Continuous Output DC Microcurrent Device and Method
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-16
- Publication Date
- 2026-08-11
Smart Images
Figure CN121680552B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of precision electronics technology, and in particular to a device and method for continuously outputting DC microcurrent. Background Technology
[0002] In related technologies, capacitive microcurrent sources generate microcurrents by applying a highly linear line-varying voltage to a single differential capacitor. This approach offers the advantage of output current being independent of the load. However, because the amplitude of the line-varying voltage is limited by the circuit's operating range, there is an upper limit to the voltage amplitude, resulting in a periodic square wave output current, which cannot achieve continuous DC output. This periodically interrupted output is not only inconvenient to use in calibration or testing scenarios requiring long-term, stable, and uninterrupted DC microcurrents, but also easily introduces measurement errors, making it difficult to meet high-precision testing requirements.
[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art.
[0004] Application content In view of at least one of the above technical problems, this application provides a device and method for continuously outputting DC microcurrent.
[0005] In a first aspect, a device for continuously outputting DC microcurrent is provided, the device comprising: Line-converter voltage generator, used to generate voltage signals; The first differential capacitor and the second differential capacitor are used to convert voltage signals into current signals; Output voltage detection circuit, used to monitor the voltage signal of the line transformer voltage generator; A reset circuit is used to release the charge of the first differential capacitor or the second differential capacitor to reset it to zero potential; The switching execution circuit is used to change the state of the first differential capacitor or the second differential capacitor; The switching control circuit is configured to control the switching execution circuit to switch between the working state and the reset state when the output voltage detection circuit detects that the voltage signal has reached a preset threshold. Specifically, when one of the first differential capacitor or the second differential capacitor is in the working state and connected to the line voltage generator to output a current signal to the current output terminal; when the other of the first differential capacitor or the second differential capacitor is in the reset state and connected to the reset circuit to discharge.
[0006] In this device, when one differential capacitor reaches its voltage limit, another differential capacitor that has been reset immediately takes over, achieving seamless timing and overcoming the defect of outputting periodic square waves in existing technologies. It realizes continuous, time-indefinite DC micro-current output, making it particularly suitable for high-precision calibration scenarios that require long-term stable current excitation.
[0007] In some possible implementations, the switching execution circuit includes a first switch, a second switch, a third switch, and a fourth switch. The first switch is connected between the line voltage generator and the input terminal of the first differential capacitor. The second switch is connected between the output terminal of the first differential capacitor and the current output terminal. The third switch is connected between the line voltage generator and the input terminal of the second differential capacitor. The fourth switch is connected between the output terminal of the second differential capacitor and the current output terminal.
[0008] In some possible implementations, the switching control circuit is configured to: when the first differential capacitor is in the working state, control the first and second switches to close, and the third and fourth switches to open; when the output voltage detection circuit detects that the voltage has reached a preset threshold, control the first and second switches to open, control the third and fourth switches to close, and trigger the line voltage generator to reset to the initial voltage, causing the second differential capacitor to enter the working state and the first differential capacitor to enter the reset state; or When the second differential capacitor is in the working state, it controls the third and fourth switches to close, and the first and second switches to open. When the output voltage detection circuit detects that the voltage has reached the preset threshold, it controls the third and fourth switches to open, controls the first and second switches to close, and triggers the line voltage generator to reset to the initial voltage, so that the first differential capacitor enters the working state and the second differential capacitor enters the reset state.
[0009] In some possible implementations, the first switch, the second switch, the third switch, and the fourth switch are all optical MOS relays or analog switches.
[0010] In some possible implementations, the reset circuit may be selectively connected across either the first differential capacitor or the second differential capacitor.
[0011] In some possible implementations, the reset circuit includes a first operational amplifier and a reset switch unit. The non-inverting input of the first operational amplifier is grounded, and the inverting input of the first operational amplifier is shorted to its output. The inverting input of the first operational amplifier can be selectively connected to a first differential capacitor or a second differential capacitor through the reset switch unit. The reset switch unit is configured to operate in response to a signal from the switching control circuit.
[0012] In some possible implementations, the reset switch unit includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch. The first terminals of the fifth and sixth switches are connected, the second terminal of the fifth switch is connected to the inverting input terminal of the first operational amplifier, the first terminal of the seventh switch is connected to the first terminals of the fifth and sixth switches, the second terminal of the seventh switch is connected to the first terminal of the first differential capacitor, the third terminal of the seventh switch is connected to the first terminal of the second differential capacitor, the first terminal of the eighth switch is connected to the second terminal of the sixth switch, the second terminal of the eighth switch is connected to the second terminal of the first differential capacitor, and the third terminal of the eighth switch is connected to the second terminal of the second differential capacitor.
[0013] In some possible implementations, the seventh and eighth switches, under the control of the switching control circuit, select the first differential capacitor or the second differential capacitor for reset. The fifth and sixth switches, under the control of the switching control circuit, are turned on, so that the first differential capacitor or the second differential capacitor is shorted through the sixth switch and connected to the first operational amplifier through the fifth switch, thereby reducing the voltage across the first differential capacitor or the second differential capacitor to zero potential.
[0014] In some possible implementations, the output voltage detection circuit includes a sampling circuit, a voltage follower, and a voltage comparator. The sampling circuit is connected to the output of the line-transformer voltage generator, the input of the voltage follower is connected to the output of the sampling circuit, one input of the voltage comparator is connected to the output of the voltage follower, the other input of the voltage comparator is connected to the reference voltage terminal, and the output of the voltage comparator is connected to the switching control circuit.
[0015] Secondly, this application provides a method for continuously outputting DC microcurrent, implemented by a continuously outputting DC microcurrent device, the method comprising: The line transformer voltage generator outputs a linearly increasing voltage signal and outputs a current signal through the first differential capacitor. At the same time, the output voltage detection circuit monitors the voltage signal of the line transformer voltage generator. When the output voltage reaches the preset threshold, the switching control circuit controls the switching execution circuit to disconnect the first differential capacitor and connect the second differential capacitor to the line voltage generator, and continue to output the current signal through the second differential capacitor. The line voltage generator is reset to the initial voltage and resumes linear rise, and the first differential capacitor, which has been disconnected, is discharged and reset using the reset circuit. When the voltage signal is detected to reach the preset threshold again, the second differential capacitor is disconnected, the first differential capacitor is connected to the line voltage generator, and the line voltage generator and the second differential capacitor are reset, and so on in an alternating cycle.
[0016] The present application will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 This is a circuit diagram of the continuously output DC microcurrent device provided in the embodiments of this application; Figure 2 yes Figure 1 Circuit diagram of the output voltage detection circuit and reset circuit; Figure 3 This is a flowchart of the continuous output DC microcurrent method provided in the embodiments of this application; In the picture: 100. Line-to-line voltage generator; 200. Output voltage detection circuit; 210. Sampling circuit; 220. Voltage follower; 230. Voltage comparator; 300. Reset circuit; 310. Reset switch unit; 400. Switch the execution circuit; 500. Switching control circuit; 600. Current output terminal; C1, first differential capacitor; C2, second differential capacitor; U1, First operational amplifier; K5, Fifth switch; K6, Sixth switch; K7, Seventh switch; K8, Eighth switch; S1, first switch; S2, second switch; S3, third switch; S4, fourth switch; Detailed Implementation
[0019] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0020] like Figure 1 As shown, this embodiment provides a continuously output DC microcurrent device, which includes a line voltage generator 100, a first differential capacitor C1, a second differential capacitor C2, an output voltage detection circuit 200, a reset circuit 300, a switching execution circuit 400, and a switching control circuit 500.
[0021] Line voltage generator 100 is used to generate voltage signals; first differential capacitor C1 and second differential capacitor C2 are both used to convert voltage signals into current signals; output voltage detection circuit 200 is used to monitor the voltage signal of line voltage generator 100; reset circuit 300 is used to release the charge of first differential capacitor C1 or second differential capacitor C2 to reset it to zero potential; switching execution circuit 400 is used to change the state of first differential capacitor C1 or second differential capacitor C2; switching control circuit 500 is configured to control switching execution circuit 400 to switch between working state and reset state when output voltage detection circuit 200 detects that voltage signal reaches preset threshold.
[0022] The linear voltage generator 100 refers to a voltage source capable of generating a voltage that varies linearly with time. In this embodiment, based on... By providing a constant rate of voltage change, a constant direct current is generated across a capacitor with a fixed capacitance value.
[0023] The switching execution circuit 400 refers to a circuit composed of electronic switches or relays, whose function is to change the current flow path and realize the switching between the working state and the reset state of the first differential capacitor C1 or the second differential capacitor C2.
[0024] The switching control circuit 500 is connected to the line voltage generator 100, the output voltage detection circuit 200, and the switching execution circuit 400, respectively. In some embodiments, the switching control circuit 500 is an FPGA.
[0025] The first differential capacitor C1 and the second differential capacitor C2 should be high-stability precision capacitors with a capacitance matching degree better than 0.05% and consistent temperature coefficient and voltage coefficient, such as polystyrene capacitors or NPO / C0G ceramic capacitors, to ensure that the output current jump is minimal during switching.
[0026] When one of the first differential capacitor C1 or the second differential capacitor C2 is in the working state and connected to the line voltage generator 100 to output a current signal to the current output terminal 600; when the other of the first differential capacitor C1 or the second differential capacitor C2 is in the reset state and connected to the reset circuit 300 to discharge.
[0027] It is understandable that when the first differential capacitor C1 is in the working state, the second differential capacitor C2 is in the reset state. When the second differential capacitor C2 is in the working state, the first differential capacitor C1 is in the reset state.
[0028] For example, when the first differential capacitor C1 is in the working state, the second differential capacitor C2 is in the reset state. At this time, the voltage signal generated by the line-side voltage generator is output to the first differential capacitor C1, and the first differential capacitor C1 outputs a constant current signal. Simultaneously, the second differential capacitor C2 is connected to the reset circuit 300, releasing the previously accumulated charge. When the output voltage detection circuit 200 detects that the voltage signal of the line-side voltage generator 100 reaches a preset threshold, the output voltage detection circuit 200 sends a signal to the switching control circuit 500. The switching control circuit 500 activates, controlling the switching execution circuit 400 to connect the line-side voltage generator 100 to the second differential capacitor C2, causing the second differential capacitor C2 to enter the working state and output a current signal. Simultaneously, the first differential capacitor C1 is connected to the reset circuit 300 and enters the reset state. At the same time, the line-side voltage generator 100 resets to its initial voltage and resumes its linear rise.
[0029] The continuous output DC microcurrent device provided in this embodiment allows another reset differential capacitor to immediately take over the operation when one differential capacitor reaches its voltage limit, achieving seamless connection in time. This solves the defect of outputting periodic square waves in the prior art and realizes continuous DC microcurrent output without time limit. It is particularly suitable for high-precision calibration scenarios that require long-term stable current excitation.
[0030] like Figure 1 As shown, in some embodiments, the switching execution circuit 400 includes a first switch S1, a second switch S2, a third switch S3, and a fourth switch S4. The first switch S1 is connected between the input terminal of the online voltage generator 100 and the first differential capacitor C1. The second switch S2 is connected between the output terminal of the first differential capacitor C1 and the current output terminal 600. The third switch S3 is connected between the online voltage generator 100 and the input terminal of the second differential capacitor C2. The fourth switch S4 is connected between the output terminal of the second differential capacitor C2 and the current output terminal 600.
[0031] It is understandable that the first switch S1 and the third switch S3 serve as the input-side switches for the first differential capacitor C1 and the second differential capacitor C2, respectively. The second switch S2 and the fourth switch S4 serve as the output-side switches for the first differential capacitor C1 and the second differential capacitor C2, respectively.
[0032] For example, when the first differential capacitor C1 is in the working state, the first switch S1 and the second switch S2 are closed, and the third switch S3 and the fourth switch S4 are open. At this time, the voltage signal only acts on the first differential capacitor C1, and the current signal flows out through the second switch S2. When the second differential capacitor C2 is in the working state, the first switch S1 and the second switch S2 are open, and the third switch S3 and the fourth switch S4 are closed.
[0033] like Figure 1As shown, in some embodiments, the switching control circuit 500 is configured to: when the first differential capacitor C1 is in the working state, control the first switch S1 and the second switch S2 to close, and the third switch S3 and the fourth switch S4 to open; when the output voltage detection circuit 200 detects that the voltage reaches a preset threshold, control the first switch S1 and the second switch S2 to open, control the third switch S3 and the fourth switch S4 to close, and trigger the line voltage generator 100 to reset to the initial voltage, so that the second differential capacitor C2 enters the working state and the first differential capacitor C1 enters the reset state; or When the second differential capacitor C2 is in the working state, it controls the third switch S3 and the fourth switch S4 to close, and the first switch S1 and the second switch S2 to open. When the output voltage detection circuit 200 detects that the voltage reaches the preset threshold, it controls the third switch S3 and the fourth switch S4 to open, controls the first switch S1 and the second switch S2 to close, and triggers the line voltage generator 100 to reset to the initial voltage, so that the first differential capacitor C1 enters the working state and the second differential capacitor C2 enters the reset state.
[0034] It is understandable that the control terminals of the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are all connected to the switching control circuit 500. Thus, the switching control circuit 500 can simultaneously drive the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 to operate.
[0035] For example, the switching control circuit 500 controls the first switch S1 and the second switch S2 to close, and the third switch S3 and the fourth switch S4 to open. The voltage signal of the line voltage generator 100 rises from 0V, the first differential capacitor C1 is in working state, and the first differential capacitor C1 outputs a current signal. When the output voltage detection circuit 200 detects that the voltage signal reaches a preset threshold, it controls the first switch S1 and the second switch S2 to open, controls the third switch S3 and the fourth switch S4 to close, and triggers the line voltage generator 100 to reset to the initial voltage, so that the second differential capacitor C2 enters the working state and the first differential capacitor C1 enters the reset state.
[0036] For example, the switching control circuit 500 controls the first switch S1 and the second switch S2 to open, and the third switch S3 and the fourth switch S4 to close. The voltage signal of the line voltage generator 100 rises from 0V, the second differential capacitor C2 is in working state, and the second differential capacitor C2 outputs a current signal. When the output voltage detection circuit 200 detects that the voltage signal reaches a preset threshold, it controls the first switch S1 and the second switch S2 to close, controls the third switch S3 and the fourth switch S4 to open, and triggers the line voltage generator 100 to reset to the initial voltage, so that the first differential capacitor C1 enters the working state and the second differential capacitor C2 enters the reset state.
[0037] In this way, through the timing control described above, the line voltage generator 100 is ensured to always operate within its voltage range with the best linearity, avoiding nonlinear distortion that may occur in the line voltage generator 100, while ensuring the continuity of current output, so that the load end can reduce current fluctuations and meet the requirements of precision measurement for signal source stability.
[0038] In some embodiments, the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4 are all optical MOS relays or analog switches.
[0039] like Figure 1 As shown, in some embodiments, the reset circuit 300 may be selectively connected across the first differential capacitor C1 or the second differential capacitor C2.
[0040] Understandably, when the first differential capacitor C1 needs to be reset, the switching control circuit 500 controls the reset circuit 300 to connect with the first differential capacitor C1. When the second differential capacitor C2 needs to be reset, the switching control circuit 500 controls the reset circuit 300 to connect with the second differential capacitor C2.
[0041] like Figure 1 As shown, in some embodiments, the reset circuit 300 includes a first operational amplifier U1 and a reset switch unit 310. The non-inverting input terminal of the first operational amplifier U1 is grounded, and the inverting input terminal of the first operational amplifier U1 is shorted to its output terminal. The inverting input terminal of the first operational amplifier U1 can be selectively connected to a first differential capacitor C1 or a second differential capacitor C2 through the reset switch unit 310. The reset switch unit 310 is configured to operate in response to a signal from the switching control circuit 500.
[0042] When the first differential capacitor C1 needs to be reset, the switching control circuit 500 controls the reset switch unit 310 to operate, so that the two ends of the first differential capacitor C1 are connected to the inverting input terminal of the first operational amplifier U1. Since the non-inverting input terminal of the first operational amplifier U1 is grounded, according to the virtual short principle, the potential of the inverting input terminal of the first operational amplifier U1 is clamped at 0V. The output terminal of the first operational amplifier U1 absorbs the charge stored on the first differential capacitor C1 until the voltage across the first differential capacitor C1 is 0V.
[0043] It is worth noting that the reset process of the second differential capacitor C2 is the same as that of the first differential capacitor C1, and will not be described again here.
[0044] like Figure 1As shown, in some embodiments, the reset switch unit 310 includes a fifth switch K5, a sixth switch K6, a seventh switch K7, and an eighth switch K8. The first end of the fifth switch K5 and the first end of the sixth switch K6 are connected. The second end of the fifth switch K5 is connected to the inverting input of the first operational amplifier U1. The first end of the seventh switch K7 is connected to the first end of the fifth switch K5 and the first end of the sixth switch K6. The second end of the seventh switch K7 is connected to the first end of the first differential capacitor C1. The third end of the seventh switch K7 is connected to the first end of the second differential capacitor C2. The first end of the eighth switch K8 is connected to the second end of the sixth switch K6. The second end of the eighth switch K8 is connected to the second end of the first differential capacitor C1. The third end of the eighth switch K8 is connected to the second end of the second differential capacitor C2.
[0045] It is understandable that the fifth switch K5, the sixth switch K6, the seventh switch K7 and the eighth switch K8 are all controllably connected to the switching control circuit 500.
[0046] Specifically, under the control of the switching control circuit 500, the seventh switch K7 and the eighth switch K8 select the first differential capacitor C1 or the second differential capacitor C2 for reset. Under the control of the switching control circuit 500, the fifth switch K5 and the sixth switch K6 are turned on, so that the first differential capacitor C1 or the second differential capacitor C2 is shorted through the sixth switch K6 and connected to the first operational amplifier U1 through the fifth switch K5, thereby reducing the voltage across the first differential capacitor C1 or the second differential capacitor C2 to zero potential.
[0047] like Figure 1 As shown, in some embodiments, the output voltage detection circuit 200 includes a sampling circuit 210, a voltage follower 220, and a voltage comparator 230. The sampling circuit 210 is connected to the output terminal of the line voltage generator 100, the input terminal of the voltage follower 220 is connected to the output terminal of the sampling circuit 210, one input terminal of the voltage comparator 230 is connected to the output terminal of the voltage follower 220, the other input terminal of the voltage comparator 230 is connected to the reference voltage terminal, and the output terminal of the voltage comparator 230 is connected to the switching control circuit 500.
[0048] When the voltage signal output by the line voltage generator 100 rises, the voltage after being divided by the sampling circuit 210 also rises. When the divided voltage does not reach the voltage value of the reference voltage terminal, the comparator outputs a low level. When the divided voltage reaches the voltage value of the reference voltage terminal, the comparator outputs a high level, which in turn sends a signal to the switching control circuit 500, causing the switching control circuit 500 to drive the switching execution circuit 400 and the reset circuit 300 to operate.
[0049] It is understandable that the voltage value at the reference voltage terminal is the preset threshold, which is the maximum output voltage value of the line voltage generator 100.
[0050] This embodiment provides a method for continuously outputting DC microcurrent, implemented by a continuously outputting DC microcurrent device, the method including: The line voltage generator 100 outputs a linearly rising voltage signal and outputs a current signal through the first differential capacitor C1. At the same time, the output voltage detection circuit 200 monitors the voltage signal of the line voltage generator 100. When the output voltage is detected to reach the preset threshold, the switching control circuit 500 controls the switching execution circuit 400 to disconnect the connection of the first differential capacitor C1 and connect the second differential capacitor C2 to the line voltage generator 100, and continue to output the current signal through the second differential capacitor C2. The linear voltage generator 100 is reset to the initial voltage and resumes linear rise, and the first differential capacitor C1 is discharged and reset using the reset circuit 300. When the voltage signal is detected to reach the preset threshold again, the second differential capacitor C2 is disconnected, the first differential capacitor C1 is connected to the line voltage generator 100, and the line voltage generator 100 and the second differential capacitor C2 are reset, and so on in an alternating cycle.
[0051] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.
[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0054] The terms "coupled," "connected," or "connected" in the instruction manual include both direct and indirect connections. An indirect connection is a connection made through an intermediate medium, such as a connection made through an electrically conductive medium, which may have parasitic inductance or capacitance. An indirect connection may also include connections made through other active or passive devices to achieve the same or similar functional purpose, such as connections made through circuits or components such as switches or follower circuits.
[0055] In the detailed description of this specification, reference is made to the accompanying drawings, which form a part thereof, wherein like reference numerals always denote like parts, and wherein exemplary embodiments are shown by way of example that may be implemented. It should be understood that other embodiments may be utilized, and structural or logical changes may be made, without departing from the scope of this application. Therefore, the following detailed description should not be considered limiting.
[0056] The various operations in the specification may be described sequentially as multiple discrete actions or operations in a manner most conducive to understanding the claimed subject matter. However, the order of description should not be construed as implying that these operations must be sequentially related. Specifically, these operations may not be performed in the order presented. The described operations may be performed in a different order than in the described embodiments. Various additional operations may be performed in additional embodiments and / or the described operations may be omitted.
[0057] Various components and devices may be referred to or shown in the singular (e.g., “MOS transistor”, “transistor”, “switch”, etc.) in this document, but only for the convenience of discussion, and any element referred to in the singular may include multiple such elements as taught herein.
[0058] The above are merely preferred embodiments of this application and do not constitute any limitation on this application. Any person skilled in the art can make many possible variations and modifications to the technical solution of this application, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this application. Therefore, all equivalent changes made based on the shape, structure, and principle of this application without departing from the content of the technical solution of this application should be covered within the protection scope of this application.
Claims
1. A continuous output direct current microcurrent device, characterized in that, The device includes: Line-converter voltage generator, used to generate voltage signals; The first differential capacitor and the second differential capacitor are used to convert the voltage signal into a current signal; An output voltage detection circuit is used to monitor the voltage signal of the line transformer voltage generator; A reset circuit is used to release the charge of the first differential capacitor or the second differential capacitor to reset it to zero potential; A switching execution circuit is used to change the state of the first differential capacitor or the second differential capacitor; The switching control circuit is configured to control the switching execution circuit to operate when the output voltage detection circuit detects that the voltage signal reaches a preset threshold, so that the first differential capacitor or the second differential capacitor switches between a working state and a reset state. Specifically, when one of the first differential capacitor or the second differential capacitor is in the working state and connected to the line voltage generator to output a current signal to the current output terminal; when the other of the first differential capacitor or the second differential capacitor is in the reset state and connected to the reset circuit to discharge; The switching execution circuit includes a first switch, a second switch, a third switch, and a fourth switch. The first switch is connected between the line voltage generator and the input terminal of the first differential capacitor. The second switch is connected between the output terminal of the first differential capacitor and the current output terminal. The third switch is connected between the line voltage generator and the input terminal of the second differential capacitor. The fourth switch is connected between the output terminal of the second differential capacitor and the current output terminal. The switching control circuit is configured as follows: When the first differential capacitor is in the working state, the first and second switches are closed, and the third and fourth switches are open; when the output voltage detection circuit detects that the voltage reaches a preset threshold, the first and second switches are opened, the third and fourth switches are closed, and the line voltage generator is triggered to reset to the initial voltage, causing the second differential capacitor to enter the working state and the first differential capacitor to enter the reset state; or When the second differential capacitor is in the working state, the third and fourth switches are closed, and the first and second switches are opened; when the output voltage detection circuit detects that the voltage reaches a preset threshold, the third and fourth switches are opened, the first and second switches are closed, and the line voltage generator is triggered to reset to the initial voltage, so that the first differential capacitor enters the working state and the second differential capacitor enters the reset state.
2. The continuous output direct current microcurrent device of claim 1, wherein, The first switch, the second switch, the third switch, and the fourth switch are all optical MOS relays or analog switches.
3. The continuous output DC microcurrent device of claim 1, wherein, The reset circuit can be selectively connected across either the first differential capacitor or the second differential capacitor.
4. The continuous output direct current microcurrent device of claim 3, wherein, The reset circuit includes a first operational amplifier and a reset switch unit. The non-inverting input of the first operational amplifier is grounded, and the inverting input of the first operational amplifier is shorted to its output. The inverting input of the first operational amplifier can be selectively connected to the first differential capacitor or the second differential capacitor through the reset switch unit. The reset switch unit is configured to operate in response to a signal from the switching control circuit.
5. The continuous output DC microcurrent device of claim 4, wherein, The reset switch unit includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch. The first end of the fifth switch and the first end of the sixth switch are connected. The second end of the fifth switch is connected to the inverting input of the first operational amplifier. The first end of the seventh switch is connected to the first ends of the fifth switch and the sixth switch. The second end of the seventh switch is connected to the first end of the first differential capacitor. The third end of the seventh switch is connected to the first end of the second differential capacitor. The first end of the eighth switch is connected to the second end of the sixth switch. The second end of the eighth switch is connected to the second end of the first differential capacitor. The third end of the eighth switch is connected to the second end of the second differential capacitor.
6. The continuous output direct current microcurrent device of claim 5, wherein, The seventh and eighth switches, under the control of the switching control circuit, select the first differential capacitor or the second differential capacitor for reset. The fifth and sixth switches, under the control of the switching control circuit, are turned on, so that the first differential capacitor or the second differential capacitor is shorted through the sixth switch and connected to the first operational amplifier through the fifth switch, thereby reducing the voltage across the first differential capacitor or the second differential capacitor to zero potential.
7. The continuous output DC microcurrent device according to claim 1, characterized in that, The output voltage detection circuit includes a sampling circuit, a voltage follower, and a voltage comparator. The sampling circuit is connected to the output terminal of the line transformer voltage generator. The input terminal of the voltage follower is connected to the output terminal of the sampling circuit. One input terminal of the voltage comparator is connected to the output terminal of the voltage follower. The other input terminal of the voltage comparator is connected to the reference voltage terminal. The output terminal of the voltage comparator is connected to the switching control circuit.
8. A method for continuously outputting DC microcurrent, implemented by the continuously outputting DC microcurrent device according to any one of claims 1 to 7, characterized in that, The method includes: The line transformer voltage generator outputs a linearly increasing voltage signal and outputs a current signal through the first differential capacitor. At the same time, the output voltage detection circuit monitors the voltage signal of the line transformer voltage generator. When the output voltage reaches the preset threshold, the switching control circuit controls the switching execution circuit to disconnect the first differential capacitor and connect the second differential capacitor to the line voltage generator, and continue to output the current signal through the second differential capacitor. The line voltage generator is reset to the initial voltage and resumes linear rise, and the first differential capacitor, which has been disconnected, is discharged and reset using the reset circuit. When the voltage signal is detected to reach the preset threshold again, the second differential capacitor is disconnected, the first differential capacitor is connected to the line voltage generator, and the line voltage generator and the second differential capacitor are reset, and so on in an alternating cycle.
Citation Information
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