, so as to store the first signal S1 on the fourth energy storage branch 30; control the fifth switch branch 26 to be turned on, and control the fourth switch branch 34 and the sixth switch branch 28 to be turned off, so as to store the second signal S2 on the fifth energy storage branch 32; control the sixth switch branch 28 to be turned on, and control the fourth switch branch 34 and the fifth switch branch 26 to be turned off, so as to store the first signal S1 on the fourth energy storage branch 30 and the second signal S2 on the fifth energy storage branch 32 into the third energy storage branch 20 to generate a combined signal S12, and output the combined signal S12 through the first operational amplifier 22.

[0027] In one embodiment, the controller is further configured to: control the fourth switch branch 34 to be turned on when the third switch branch 14 is turned on, and control the fifth switch branch 26 and the sixth switch branch 28 to be turned off, so as to store the first signal S1 on the fourth energy storage branch 30; and control the first switch branch 10 to be turned on when the sixth switch branch 28 is turned on, and control the second switch branch 12 and the third switch branch 14 to be turned off, so as to store the first signal S1 on the first energy storage branch 16.

[0028] Specifically, controller 24 first controls the first switch branch 10 to be turned on and controls the second switch branch 12 and the third switch branch 14 to be turned off, so as to store the first signal S1 on the first energy storage branch 16. Then, it controls the second switch branch 12 to be turned on and controls the first switch branch 10 and the third switch branch 14 to be turned off, so as to store the second signal S2 on the second energy storage branch 18. Then, it controls the third switch branch 14 to be turned on and controls the first switch branch 10 and the second switch branch 12 to be turned off, so as to store the first signal S1 on the first energy storage branch 16 and the second signal S2 on the second energy storage branch 18 into the third energy storage branch 20, so as to generate a combined signal S12, and output the combined signal S12 through the first operational amplifier 22.

[0029] While controlling the third switch branch 14 to turn on, controller 24 simultaneously controls the fourth switch branch 34 to turn on and controls the fifth switch branch 26 and the sixth switch branch 28 to turn off, so as to store the first signal S1 on the fourth energy storage branch 30. Next, controller 24 controls the fifth switch branch 26 to turn on and controls the fourth switch branch 34 and the sixth switch branch 28 to turn off, so as to store the second signal S2 on the fifth energy storage branch 32; controller 24 controls the sixth switch branch 28 to turn on and controls the fourth switch branch 34 and the fifth switch branch 26 to turn off, so as to store the first signal S1 on the fourth energy storage branch 30 and the second signal S2 on the fifth energy storage branch 32 into the third energy storage branch 20, so as to generate a combined signal S12, and output the combined signal S12 through the first operational amplifier 22.

[0030] While controlling the sixth switch branch 28 to conduct, the controller 24 also controls the first switch branch 10 to conduct again, and controls the second switch branch 12 and the third switch branch 14 to turn off, so as to store the first signal S1 on the first energy storage branch 16. And repeat the above process.

[0031] exist Figure 1 In the illustrated embodiment, when the first signal S1 and the second signal S2 have different magnitudes and different durations in each cycle, the combined signal S12 output by the first operational amplifier 22 will still have a certain ripple. However, in this embodiment, by adding the fourth switch branch 34, the fifth switch branch 26, the sixth switch branch 28, the fourth energy storage branch 30, and the fifth energy storage branch 32, the combined signal S12 can be continuously superimposed through the alternating conduction of the third switch branch 14 and the sixth switch branch 28. This can eliminate the ripple caused by the different durations of the first signal S1 and the second signal S2 in each cycle, and further reduce transient spikes.

[0032] In some embodiments, the controller 24 is further configured to: output a first control signal to control the switches in the first switch branch 10 and a first portion of the switches in the sixth switch branch 28, wherein the period of the first control signal is twice the period of the first reference pulse signal, and the pulse of the first control signal corresponds to half a pulse of the first reference pulse signal; output a second control signal to control the switches in the second switch branch 12, wherein the period of the second control signal is twice the period of the second reference pulse signal, and the pulse of the second control signal corresponds to half a pulse of the second reference pulse signal; and output a third control signal to control the switches in the fourth switch branch 34 and a first portion of the switches in the third switch branch 14, wherein the period of the third control signal is twice the period of the first reference pulse signal, and the pulse of the third control signal corresponds to half a pulse of the first reference pulse signal. The pulse of the signal is different from that of the first control signal; the output fourth control signal controls the switch in the fifth switch branch 26, the period of the fourth control signal is twice the period of the second reference pulse signal, the pulse of the fourth control signal corresponds to half a pulse of the second reference pulse signal, and the pulse of the fourth control signal is different from that of the second control signal; the output fifth control signal controls the second part of the switch in the third switch branch 14, the period of the fifth control signal is twice the period of the third reference pulse signal, and the pulse of the fifth control signal corresponds to half a pulse of the third reference pulse signal; the output sixth control signal controls the second part of the switch in the sixth switch branch 28, the period of the sixth control signal is twice the period of the third reference pulse signal, the pulse of the sixth control signal corresponds to half a pulse of the third reference pulse signal, and the sixth control signal is different from that of the fifth control signal.

[0033] The second reference pulse signal and the third reference pulse signal are obtained by delaying the first pulse reference signal by a first duration and a second duration, respectively. The duration of one cycle in the first reference pulse signal is greater than the first duration, which is greater than the duration of one pulse in the first reference pulse signal, which is greater than the second duration.

[0034] Please refer to Figure 3 , Figure 3 The diagram illustrates, for example, the various reference pulse signals and control signals. Figure 3 As shown, the horizontal axis represents time. Curve SA1 is the first reference pulse signal; curve SA2 is the second reference pulse signal; curve SA3 is the third reference pulse signal; curve SB1 is the first control signal; curve SB2 is the second control signal; curve SB3 is the third control signal; curve SB4 is the fourth control signal; curve SB5 is the fifth control signal; and curve SB6 is the sixth control signal.

[0035] like Figure 3As shown, the duration from time T1 to time T7 is one period of the first reference pulse signal SA1, and the duration from time T1 to time T13 is one period of the first control signal SB1. The duration from time T1 to time T13 includes two periods of the first reference pulse signal SA1: the first period corresponding to the duration from time T1 to time T7 and the second period corresponding to the duration from time T7 to time T13. Therefore, the period of the first control signal SB1 is twice the period of the first reference pulse signal SA1. The pulses of the first reference pulse signal SA1 are Ta1, Ta2, Ta3…, and the pulses of the first control signal SB1 are Td1, Td2…. The pulses corresponding to the first control signal SB1 and the first reference voltage signal SA1 refer to the pulses in the first control signal SB1 and the first reference voltage signal SA1 whose start and stop times are the same; for example, pulse Ta1 corresponds to pulse Td1, and pulse Ta3 corresponds to pulse Td2.

[0036] The duration between time T5 and time T17 is one cycle of the second control signal SB2. The time interval between T5 and T17 includes two cycles of the second reference pulse signal SA2: the first cycle corresponding to the duration between T5 and T11, and the second cycle corresponding to the duration between T11 and T17. Therefore, the period of the second control signal SB2 is twice the period of the second reference pulse signal SA2. The pulses of the second reference pulse signal SA2 are Tb1, Tb2, Tb3…, and the pulses of the second control signal SB2 are Te1, Te2…. The pulses corresponding to the second control signal SB2 and the second reference voltage signal SA2 refer to the pulses in the second control signal SB2 and the second reference voltage signal SA2 whose start and stop times are the same; for example, pulse Tb1 corresponds to pulse Te1, and pulse Tb3 corresponds to pulse Te2.

[0037] The duration between time T7 and time T19 is one cycle of the third control signal SB3. The time interval between T7 and T19 includes two cycles of the first reference pulse signal SA1: the first cycle corresponding to the duration between T7 and T13, and the second cycle corresponding to the duration between T13 and T19. Therefore, the period of the third control signal SB3 is twice the period of the first reference pulse signal SA1. The pulses of the first reference pulse signal SA1 are Ta1, Ta2, Ta3…, and the pulses of the third control signal SB3 are Tf1, Tf2…. The pulses corresponding to the third control signal SB3 and the first reference voltage signal SA1 refer to the pulses in the third control signal SB3 and the first reference voltage signal SA1 whose start and stop times are the same; for example, Ta2 corresponds to Tf1, and Ta4 corresponds to Tf2. Furthermore, the pulses of the third control signal SB3 and the pulses of the first control signal SB1 do not appear simultaneously, and the combination of the third control signal SB3 and the first control signal SB1 constitutes the first reference voltage signal SA1.

[0038] The duration between time T8 and time T20 is one cycle of the fourth control signal SB4. The time interval between T8 and T20 includes two cycles of the third reference pulse signal SA3: the first cycle corresponding to the duration between T8 and T14, and the second cycle corresponding to the duration between T14 and T20. Therefore, the period of the fourth control signal SB4 is twice the period of the third reference pulse signal SA3. The pulses of the third reference pulse signal SA3 are Tc1, Tc2, Tc3…, and the pulses of the fourth control signal SB4 are Tg1, Tg2…. The pulses corresponding to the fourth control signal SB4 and the third reference voltage signal SA3 refer to the pulses in the fourth control signal SB4 and the third reference voltage signal SA3 whose start and stop times are the same; for example, pulse Tc1 corresponds to pulse Tg1, and pulse Tc3 corresponds to pulse Tg2.

[0039] The duration from time T11 to time T232 is one cycle of the fifth control signal SB5. The time interval between T11 and T23 includes two cycles of the second reference pulse signal SA2: the first cycle corresponding to the duration between T11 and T17, and the second cycle corresponding to the duration between T17 and T23. Therefore, the period of the fifth control signal SB5 is twice the period of the second reference pulse signal SA2. The pulses of the second reference pulse signal SA2 are Tb1, Tb2, Tb3…, and the pulses of the fifth control signal SB5 are Th1, Th2…. The pulses corresponding to the fifth control signal SB5 and the second reference voltage signal SA2 refer to the pulses in the fifth control signal SB5 and the second reference voltage signal SA2 whose start and stop times are the same; for example, Tb2 corresponds to Th1, and Tb4 corresponds to Th2. Furthermore, the pulses of the fifth control signal SB5 and the second control signal SB2 do not appear simultaneously, and the combination of the fifth control signal SB5 and the second control signal SB2 constitutes the second reference voltage signal SA3.

[0040] The duration between time T2 and time T14 is one cycle of the sixth control signal SB6. The time interval between T2 and T14 includes two cycles of the third reference pulse signal SA3: the first cycle corresponding to the duration between T2 and T8, and the second cycle corresponding to the duration between T8 and T14. Therefore, the period of the sixth control signal SB6 is twice the period of the third reference pulse signal SA3. The pulses of the third reference pulse signal SA3 are Tc1, Tc2, Tc3…, and the pulses of the sixth control signal SB6 are Ti1, Ti2…. The pulses corresponding to the sixth control signal SB6 and the third reference voltage signal SA3 refer to the pulses in the sixth control signal SB6 and the third reference voltage signal SA3 whose start and stop times are the same; for example, pulse Tc1 corresponds to pulse Ti1, and pulse Tc3 corresponds to pulse Ti2.

[0041] Specifically, the duration between time T1 and time T5 is a delay between the first pulse reference signal SA1 and the second pulse reference signal SA2, which is the first duration. The duration between time T1 and time T2 is a delay between the first pulse reference signal SA1 and the third pulse reference signal SA3, which is the second duration. The duration between time T1 and time T3 is the duration of one pulse of the first reference pulse signal SA1. The duration between time T1 and time T7 is the duration of one cycle of the first reference pulse signal SA1. Obviously, the duration of one cycle of the first reference pulse signal SA1 > the first duration > the duration of one pulse of the first reference pulse signal SA1 > the second duration.

[0042] In this embodiment, it is assumed that the signal combination circuit starts operating from time T1, at which point the pulse Td1 of the first control signal SB1 is applied. The switches in the first switch branch 10 are driven to conduct, storing the first signal S1 in the first energy storage branch 16. Simultaneously, the first portion of the switches in the sixth switch branch 28 are also driven to conduct.

[0043] After the delay between time T1 and time T2, at pulse Ti1 of the sixth control signal SB6, the second part of the switch in the sixth switch branch 28 is driven to conduct, so that the first signal S1 and the second signal S2 are simultaneously stored in the third energy storage branch 20. A combined signal S12 is generated, and then the combined signal S12 is output through the first operational amplifier 22.

[0044] After the delay between time T3 and time T5, at pulse Te1 of the second control signal SB2, each switch in the second switch branch 12 is driven to conduct, so as to store the second signal S2 in the second energy storage branch 18.

[0045] After the delay between time T6 and time T7, at pulse Tf1 of the third control signal SB3, the first part of the switches in the third switch branch 14 is driven to conduct. At the same time, all switches in the fourth switch branch 34 are also driven to conduct, so as to store the first signal in the fourth energy storage branch 30.

[0046] After the delay between time T7 and time T8, at pulse Tg1 of the fourth control signal SB4, the second part of the switch in the third switch branch 14 is driven to conduct, so that the first signal S1 and the second signal S2 are simultaneously stored in the third energy storage branch 20. A combined signal S12 is generated, and then the combined signal S12 is output through the first operational amplifier 22.

[0047] After the delay between time T10 and time T11, at pulse Th1 of the fifth control signal SB5, each switch in the fifth switch branch 26 is driven to conduct, so as to store the second signal S2 in the fifth energy storage branch 32.

[0048] After the delay between time T12 and time T13, the system is once again in the pulse Td2 of the first control signal SB1. All switches in the first switch branch 10 are activated to store the first signal S1 in the first energy storage branch 16. Simultaneously, the first portion of switches in the sixth switch branch 28 are also activated.

[0049] By continuously repeating the above process, the combined signal S12 of the first signal S1 and the second signal S2 is generated. In this process, the charge on the first energy storage branch 16 and the second energy storage branch 18 can be transferred to the third energy storage branch 20 almost simultaneously. As a result, due to the simultaneity of signal transmission, transient spikes can be reduced to a large extent.

[0050] It should be noted that in this embodiment, all switches except the one that is driven to be turned on are turned off. For example, when the pulse Te1 of the second control signal SB2 is activated, all switches in the second switch branch 12 are turned on, while all other switches (such as the switches in the first switch branch 10) are turned off.

[0051] Please refer to Figure 4 , Figure 4 An exemplary structure of a signal combination circuit 100 is shown in the figure.

[0052] In one embodiment, such as Figure 4 As shown, the first switch branch 10 includes a first switch K1 and a second switch K2, the second switch branch 12 includes a third switch K3 and a fourth switch K4, and the third switch branch 14 includes a fifth switch K5, a sixth switch K6, a seventh switch K7, and an eighth switch K8.

[0053] Wherein, the first terminal of the first switch K1 is used to input the first signal S1, the second terminal of the first switch K1 is connected to the first terminal of the first energy storage branch 16 and the first terminal of the fifth switch K5, the second terminal of the fifth switch K5 is connected to the second terminal of the seventh switch K7, the first terminal of the third energy storage branch 20 and the output terminal of the first operational amplifier 22, the first terminal of the second switch K2, the first terminal of the fourth switch K4 and the second input terminal of the first operational amplifier 22 are all grounded to GND, the second terminal of the second switch K2 is connected to the second terminal of the first energy storage branch 16 and the first terminal of the sixth switch K6, the second terminal of the sixth switch K6 is connected to the second terminal of the eighth switch K8, the second terminal of the third energy storage branch 20 and the first input terminal of the first operational amplifier 22, the first terminal of the third switch K3 is used to input the second signal S2, the second terminal of the third switch K3 is connected to the first terminal of the second energy storage branch 18 and the first terminal of the seventh switch K7, and the second terminal of the fourth switch K4 is connected to the second terminal of the second energy storage branch 18 and the first terminal of the eighth switch K8.

[0054] The first switch K1, the second switch K2, the third switch K3, the fourth switch K4, the fifth switch K5, the sixth switch K6, the seventh switch K7, and the eighth switch K8 are also connected to the controller 24.

[0055] In another embodiment, the fourth switch branch 34 includes the ninth switch K9 and the tenth switch K10, the fifth switch branch 26 includes the eleventh switch K11 and the twelfth switch K12, and the sixth switch branch 28 includes the thirteenth switch K13, the fourteenth switch K14, the fifteenth switch K15, and the sixteenth switch K16.

[0056] Specifically, the first terminal of the ninth switch K9 is used to input the first signal S1. The second terminal of the ninth switch K9 is connected to the first terminal of the fourth energy storage branch 30 and the first terminal of the thirteenth switch K13. The second terminal of the thirteenth switch K13 is connected to the second terminal of the fifteenth switch K15, the first terminal of the third energy storage branch 20, and the output terminal of the first operational amplifier 22. The first terminals of the tenth switch K10 and the twelfth switch K12 are both grounded to GND. The second terminal of the tenth switch K10 is connected to the second terminal of the fourth energy storage branch 30 and the first terminal of the fourteenth switch K14. The second terminal of the fourteenth switch K14 is connected to the second terminal of the sixteenth switch K16, the second terminal of the third energy storage branch 20, and the first input terminal of the first operational amplifier 22. The first terminal of the eleventh switch K11 is used to input the second signal S2. The second terminal of the eleventh switch K11 is connected to the first terminal of the fifth energy storage branch 32 and the first terminal of the fifteenth switch K15. The second terminal of the twelfth switch K12 is connected to the second terminal of the fifth energy storage branch 32 and the first terminal of the sixteenth switch K16.

[0057] The ninth switch K9, the tenth switch K10, the eleventh switch K11, the twelfth switch K12, the thirteenth switch K13, the fourteenth switch K14, the fifteenth switch K15, and the sixteenth switch K16 are also connected to the controller 24.

[0058] Specifically, the first switch K1, the second switch K2, the fourteenth switch K14, and the sixteenth switch K16 are all controlled by the first control signal, wherein the fourteenth switch K14 and the sixteenth switch K16 constitute the first part of the switches in the sixth switch branch 28. The third switch K3 and the fourth switch K4 are controlled by the second control signal. The sixth switch K6, the eighth switch K8, the ninth switch K9, and the tenth switch K10 are controlled by the third control signal, wherein the sixth switch K6 and the eighth switch K8 constitute the first part of the switches in the third switch branch 14. The eleventh switch K11 and the twelfth switch K12 are controlled by the fourth control signal. The fifth switch K5 and the seventh switch K7 are controlled by the fifth control signal, wherein the fifth switch K5 and the seventh switch K7 constitute the second part of the switches in the third switch branch 14. The thirteenth switch K13 and the fifteenth switch K15 are controlled by the sixth control signal, wherein the thirteenth switch K13 and the fifteenth switch K15 constitute the second part of the switches in the sixth switch branch 28.

[0059] In one embodiment, the first switch K1, the third switch K3, the fifth switch K5, the sixth switch K6, the seventh switch K7, the eighth switch K8, the ninth switch K9, the eleventh switch K11, the thirteenth switch K13, the fourteenth switch K14, the fifteenth switch K15, and the sixteenth switch K16 each include three sub-switches.

[0060] The system comprises three sub-switches: a first sub-switch, a second sub-switch, and a third sub-switch. The first and second sub-switches are connected in series, and the connection point between them is connected to the first terminal of the third sub-switch. The second terminal of the third sub-switch is grounded. The first terminal of the circuit formed by the series connection of the first and second sub-switches is the first terminal of the corresponding switch, and the second terminal of the circuit formed by the series connection of the first and second sub-switches is the second terminal of the corresponding switch.

[0061] Take the first switch K1 as an example. Please refer to... Figure 5 , Figure 5 The diagram illustrates one structure of the first switch K1.

[0062] like Figure 5 As shown, the first switch K1 includes a first sub-switch K111, a second sub-switch K112, and a third sub-switch K113.

[0063] In this circuit, the first sub-switch K111 and the second sub-switch K112 are connected in series. The connection point N1 between the first sub-switch K111 and the second sub-switch K112 is connected to the first terminal of the third sub-switch K113, and the second terminal of the third sub-switch K113 is grounded to GND. The first terminal of the circuit formed by the first sub-switch K111 and the second sub-switch K112 connected in series (i.e., the terminal of the first sub-switch K111 not connected to connection point N1) is the first terminal of the corresponding switch (i.e., the first switch K1), and the second terminal of the circuit formed by the first sub-switch K111 and the second sub-switch K112 connected in series (i.e., the terminal of the second sub-switch K112 not connected to connection point N1) is the second terminal of the corresponding switch (i.e., the first switch K1).

[0064] In this embodiment, when the first sub-switch K111 and the second sub-switch K112 are simultaneously turned on, and the third sub-switch K113 is turned off, the corresponding first switch K1 is turned on; when the first sub-switch K111 and the second sub-switch K112 are simultaneously turned off, and the third sub-switch K113 is turned on, the corresponding first switch K1 is turned on. Furthermore, the first sub-switch K111 and the second sub-switch K112 are controlled by the same control signal (i.e., the first control signal), while the signal controlled by the third sub-switch K113 is opposite to the first control signal. Also, when the first sub-switch K111 and the second sub-switch K112 are turned on, the third sub-switch K113 is turned off; when the first sub-switch K111 and the second sub-switch K112 are turned off, the third sub-switch K113 is turned on, in order to absorb the energy consumption that may occur when the first sub-switch K111 and the second sub-switch K112 are turned off, thereby further reducing transient spikes.

[0065] In one embodiment, please continue to refer to Figure 4 The first energy storage branch 16 includes a first capacitor C1, the second energy storage branch 18 includes a second capacitor C2, the third energy storage branch 20 includes a third capacitor C3, the fourth energy storage branch 30 includes a fourth capacitor C4, and the fifth energy storage branch 32 includes a fifth capacitor C5.

[0066] Among them, the two ends of the first capacitor C1 are the two ends of the first energy storage branch 16, the two ends of the second capacitor C2 are the two ends of the second energy storage branch 18, the two ends of the third capacitor C3 are the two ends of the third energy storage branch 20, the two ends of the fourth capacitor C4 are the two ends of the fourth energy storage branch 30, and the two ends of the fifth capacitor C5 are the two ends of the fifth energy storage branch 32.

[0067] Please refer to Figure 6 , Figure 6 This is a schematic diagram of the current sensing amplifier circuit provided in an embodiment of this application. Figure 6 As shown, the current sensing amplifier circuit 1000 is connected to the first terminal of the sensing resistor R1, and the second terminal of the sensing resistor R1 is grounded to GND. The sensing resistor R1 is used to generate an induced signal based on the induced current, and the current induced by the sensing resistor R1 is the current flowing through the sensing resistor R1.

[0068] The current sensing amplifier circuit 1000 includes a signal input terminal J1, a first switching branch 200, a second switching branch 300, a second operational amplifier 400, and a signal combination circuit 100 in any embodiment of this application.

[0069] The second operational amplifier 400 is connected between the first switching branch 200 and the second switching branch 300. The first switching branch 200 is connected to the signal input terminal J1. The first terminal J11 of the signal input terminal J1 is used to input a third signal. The second terminal of the signal input terminal J1 is connected to the first terminal of the sensing resistor R1 to input a sensing signal. The output terminal of the second operational amplifier 400 is connected to the signal combination circuit 100 through the second switching branch 300 to output a first signal or a second signal to the signal combination circuit 100. The controller 24 in the signal combination circuit 100 is connected to the first switching branch 200 and the second switching branch 300 respectively.

[0070] Specifically, controller 24 is used to: control the first switching branch 200 to switch the connection between the input terminal and the signal input terminal of the second operational amplifier 400; and control the second switching branch 300 to switch the connection between the output terminal of the second operational amplifier 400 and the signal combination circuit 100.

[0071] In related technologies, switching regulators and other current-sensing applications typically require the use of a current sensing resistor (CSA). Specifically, when using low-side current sensing, the sensing resistor is placed in the ground return path, and the CSA detects the voltage across the sensing resistor. In some practical applications, for the CSA, firstly, the output needs to be controlled to avoid significant transient spikes and to continuously and smoothly reflect the amplified input signal; secondly, since the voltage amplitude to be detected is usually very small (e.g., 1mV), it is necessary to keep the power loss of the sensing resistor low and maintain a low ground impedance. Therefore, the CSA needs to be very accurate, meaning its offset needs to be very small, for example, less than 100µV.

[0072] Currently, in related technologies, the commonly used elimination method to address the first issue is chopping. Specifically, this involves reversing the polarity of the amplifier's output signal to obtain two output signals, which are then subtracted to obtain the final output signal, thus achieving the purpose of eliminating offset. However, this method has two drawbacks: firstly, it results in one of the two output signals being negative, limiting its applicability to specific amplifiers; secondly, it still leads to noticeable transient spikes in the CSA (Continuous Asynchronous Shift). In the embodiments of this application, firstly, a first switching branch and a second switching branch are set to switch the connection relationship between the input and output terminals of the second operational amplifier 400, respectively. This ensures that both signals output by the second operational amplifier 400 are positive, making it applicable to conventional operational amplifiers and highly practical. Secondly, the first and second signals are transmitted simultaneously through the signal combination circuit 100, which can significantly reduce transient spikes.

[0073] In one embodiment, the controller 24 is further configured to: control the first switching branch 200 to switch the connection of the first terminal of the input terminal of the second operational amplifier 400 to the first terminal J11 of the signal input terminal J1, and the connection of the second terminal of the input terminal of the second operational amplifier 400 to the second terminal J12 of the signal input terminal J1; and control the second switching branch 300 to switch the connection of the first terminal of the output terminal of the second operational amplifier 400 to the signal combination circuit 100.

[0074] Alternatively, the first switching branch 200 is controlled to switch the second terminal of the input terminal of the second operational amplifier 400 to the first terminal J11 of the signal input terminal J1, and the first terminal of the input terminal of the second operational amplifier 400 to the second terminal J12 of the signal input terminal J1. The second switching branch 300 is also controlled to switch the second terminal of the output terminal of the second operational amplifier 400 to the signal combination circuit 100.

[0075] In this embodiment, differential operation is performed on the two output terminals of the second operational amplifier 400 so that only one of the two output terminals of the second operational amplifier 400 is connected to the signal combination circuit 100.

[0076] Figure 7 An exemplary structure of the first switching branch 200 is shown in the figure. Figure 7 The first switching branch 200 includes the seventeenth switch K17, the eighteenth switch K18, the nineteenth switch K19, and the twentieth switch K20. The specific connection relationship is as follows: Figure 7 As shown, details will not be repeated here. Among them, the seventeenth switch K17, the eighteenth switch K18, the nineteenth switch K19 and the twentieth switch K20 are also connected to the controller 24 (not shown in the figure).

[0077] In some embodiments, the controller 24 is further configured to: control the seventeenth switch K17 and the nineteenth switch K19 to be turned on, and control the eighteenth switch K18 and the twentieth switch K20 to be turned off, so as to switch the first terminal of the input terminal of the second operational amplifier 400 to be connected to the first terminal J11 of the signal input terminal J1, and the second terminal of the input terminal of the second operational amplifier 400 to be connected to the second terminal J12 of the signal input terminal J1; control the eighteenth switch K18 and the twentieth switch K20 to be turned on, and control the seventeenth switch K17 and the nineteenth switch K19 to be turned off, so as to switch the second terminal of the input terminal of the second operational amplifier 400 to be connected to the first terminal J11 of the signal input terminal J1, and the first terminal of the input terminal of the second operational amplifier 400 to be connected to the second terminal J12 of the signal input terminal J1.

[0078] It should be noted that the specific structure of the second operational amplifier 400 is well known in the art and will not be described in detail here. The specific implementation of the second switching branch 300 is similar to that of the first switching branch 200, and is readily understood by those skilled in the art, and will not be described in detail here.

[0079] In some embodiments, the controller 24 is further configured to: at the moment when the first switching branch 200 and the second switching branch 300 perform a switching operation, turn on the first switching branch 10, the second switching branch 12, the fourth switching branch 34, or the fifth switching branch 26 in the control signal combination circuit 100. The first switching branch 10, the second switching branch 12, the fourth switching branch 34, and the fifth switching branch 26 are turned on sequentially.

[0080] by Figure 3 Let's take an example. At time T1, controller 24 controls the first switching branch 200 to switch the connection between the first terminal of the input of the second operational amplifier 400 and the first terminal J11 of the signal input J1, and the second terminal of the input of the second operational amplifier 400 and the second terminal J12 of the signal input J1. It also controls the second switching branch 300 to switch the connection between the first terminal of the output of the second operational amplifier 400 and the signal combination circuit 100. At this time, the first terminal of the output of the second operational amplifier 400 outputs a first signal to the signal combination circuit 100, and the first control signal output by controller 24 controls the first switching branch 10 to conduct.

[0081] Next, at time T5, controller 24 controls the second switching branch 300 to switch the connection between the second input terminal of the second operational amplifier 400 and the first input terminal J11 of the signal input terminal J1, and the first input terminal of the second operational amplifier 400 and the second input terminal J12 of the signal input terminal J1. It also controls the second switching branch 300 to switch the connection between the second output terminal of the second operational amplifier 400 and the signal combination circuit 100. At this time, the second output terminal of the second operational amplifier 400 outputs a second signal to the signal combination circuit 100, and the second control signal output by controller 24 controls the second switching branch 12 to conduct.

[0082] Next, at time T7, controller 24 again controls the first switching branch 200 to switch the connection of the first terminal of the input of the second operational amplifier 400 to the first terminal J11 of the signal input J1, and the second terminal of the input of the second operational amplifier 400 to the second terminal J12 of the signal input J1. It also controls the second switching branch 300 to switch the connection of the first terminal of the output of the second operational amplifier 400 to the signal combination circuit 100. At this time, the first terminal of the output of the second operational amplifier 400 outputs a first signal to the signal combination circuit 100, and the third control signal output by controller 24 controls the fourth switching branch 34 to conduct.

[0083] Next, at time T11, the controller 24 again controls the second switching branch 300 to switch the connection between the second input terminal of the second operational amplifier 400 and the first input terminal J11 of the signal input terminal J1, and the first input terminal of the second operational amplifier 400 and the second input terminal J12 of the signal input terminal J1. It also controls the second switching branch 300 to switch the connection between the second output terminal of the second operational amplifier 400 and the signal combination circuit 100. At this time, the second output terminal of the second operational amplifier 400 outputs a second signal to the signal combination circuit 100, and the fifth control signal output by the controller 24 controls the fifth switching branch 26 to conduct.

[0084] The above process is repeated continuously. This ensures that the second operational amplifier 400 sequentially outputs the first and second signals, both of which are positive. This is applicable to conventional operational amplifiers and has strong practicality. Furthermore, it enables the simultaneous transmission of the first and second signals through the signal combination circuit 100 to output a combined signal, thereby significantly reducing transient spikes.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A signal combination circuit, characterized in that, The signal combining circuit is used to generate a combined signal of the first signal and the second signal, and includes: First to sixth switch branches, first to fifth energy storage branches, first operational amplifier and controller; The first switch branch and the fourth switch branch are used to input a first signal. The first switch branch is connected to the third energy storage branch in sequence through the first energy storage branch and the third switch branch. The second switch branch and the fifth switch branch are used to input a second signal. The second switch branch is connected to the third energy storage branch in sequence through the second energy storage branch and the third switch branch. The third energy storage branch is also connected to the first operational amplifier. The controller is connected to the first to sixth switch branches respectively. The fourth switch branch is connected to the third energy storage branch in sequence through the fourth energy storage branch and the sixth switch branch, and the fifth switch branch is connected to the third energy storage branch in sequence through the fifth energy storage branch and the sixth switch branch; The controller is used to: control the first switch branch to be turned on, and control the second switch branch and the third switch branch to be turned off, so as to store the first signal on the first energy storage branch; Control the second switch branch to be turned on, and control the first switch branch and the third switch branch to be turned off, so as to store the second signal in the second energy storage branch; The third switch branch is controlled to be turned on, and the first switch branch and the second switch branch are controlled to be turned off, so as to store the first signal on the first energy storage branch and the second signal on the second energy storage branch into the third energy storage branch to generate the combined signal, and the combined signal is output through the first operational amplifier; Control the fourth switch branch to be turned on, and control the fifth switch branch and the sixth switch branch to be turned off, so as to store the first signal in the fourth energy storage branch; The fifth switch branch is turned on, and the fourth and sixth switch branches are turned off, so as to store the second signal in the fifth energy storage branch. The sixth switch branch is turned on, and the fourth and fifth switch branches are turned off, so as to store the first signal on the fourth energy storage branch and the second signal on the fifth energy storage branch into the third energy storage branch to generate the combined signal, and output the combined signal through the first operational amplifier; When the third switch branch is turned on, the fourth switch branch is turned on, and the fifth and sixth switch branches are turned off, so as to store the first signal in the fourth energy storage branch. When the sixth switch branch is turned on, the first switch branch is turned on, and the second switch branch and the third switch branch are turned off, so as to store the first signal on the first energy storage branch.

2. The signal combination circuit according to claim 1, characterized in that, The controller is also used for: The output of the first control signal controls the switches in the first switch branch and the first part of the switches in the sixth switch branch. The period of the first control signal is twice the period of the first reference pulse signal, and the pulse of the first control signal corresponds to half of the pulse of the first reference pulse signal. The output of the second control signal controls the switch in the second switch branch. The period of the second control signal is twice the period of the second reference pulse signal, and the pulse of the second control signal corresponds to half of the pulse of the second reference pulse signal. The third control signal is output to control the switches in the fourth switch branch and the first part of the switches in the third switch branch. The period of the third control signal is twice the period of the first reference pulse signal. The pulse of the third control signal corresponds to half of the pulse of the first reference pulse signal. The pulse of the third control signal is different from that of the first control signal. The fourth control signal is output to control the second part of the switch in the third switch branch. The period of the fourth control signal is twice the period of the third reference pulse signal, and the pulse of the fourth control signal corresponds to half of the pulse of the third reference pulse signal. The fifth control signal is output to control the switch in the fifth switch branch. The period of the fifth control signal is twice the period of the second reference pulse signal. The pulse of the fifth control signal corresponds to half a pulse of the second reference pulse signal. The pulse of the fifth control signal is different from that of the second control signal. The output of the sixth control signal controls the second part of the switch in the sixth switch branch. The period of the sixth control signal is twice the period of the third reference pulse signal. The pulse of the sixth control signal corresponds to half of the pulse of the third reference pulse signal. The sixth control signal is different from the fourth control signal. The second reference pulse signal and the third reference pulse signal are obtained by delaying the first reference pulse signal by a first duration and a second duration, respectively. The duration of one cycle in the first reference pulse signal is greater than the first duration, which is greater than the duration of one pulse in the first reference pulse signal, which is greater than the second duration.

3. The signal combination circuit according to claim 1, characterized in that, The first switch branch includes a first switch and a second switch, the second switch branch includes a third switch and a fourth switch, and the third switch branch includes a fifth switch, a sixth switch, a seventh switch and an eighth switch; The first terminal of the first switch is used to input the first signal. The second terminal of the first switch is connected to the first terminal of the first energy storage branch and the first terminal of the fifth switch. The second terminal of the fifth switch is connected to the second terminal of the seventh switch, the first terminal of the third energy storage branch, and the output terminal of the first operational amplifier. The first terminal of the second switch, the first terminal of the fourth switch, and the second input terminal of the first operational amplifier are all grounded. The second terminal of the second switch is connected to the second terminal of the first energy storage branch and the first terminal of the sixth switch. The second terminal of the sixth switch is connected to the second terminal of the eighth switch, the second terminal of the third energy storage branch, and the first input terminal of the first operational amplifier. The first terminal of the third switch is used to input the second signal. The second terminal of the third switch is connected to the first terminal of the second energy storage branch and the first terminal of the seventh switch. The second terminal of the fourth switch is connected to the second terminal of the second energy storage branch and the first terminal of the eighth switch. The first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch are all connected to the controller.

4. The signal combination circuit according to claim 3, characterized in that, The fourth switch branch includes the ninth and tenth switches, the fifth switch branch includes the eleventh and twelfth switches, and the sixth switch branch includes the thirteenth, fourteenth, fifteenth, and sixteenth switches. The first terminal of the ninth switch is used to input the first signal. The second terminal of the ninth switch is connected to the first terminal of the fourth energy storage branch and the first terminal of the thirteenth switch. The second terminal of the thirteenth switch is connected to the second terminal of the fifteenth switch, the first terminal of the third energy storage branch, and the output terminal of the first operational amplifier. The first terminals of the tenth switch and the twelfth switch are both grounded. The second terminal of the tenth switch is connected to the second terminal of the fourth energy storage branch and the first terminal of the fourteenth switch. The second terminal of the fourteenth switch is connected to the second terminal of the sixteenth switch, the second terminal of the third energy storage branch, and the first input terminal of the first operational amplifier. The first terminal of the eleventh switch is used to input the second signal. The second terminal of the eleventh switch is connected to the first terminal of the fifth energy storage branch and the first terminal of the fifteenth switch. The second terminal of the twelfth switch is connected to the second terminal of the fifth energy storage branch and the first terminal of the sixteenth switch. The ninth switch, the tenth switch, the eleventh switch, the twelfth switch, the thirteenth switch, the fourteenth switch, the fifteenth switch, and the sixteenth switch are all connected to the controller.

5. The signal combination circuit according to claim 4, characterized in that, The first switch, the third switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch, the eleventh switch, the thirteenth switch, the fourteenth switch, the fifteenth switch, and the sixteenth switch each include three sub-switches; The three sub-switches include a first sub-switch, a second sub-switch, and a third sub-switch. The first sub-switch and the second sub-switch are connected in series. The connection point between the first sub-switch and the second sub-switch is connected to the first end of the third sub-switch. The second end of the third sub-switch is grounded. Wherein, the first end of the circuit formed by the first sub-switch and the second sub-switch connected in series is the first end of the corresponding switch, and the second end of the circuit formed by the first sub-switch and the second sub-switch connected in series is the second end of the corresponding switch.

6. The signal combination circuit according to claim 1, characterized in that, The first energy storage branch includes a first capacitor, the second energy storage branch includes a second capacitor, the third energy storage branch includes a third capacitor, the fourth energy storage branch includes a fourth capacitor, and the fifth energy storage branch includes a fifth capacitor. The two ends of the first capacitor are the two ends of the first energy storage branch, the two ends of the second capacitor are the two ends of the second energy storage branch, the two ends of the third capacitor are the two ends of the third energy storage branch, the two ends of the fourth capacitor are the two ends of the fourth energy storage branch, and the two ends of the fifth capacitor are the two ends of the fifth energy storage branch.

7. A current-sensing amplifier circuit, characterized in that, For connection to a first terminal of an inductive resistor, the second terminal of which is grounded, the inductive resistor being used to generate an inductive signal based on the induced current; The current sensing amplifier circuit includes a signal input terminal, a first switching branch, a second switching branch, a second operational amplifier, and a signal combination circuit as described in any one of claims 1-6; The second operational amplifier is connected between the first switching branch and the second switching branch. The first switching branch is connected to the signal input terminal. The first end of the signal input terminal is used to input a third signal. The second end of the signal input terminal is connected to the first end of the sensing resistor to input the sensing signal. The output terminal of the second operational amplifier is connected to the signal combination circuit through the second switching branch to output a first signal or a second signal to the signal combination circuit. The controller in the signal combination circuit is connected to the first switching branch and the second switching branch respectively. The controller is used to: control the first switching branch to switch the connection relationship between the input terminal of the second operational amplifier and the signal input terminal; Control the second switching branch to switch the connection between the output of the second operational amplifier and the signal combination circuit.

8. The current sensing amplifier circuit according to claim 7, wherein the controller is further configured to: Control the first switching branch to switch the connection of the first terminal of the input terminal of the second operational amplifier to the first terminal of the signal input terminal, and the connection of the second terminal of the input terminal of the second operational amplifier to the second terminal of the signal input terminal; and control the second switching branch to switch the connection of the first terminal of the output terminal of the second operational amplifier to the signal combination circuit. Alternatively, the first switching branch can be controlled to switch the connection between the second terminal of the input of the second operational amplifier and the first terminal of the signal input, and the first terminal of the input of the second operational amplifier and the second terminal of the signal input, and the second switching branch can be controlled to switch the connection between the second terminal of the output of the second operational amplifier and the signal combination circuit.

9. The current sensing amplifier circuit according to claim 7 or 8, wherein the controller is further configured to: At the moment when the first switching branch and the second switching branch perform a switching operation, control the first switching branch, the second switching branch, the fourth switching branch or the fifth switching branch in the signal combination circuit to be turned on. in, The first switch branch, the second switch branch, the fourth switch branch, and the fifth switch branch are sequentially connected.

Images