An electrical stimulation output open / short circuit protection circuit and an electrical stimulation therapy device

Abstract

This application discloses an open / short circuit protection circuit for electrical stimulation output and an electrical stimulation therapy device; relating to the field of electronic circuits, it solves the problem of misjudgment caused by the inability to distinguish between short circuits and open circuits in electrical stimulation therapy devices. Through a sampling control circuit, a trigger signal is output when the PWM signal is high, and remains silent when it is low. After receiving the trigger signal, the sampling processing module immediately collects current and voltage signals, performs calculations and judgments, and sends the results to the controller. Based on the open / short circuit judgment results sent by the sampling processing module, the controller executes corresponding protection operations. The connection between the sampling control circuit and the sampling processing module enables precise control of the sampling timing, improves the real-time performance and accuracy of signal acquisition, ensures timely measures to protect patient safety in the event of an open circuit or short circuit, and reduces the risk of treatment interruption or failure due to circuit faults.

Description

Technical Field

[0001] This application relates to the field of electronic circuits, and in particular to an open / short circuit protection circuit for electrical stimulation output and an electrical stimulation therapy device. Background Technology

[0002] Protection against short circuits and open circuits in rehabilitation electrical stimulation therapy outputs is an essential requirement in industry standards. Currently, many devices on the market are not ideal for short circuit protection, failing to provide adequate protection and impacting both the doctor's and patient's treatment outcomes. Industry standards require that when a short circuit or open circuit occurs in an output channel with an effective output current of 1mA or higher, the therapy device should disconnect all output channels and issue a warning.

[0003] Open and short circuits are generally identified by calculating the number of output pulses and the actual number of sampled pulses using an external interrupt output signal. However, open and short circuits cannot be distinguished between resistors.

[0004] Therefore, how to solve the problem of misjudgment caused by the inability to distinguish between short circuits and open circuits in electrical stimulation therapy devices is a technical problem that urgently needs to be solved by those in the field. Summary of the Invention

[0005] The purpose of this application is to provide an open / short circuit protection circuit for electrical stimulation output and an electrical stimulation therapy device, so as to solve the problem of misjudgment caused by the inability to distinguish between short circuit and open circuit when the electrical stimulation therapy device is in operation.

[0006] To solve the above-mentioned technical problems, this application provides an open / short circuit protection circuit for electrical stimulation output, comprising:

[0007] Current acquisition circuit, voltage acquisition circuit, sampling processing module, sampling control circuit, controller;

[0008] The current acquisition circuit and the voltage acquisition circuit are connected to the electrical stimulation signal output circuit; the electrical stimulation signal output circuit is connected to the PWM control terminal of the controller; the PWM control terminal of the controller is connected to the input terminal of the sampling control circuit; the output terminal of the sampling control circuit is connected to the sampling processing module; and the sampling processing module is connected to the output terminals of the current acquisition circuit and the voltage acquisition circuit.

[0009] The sampling control circuit receives a PWM signal and outputs a trigger signal when it is high. When the sampling processing module receives the trigger signal, it collects the current signal and voltage signal sent by the current acquisition circuit and the voltage acquisition circuit, and obtains the real-time resistance value based on the current signal and the voltage signal. It then determines whether an open circuit or a short circuit has occurred based on the preset short circuit threshold and the preset open circuit threshold. The sampling processing module sends the open / short circuit information to the controller.

[0010] As an optional solution, in the above-mentioned electrical stimulation output open / short circuit protection circuit, the sampling control circuit includes: a first switching transistor, a first optocoupler, a second optocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor;

[0011] The control terminal of the first switching transistor is connected to the PWM control terminal of the controller and the first terminal of the first resistor; the second terminal of the first switching transistor is connected to the second terminal of the first resistor and the ground terminal; the first terminal of the first switching transistor is connected to the negative terminals of the first and second optocouplers; the positive terminal of the first optocoupler is connected to the power supply through the second resistor, and the positive terminal of the second optocoupler is connected to the power supply through the fourth resistor; the collector of the first optocoupler is connected to the isolated positive power supply, and the collector of the second optocoupler is connected to the isolated positive power supply through the fifth resistor; the emitter of the first optocoupler is connected to the isolated negative power supply through the third resistor, and the emitter of the second optocoupler is grounded; the emitter of the first optocoupler is connected to the control terminals of the current acquisition circuit and the voltage acquisition circuit, and the collector of the second optocoupler serves as the output terminal of the sampling control circuit.

[0012] As an optional solution, in the above-mentioned electrical stimulation output open / short circuit protection circuit, the current acquisition circuit includes: a second switching transistor, a third switching transistor, a first diode, a second diode, a first capacitor, a sixth resistor, and a seventh resistor;

[0013] The current sampling terminal of the electrical stimulation signal output circuit is connected to the first terminal of the second switching transistor, the second terminal of the second switching transistor is connected to the first terminal of the third switching transistor, the second terminal of the third switching transistor is connected to the first terminal of the first capacitor, the first terminal of the seventh resistor, the cathode of the first diode, and the anode of the second diode through the sixth resistor, the second terminal of the first capacitor, the second terminal of the seventh resistor, and the anode of the first diode are grounded; the cathode of the second diode is connected to the isolation positive power supply; the control terminals of the second and third switching transistors are connected to the emitter of the first optocoupler; the second terminal of the sixth resistor serves as the output terminal of the current acquisition circuit and is connected to the current port of the sampling processing module.

[0014] As an optional solution, in the above-mentioned electrical stimulation output open / short circuit protection circuit, the voltage acquisition circuit includes: a fourth switching transistor, a fifth switching transistor, a third diode, a fourth diode, a second capacitor, an eighth resistor, and a ninth resistor;

[0015] The current sampling terminal of the electrical stimulation signal output circuit is connected to the first terminal of the fourth switch transistor. The second terminal of the fourth switch transistor is connected to the first terminal of the fifth switch transistor. The second terminal of the fifth switch transistor is connected to the first terminal of the second capacitor, the first terminal of the ninth resistor, the cathode of the third diode, and the anode of the fourth diode through the eighth resistor. The second terminal of the second capacitor, the second terminal of the ninth resistor, and the anode of the third diode are grounded. The cathode of the fourth diode is connected to the isolation positive power supply. The control terminals of the fourth and fifth switches transistors are connected to the emitter of the first optocoupler. The second terminal of the eighth resistor serves as the output terminal of the voltage acquisition circuit and is connected to the voltage port of the sampling processing module.

[0016] As an optional solution, in the above-mentioned electrical stimulation output open / short circuit protection circuit, the sampling processing module includes: a microcontroller unit and a download interface terminal;

[0017] The first input terminal of the microcontroller is connected to the output terminal of the sampling control circuit, the second input terminal of the microcontroller is connected to the output terminal of the current acquisition circuit, the third input terminal of the microcontroller is connected to the output terminal of the voltage acquisition circuit, the clock port of the microcontroller is connected to the clock port of the download interface terminal, and the data output terminal of the microcontroller is connected to the data line port of the download interface terminal.

[0018] As an optional solution, the above-mentioned electrical stimulation output open / short circuit protection circuit further includes: a communication transmission circuit; the communication transmission circuit includes a first communication circuit and a second communication circuit;

[0019] The sampling processing module is connected to the controller through the first communication circuit and the second communication circuit;

[0020] The first communication circuit transmits the data output by the sampling processing module to the controller;

[0021] The second communication circuit sends the controller output signal to the sampling processing module.

[0022] As an optional solution, in the above-mentioned electrical stimulation output open and short circuit protection circuit, the first communication circuit includes: a sixth switch, a third optocoupler, an eleventh resistor, a twelfth resistor, and a thirteenth resistor;

[0023] The control terminal of the sixth switch is connected to the first terminal of the eleventh resistor and the data line port of the download interface terminal. The second terminal of the sixth switch and the second terminal of the eleventh resistor are grounded. The first terminal of the sixth switch is connected to the negative terminal of the third optocoupler. The positive terminal of the third optocoupler is connected to the isolation positive power supply through the twelfth resistor. The collector of the third optocoupler is connected to the power supply through the thirteenth resistor. The emitter of the third optocoupler is grounded. The collector of the third optocoupler is connected to the timing input / output port of the controller.

[0024] As an optional solution, in the above-mentioned electrical stimulation output open / short circuit protection circuit, the second communication circuit includes: a seventh switch, a fourth optocoupler, a fourteenth resistor, a fifteenth resistor, and a sixteenth resistor;

[0025] The control terminal of the seventh switch is connected to the first terminal of the fourteenth resistor and the mode control port of the controller; the second terminal of the seventh switch and the second terminal of the fourteenth resistor are grounded; the first terminal of the seventh switch is connected to the negative terminal of the fourth optocoupler; the positive terminal of the fourth optocoupler is connected to the power supply through the fifteenth resistor; the collector of the fourth optocoupler is connected to the isolation positive power supply through the sixteenth resistor; the emitter of the fourth optocoupler is grounded; and the collector of the fourth optocoupler is connected to the mode control port of the microcontroller unit.

[0026] As an optional solution, the above-mentioned electrical stimulation output open / short circuit protection circuit also includes: a power supply isolation circuit;

[0027] The input terminal of the power isolation circuit is connected to the power supply, and the output terminal of the power isolation battery includes an isolated negative power supply and an isolated positive power supply.

[0028] To solve the above-mentioned technical problems, this application also provides an electrical stimulation therapy device, including the above-mentioned electrical stimulation output open / short circuit protection circuit.

[0029] The open / short circuit protection circuit for the electrical stimulation output provided in this application outputs a trigger signal when the PWM signal is high and remains silent when it is low. Upon receiving the trigger signal, the sampling processing module immediately acquires current and voltage signals, performs calculations and judgments, and sends the results to the controller. Based on the open / short circuit judgment results sent by the sampling processing module, the controller executes corresponding protection operations. The connection between the sampling control circuit and the sampling processing module enables precise control of the sampling timing, improves the real-time performance and accuracy of signal acquisition, ensures timely measures to protect patient safety in the event of an open or short circuit, and reduces the risk of treatment interruption or failure due to circuit faults.

[0030] In addition, this application also provides an electrical stimulation therapy device, including the above-mentioned electrical stimulation output open / short circuit protection circuit, with the same effect. Attached Figure Description

[0031] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments 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.

[0032] Figure 1 This is a schematic diagram of an electrical stimulation output open / short circuit protection circuit provided in an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of a sampling control circuit provided in an embodiment of this application;

[0034] Figure 3 A circuit diagram of an electrical stimulation signal output circuit is provided in this application embodiment;

[0035] Figure 4 This is a schematic diagram of a current acquisition circuit provided in an embodiment of this application;

[0036] Figure 5 This is a schematic diagram of a voltage acquisition circuit provided in an embodiment of this application;

[0037] Figure 6 This is a schematic diagram of a sampling processing module provided in an embodiment of this application;

[0038] Figure 7 A schematic diagram of a first communication circuit provided in an embodiment of this application;

[0039] Figure 8 A schematic diagram of a second communication circuit provided in an embodiment of this application;

[0040] Figure 9 This is a schematic diagram of a power isolation circuit provided in an embodiment of this application. Detailed Implementation

[0041] 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, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0042] The core of this application is to provide an open / short circuit protection circuit for electrical stimulation output and an electrical stimulation therapy device.

[0043] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] This application relates to protecting the treatment head from short circuits and open circuits during the electrical stimulation output process of low- and medium-frequency electrotherapy products. This protection method is particularly suitable for applications requiring precise control of the treatment current to ensure patient safety and therapeutic effectiveness, such as rehabilitation therapy centers and home rehabilitation equipment. These environments typically demand high-precision, real-time detection and protection capabilities from the circuitry to avoid potential risks caused by treatment head detachment or short circuits, thus protecting patient safety.

[0045] To address the aforementioned problems, embodiments of this application provide an open / short circuit protection circuit for electrical stimulation output, such as... Figure 1 As shown, it includes:

[0046] 11 Current acquisition circuit, 12 Voltage acquisition circuit, 13 Sampling processing module, 14 Sampling control circuit, 15 Controller;

[0047] The current acquisition circuit 11 and the voltage acquisition circuit 12 are connected to the electrical stimulation signal output circuit; the electrical stimulation signal output circuit is connected to the PWM control terminal of the controller 15; the PWM control terminal of the controller 15 is connected to the input terminal of the sampling control circuit 14, the output terminal of the sampling control circuit 14 is connected to the sampling processing module 13, and the sampling processing module 13 is connected to the output terminals of the current acquisition circuit 11 and the voltage acquisition circuit 12.

[0048] The sampling control circuit 14 receives the PWM signal and outputs a trigger signal when it is high. When the sampling processing module 13 receives the trigger signal, it collects the current signal and voltage signal sent by the current acquisition circuit 11 and the voltage acquisition circuit 12, and obtains the real-time resistance value based on the current signal and voltage signal. It then determines whether an open circuit or a short circuit has occurred based on the preset short circuit threshold and the preset open circuit threshold. The sampling processing module 13 sends the open / short circuit signal to the controller 15.

[0049] In this embodiment, the current acquisition circuit 11 converts the current signal into a voltage signal for acquisition via a resistor connected in series in the electrical stimulation signal output circuit. Real-time acquisition of the current value in the electrical stimulation signal output circuit provides data support for subsequent open / short circuit detection. This method is not limited to resistor conversion; other current acquisition methods such as Hall effect sensors can also be used.

[0050] The voltage acquisition circuit 12 acquires the voltage signal through a voltage divider or voltage follower connected in parallel with the electrical stimulation signal output circuit. It acquires the voltage value in the electrical stimulation signal output circuit in real time, which, together with the current signal, is used to calculate the real-time resistance value. A suitable voltage acquisition circuit 12 structure can be selected according to the actual circuit requirements.

[0051] The sampling processing module 13 is typically a module composed of a microprocessor or a dedicated signal processing chip. It receives the trigger signal sent by the sampling control circuit 14, acquires the current and voltage signals sent by the current acquisition circuit 11 and the voltage acquisition circuit 12, calculates the real-time resistance value, and determines whether an open circuit or short circuit has occurred based on preset short-circuit and open-circuit thresholds. It can be a dedicated chip integrating an analog-to-digital converter (AD converter) and processing logic, or a microprocessor module with similar functions.

[0052] The sampling control circuit 14 receives the pulse width modulation (PWM) signal from the controller 15 and outputs a trigger signal to the sampling processing module 13 when it is high, triggering it to acquire signals. Depending on specific circuit requirements, the specific components and connections of the sampling control circuit 14 may be adjusted, but the basic principle remains the same.

[0053] The controller 15 is typically implemented as a microprocessor or microcontroller. It generates PWM signals to control the electrical stimulation signal output circuit, receives open / short circuit judgment results from the sampling and processing module 13, and performs corresponding protection operations (such as interrupt output, alarm, etc.) based on the results. The appropriate controller 15 model should be selected according to system requirements and performance specifications.

[0054] The controller 15 can control the output intensity and frequency of the electrical stimulation signal via the PWM signal. The sampling control circuit 14 outputs a trigger signal based on the high level of the PWM signal, triggering the sampling processing module 13 to acquire the signal.

[0055] The sampling control circuit 14 outputs a trigger signal when the PWM signal is high and remains silent when it is low, ensuring that the sampling processing module 13 only acquires signals when needed, thus reducing power consumption. Upon receiving the trigger signal, the sampling processing module 13 immediately acquires current and voltage signals, performs calculations and judgments, and sends the results to the controller 15. The controller 15 executes corresponding protection operations, such as interrupt output and alarm, based on the open / short circuit judgment results sent by the sampling processing module 13. For example, the preset short-circuit threshold is 100Ω, and the preset open-circuit threshold is 5KΩ.

[0056] The connection between the sampling control circuit 14 and the sampling processing module 13 enables precise control of the sampling timing, improving the real-time performance and accuracy of signal acquisition. The connection between the current acquisition circuit 11, the voltage acquisition circuit 12, and the sampling processing module 13 ensures that the acquired current and voltage signals can be processed and analyzed promptly and accurately. The controller 15 ensures that timely measures can be taken to protect patient safety in the event of an open circuit or short circuit.

[0057] The current sampling control circuit 14 can be replaced by other circuits that can generate trigger signals, such as using timer interrupts to generate trigger signals.

[0058] In this embodiment, the sampling control circuit 14 must be able to accurately receive PWM signals and output trigger signals; the sampling processing module 13 must have the ability to calculate and judge open and short circuits in real time. The specific implementation of the current acquisition circuit 11 and the voltage acquisition circuit 12 can be adjusted according to actual needs; the model and performance of the controller 15 can be selected according to system requirements and cost budget.

[0059] For example, suppose that in a low-to-medium frequency electrotherapy product, the treatment head accidentally detaches, causing an open circuit. At this time, the current acquisition circuit 11 detects a sharp drop in current, while the voltage acquisition circuit 12 detects that the voltage remains unchanged (because the circuit impedance is extremely high during an open circuit). The sampling and processing module 13 calculates based on the acquired current and voltage signals that the real-time resistance is much greater than the preset open circuit threshold, thus determining an open circuit state. Subsequently, the sampling and processing module 13 sends the open circuit determination result to the controller 15, which immediately interrupts the electrical stimulation signal output and activates the alarm mechanism, effectively protecting the patient's safety.

[0060] The open / short circuit protection circuit for electrical stimulation output provided in this application embodiment uses a sampling control circuit 14 to output a trigger signal when the PWM signal is high and remain silent when it is low. Upon receiving the trigger signal, the sampling processing module 13 immediately acquires current and voltage signals, performs calculations and judgments, and sends the results to the controller 15. The controller 15 executes corresponding protection operations based on the open / short circuit judgment results sent by the sampling processing module 13. The connection between the sampling control circuit 14 and the sampling processing module 13 enables precise control of the sampling timing, improves the real-time performance and accuracy of signal acquisition, ensures timely measures to protect patient safety in the event of an open or short circuit, and reduces the risk of treatment interruption or failure due to circuit faults.

[0061] As an optional solution, in the above-mentioned electrical stimulation output open / short circuit protection circuit, Figure 2 This application provides a schematic diagram of a sampling control circuit according to an embodiment; as shown below. Figure 2 As shown, the sampling control circuit 14 includes: a first switch Q1, a first optocoupler OP1, a second optocoupler OP2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5.

[0062] The control terminal of the first switching transistor Q1 is connected to the PWM control terminal (PWM2) of the controller 15 and the first terminal of the first resistor R1. The second terminal of the first switching transistor Q1 is connected to the second terminal of the first resistor R1 and the ground terminal. The first terminal of the first switching transistor Q1 is connected to the negative terminal of the first optocoupler OP1 and the negative terminal of the second optocoupler OP2. The positive terminal of the first optocoupler OP1 is connected to the power supply through the second resistor R2, and the positive terminal of the second optocoupler OP2 is connected to the power supply through the fourth resistor R4. The collector of the first optocoupler OP1 is connected to the isolated positive power supply, and the collector of the second optocoupler OP2 is connected to the isolated positive power supply through the fifth resistor R5. The emitter of the first optocoupler OP1 is connected to the isolated negative power supply through the third resistor R3, and the emitter of the second optocoupler OP2 is grounded. The emitter (MOS drive1) of the first optocoupler OP1 is connected to the control terminal of the current acquisition circuit 11 and the voltage acquisition circuit 12, and the collector of the second optocoupler OP2 serves as the output terminal (TEST EN1) of the sampling control circuit 14.

[0063] The first switching transistor Q1 can be implemented as a Metal-Oxide-Semiconductor Field-Effect Transistor (MOS) or an NPN (Negative-Positive-Negative) transistor. It acts as a switch for the PWM signal, controlling the triggering of the sampling circuit. When the PWM signal is high, the first switching transistor Q1 turns on, causing the negative terminals of the first optocoupler OP1 and the second optocoupler OP2 to acquire a potential, thereby triggering the optocouplers to operate. A suitable switching transistor model can be selected based on circuit requirements and the driving capability of the PWM signal from the controller 15.

[0064] Electrical isolation is achieved through the first optocoupler OP1 and the second optocoupler OP2, isolating the PWM signal of the controller 15 from the sampling circuit and protecting the controller 15 from high voltage or high current. Simultaneously, the output signals of the first optocoupler OP1 and the second optocoupler OP2 are used to control the sampling timing of the sampling processing module 13.

[0065] The first resistor, R1, acts as a current-limiting resistor, protecting the switching transistor from excessive current surges. The second resistor, R2, and the fourth resistor, R4, provide operating current to the optocoupler, ensuring its proper functioning. The third resistor, R3, acts as a pull-down resistor, ensuring the emitter of the first optocoupler, OP1, is at a low level when there is no signal. The fifth resistor, R5, also acts as a current-limiting resistor and, in conjunction with the isolation positive power supply, provides a suitable potential to the collector of the second optocoupler, OP2.

[0066] The collector of the second optocoupler OP2 serves as the output terminal. When the PWM signal is triggered, it outputs a high-level signal to the sampling processing module 13, instructing it to sample the current and voltage.

[0067] During normal operation, the PWM signal periodically triggers the switching transistor to turn on and off, thereby controlling the switching state of the optocoupler. When the PWM signal is high, the switching transistor is on, the optocoupler operates, and a trigger signal is output to the sampling and processing module 13; when the PWM signal is low, the switching transistor is off, the optocoupler does not operate, and no trigger signal is output.

[0068] The output signal is the inverse of the drive signal. The current drive signal is active low. The microcontroller interrupts on the falling edge and starts a delay to collect current and voltage data.

[0069] While ensuring the basic functions are implemented, the specific layout and wiring of the circuit can be flexibly designed according to the actual situation. This embodiment achieves an organic combination of PWM signal transmission, electrical isolation, sampling triggering, and other functions through reasonable connection relationships. This improves the reliability and safety of the circuit, ensuring that the sampling processing module 13 can accurately and in real time acquire current and voltage signals, thereby realizing open-circuit and short-circuit protection for the electrical stimulation output circuit.

[0070] Figure 3 A circuit diagram of an electrical stimulation signal output circuit provided in an embodiment of this application is shown below. Figure 3 As shown, the controller outputs a modulation control signal through the modulation output circuit, which is input to ports T1-1 and PGND1. The controller outputs a PWM control signal through ports PWM1 and PWM2 to control the conduction of the switching transistor Q01 and control the output of the electrical stimulation signal (OUT1-1, OUT1-2).

[0071] As an optional solution, in the above-mentioned electrical stimulation output open / short circuit protection circuit, Figure 4 This application provides a schematic diagram of a current acquisition circuit according to an embodiment; as shown below. Figure 4 As shown, the current acquisition circuit 11 includes: a second switch Q2, a third switch Q3, a first diode D1, a second diode D2, a first capacitor C1, a sixth resistor R6, and a seventh resistor R7.

[0072] The current sampling terminal (I_COLLECT1) of the electrical stimulation signal output circuit is connected to the first terminal of the second switch Q2. The second terminal of the second switch Q2 is connected to the first terminal of the third switch Q3. The second terminal of the third switch Q3 is connected to the first terminal of the first capacitor C1, the first terminal of the seventh resistor R7, the cathode of the first diode D1, and the anode of the second diode D2 through the sixth resistor R6. The second terminal of the first capacitor C1, the second terminal of the seventh resistor R7, and the anode of the first diode D1 are grounded. The cathode of the second diode D2 is connected to the isolation positive power supply. The control terminals (MOS drive1) of the second switch Q2 and the third switch Q3 are connected to the emitter of the first optocoupler OP1. The second terminal of the sixth resistor R6 serves as the output terminal (TEST_I1) of the current acquisition circuit 11 and is connected to the current port of the sampling processing module 13.

[0073] In the electrical stimulation signal output circuit, resistor R03 serves as the sampling resistor and as the current sampling terminal (I_COLLECT1).

[0074] The second switch Q2 works in conjunction with the first switch Q1 to control the current flow. The first diode D1 acts as a rectifier to prevent reverse current flow. The second diode D2 works in conjunction with the first diode D1 to form a voltage regulator circuit. The first capacitor C1 is used for filtering and smoothing current fluctuations.

[0075] The current sampling terminal of the electrical stimulation signal output circuit is connected to the first terminal (such as the collector or drain) of the second switching transistor Q2 to introduce the current to be sampled. The flow of current is controlled by controlling the on / off state of the second switching transistor Q2.

[0076] When current flows through the electrical stimulation signal output circuit, this current enters the current acquisition circuit 11 through the second switch Q2. By controlling the on / off states of the second switch Q2 and the third switch Q3, current sampling can be achieved. The sampled current generates a voltage drop across the sixth resistor R6, which is converted into a voltage signal for acquisition. Simultaneously, the first capacitor C1 and the seventh resistor R7 form a filter circuit to smooth current fluctuations and improve sampling accuracy. The first diode D1 and the second diode D2 form a voltage regulator circuit to prevent damage to the circuit from excessively high or low voltage. The sampled voltage signal is transmitted to the sampling processing module 13 for processing and judgment through the output terminal of the sixth resistor R6.

[0077] This embodiment reduces the impact of current fluctuations and voltage changes on sampling accuracy through the design of filtering and voltage regulation circuits. Optical isolation is used to control signal transmission, improving the circuit's anti-interference capability and stability. The current acquisition function is achieved with fewer components, reducing circuit complexity and cost.

[0078] As an optional solution, in the above-mentioned electrical stimulation output open / short circuit protection circuit, Figure 5 This application provides a schematic diagram of a voltage acquisition circuit according to an embodiment; as shown below. Figure 5 As shown, the voltage acquisition circuit 12 includes: a fourth switch Q4, a fifth switch Q5, a third diode D3, a fourth diode D4, a second capacitor C2, an eighth resistor R8, and a ninth resistor R9.

[0079] The current sampling terminal (V_COLLECT1) of the electrical stimulation signal output circuit is connected to the first terminal of the fourth switch Q4. The second terminal of the fourth switch Q4 is connected to the first terminal of the fifth switch Q5. The second terminal of the fifth switch Q5 is connected to the first terminal of the second capacitor C2, the first terminal of the ninth resistor R9, the cathode of the third diode D3, and the anode of the fourth diode D4 through the eighth resistor R8. The second terminal of the second capacitor C2, the second terminal of the ninth resistor R9, and the anode of the third diode D3 are grounded. The cathode of the fourth diode D4 is connected to the isolation positive power supply. The control terminals (MOS drive1) of the fourth switch Q4 and the fifth switch Q5 are connected to the emitter of the first optocoupler OP1. The second terminal of the eighth resistor R8 serves as the output terminal (TEST_V1) of the voltage acquisition circuit 12 and is connected to the voltage port of the sampling processing module 13.

[0080] In the electrical stimulation signal output circuit, resistors R01 and R02 form a voltage divider circuit, and the midpoint of resistors R01 and R02 serves as the voltage sampling terminal (V_COLLECT1).

[0081] The fourth switch Q4 works in conjunction with the other switches to achieve voltage sampling and control. The third diode D3 works in conjunction with the other switches to form a voltage regulator circuit.

[0082] The current sampling terminal of the electrical stimulation signal output circuit is connected to the first terminal of the fourth switch Q4 to introduce the voltage to be sampled, and the voltage flow is controlled by controlling the on and off of the fourth switch Q4.

[0083] When a voltage exists in the electrical stimulation signal output circuit, this voltage enters the voltage acquisition circuit 12 through the fourth switch Q4. By controlling the on / off states of the fourth switch Q4 and the fifth switch Q5, voltage sampling can be achieved. The sampled voltage generates a voltage drop across the eighth resistor R8, which is converted into an acquireable signal. Simultaneously, the second capacitor C2 and the ninth resistor R9 form a filter circuit to smooth voltage fluctuations and improve sampling accuracy. The third diode D3 and the fourth diode D4 form a voltage regulator circuit to prevent damage to the circuit from excessively high or low voltage. The sampled voltage signal is transmitted to the sampling processing module 13 for processing and judgment through the output terminal of the eighth resistor R8.

[0084] By designing filtering and voltage regulation circuits, the impact of voltage fluctuations on sampling accuracy was reduced. Optical isolation control signal transmission was employed, improving the circuit's anti-interference capability and stability. Voltage acquisition was achieved using fewer components, reducing circuit complexity and cost.

[0085] As an optional solution, in the above-mentioned electrical stimulation output open / short circuit protection circuit, Figure 6 This application provides a schematic diagram of a sampling processing module according to an embodiment; as shown below. Figure 6 As shown, the sampling processing module 13 includes: a microcontroller unit U2 and a download interface terminal J10;

[0086] The first input terminal (TEST EN) of the microcontroller U2 is connected to the output terminal of the sampling control circuit 14, the second input terminal (TEST I1) of the microcontroller U2 is connected to the output terminal of the current acquisition circuit 11, the third input terminal (TEST V1) of the microcontroller U2 is connected to the output terminal of the voltage acquisition circuit 12, the clock port (TEST I1) of the microcontroller U2 is connected to the clock port of the download interface terminal J10, and the data output terminal (TDIO1) of the microcontroller U2 is connected to the data line port of the download interface terminal J10.

[0087] The microcontroller unit U2 (MCU) processes the signals output from the sampling control circuit 14, the current acquisition circuit 11, and the voltage acquisition circuit 12, and performs logic judgments and control. The download interface terminal J10 is used to communicate with external devices to transmit data and download programs. The microcontroller unit controls the delay and acquisition of peak voltages; the specific acquisition mode can be set according to requirements, such as acquiring each waveform once, averaging eight acquisitions, or averaging eight acquisitions of each waveform.

[0088] The clock port of the microcontroller unit U2 is connected to the clock port of the download interface terminal J10 to achieve clock signal synchronization. The data output terminal of the microcontroller unit U2 is connected to the data line port of the download interface terminal J10 to achieve data transmission.

[0089] When the sampling control circuit 14 outputs a trigger signal, the microcontroller unit U2 starts working, acquiring current and voltage sampling signals from the current acquisition circuit 11 and the voltage acquisition circuit 12, respectively. The microcontroller unit U2 processes these signals and performs logical judgments to determine whether there is an open circuit or short circuit fault in the electrical stimulation output circuit. The processing result is transmitted to the download interface terminal J10 through the data output terminal for external devices to read or further process.

[0090] The microcontroller unit U2 performs precise processing of the sampled signals, improving the accuracy of fault diagnosis. Communication with external devices is achieved via the download interface terminal J10, facilitating data transmission and program updates. The integrated signal processing functionality of the microcontroller unit U2 reduces circuit complexity and lowers costs.

[0091] As an optional solution, the above-mentioned electrical stimulation output open / short circuit protection circuit also includes: a communication transmission circuit; the communication transmission circuit includes a first communication circuit and a second communication circuit;

[0092] The sampling processing module 13 is connected to the controller 15 through the first communication circuit and the second communication circuit;

[0093] The first communication circuit sends the data output by the sampling processing module 13 to the controller 15;

[0094] The second communication circuit sends the output signal of the controller 15 to the sampling and processing module 13.

[0095] The first communication circuit is used to transmit the output data of the sampling processing module 13 to the controller 15. The second communication circuit is used to transmit the output signal of the controller 15 to the sampling processing module 13.

[0096] The sampling and processing module 13 transmits the collected current, voltage, and other data to the controller 15 via the first communication circuit. The controller 15 determines the operating status of the electrical stimulation output circuit based on the received data and decides whether to take protective measures. The controller 15 also sends control signals (such as switching commands, parameter adjustments, etc.) to the sampling and processing module 13 via the second communication circuit. The sampling and processing module 13 adjusts the operating status of the electrical stimulation output circuit based on the received signals to ensure its safe operation.

[0097] By implementing bidirectional data and control signal transmission through independent communication circuits, the system's response speed and processing efficiency are improved. The use of isolated communication circuit design reduces signal interference and enhances system stability and reliability.

[0098] As an optional solution, in the above-mentioned electrical stimulation output open / short circuit protection circuit, Figure 7 This application provides a schematic diagram of a first communication circuit according to an embodiment; as shown below. Figure 7 As shown, the first communication circuit includes: the sixth switch Q6, the third optocoupler OP3, the eleventh resistor R11, the twelfth resistor R12, and the thirteenth resistor R13;

[0099] The control terminal of the sixth switch Q6 is connected to the first terminal of the eleventh resistor R11 and the data line port (TDIO1) of the download interface terminal J10. The second terminal of the sixth switch Q6 and the second terminal of the eleventh resistor R11 are grounded. The first terminal of the sixth switch Q6 is connected to the negative terminal of the third optocoupler OP3. The positive terminal of the third optocoupler OP3 is connected to the isolation positive power supply through the twelfth resistor R12. The collector of the third optocoupler OP3 is connected to the power supply through the thirteenth resistor R13. The emitter of the third optocoupler OP3 is grounded. The collector of the third optocoupler OP3 is connected to the timing input / output port (C_V1) of the controller 15.

[0100] The sixth switch, Q6, is used to control the transmission of communication signals. The third optocoupler, OP3, enables isolated signal transmission and improves anti-interference capability.

[0101] When the sampling processing module 13 sends a communication signal through the data line port of the download interface terminal J10, the control terminal of the sixth switch Q6 receives the signal. Depending on the high or low level of the signal, the sixth switch Q6 is turned on or off. When the sixth switch Q6 is turned on, the negative terminal of the third optocoupler OP3 is pulled low, and the third optocoupler OP3 starts working, transmitting the communication signal through optocoupler isolation to the timing input / output port of the controller 15. The collector of the third optocoupler OP3 outputs a communication signal, which is then transmitted to the controller 15 after current limiting by the thirteenth resistor R13, achieving reliable data transmission.

[0102] The timing input / output port (C_V1) of controller 15 refers to the timer pin of the controller.

[0103] The use of optocoupler isolation effectively suppresses electromagnetic interference during signal transmission, improving communication reliability. Current-limiting resistors protect the sixth switch Q6 and the third optocoupler OP3, extending component lifespan and enhancing circuit safety.

[0104] As an optional solution, in the above-mentioned electrical stimulation output open / short circuit protection circuit, Figure 8 This application provides a schematic diagram of a second communication circuit according to an embodiment; as shown below. Figure 8 As shown, the second communication circuit includes: the seventh switch Q7, the fourth optocoupler OP4, the fourteenth resistor R14, the fifteenth resistor R15, and the sixteenth resistor R16;

[0105] The control terminal of the seventh switch Q7 is connected to the first terminal of the fourteenth resistor R14 and the mode control port (mode control1) of the controller 15. The second terminal of the seventh switch Q7 and the second terminal of the fourteenth resistor R14 are grounded. The first terminal of the seventh switch Q7 is connected to the negative terminal of the fourth optocoupler OP4. The positive terminal of the fourth optocoupler OP4 is connected to the power supply through the fifteenth resistor R15. The collector of the fourth optocoupler OP4 is connected to the isolation positive power supply through the sixteenth resistor R16. The emitter of the fourth optocoupler OP4 is grounded. The collector of the fourth optocoupler OP4 is connected to the mode control port (mode control1') of the microcontroller unit U2.

[0106] The seventh switch, Q7, is used to control the transmission of communication signals. The fourth optocoupler, OP4, enables isolated signal transmission and improves anti-interference capability.

[0107] When controller 15 sends a communication signal through the mode control port, the control terminal of the seventh switch Q7 receives the signal. Depending on the high or low level of the signal, the seventh switch Q7 is turned on or off. When the seventh switch Q7 is on, the negative terminal of the fourth optocoupler OP4 is pulled low, and the fourth optocoupler OP4 begins operation, transmitting the communication signal to the mode control port of the microcontroller U2 via optocoupler isolation. The collector of the fourth optocoupler OP4 outputs a communication signal, which is then transmitted to the microcontroller U2 after current limiting by the sixteenth resistor R16, achieving reliable transmission of the control signal.

[0108] The controller can notify the microcontroller unit U2 of the acquisition mode via a level signal.

[0109] The optocoupler isolation design effectively suppresses electromagnetic interference during signal transmission, improving communication reliability. The current-limiting resistor protects the seventh switch Q7 and the fourth optocoupler OP4, extending the component lifespan and improving circuit safety.

[0110] As an optional solution, in the above-mentioned electrical stimulation output open / short circuit protection circuit, Figure 9 This is a schematic diagram of a power isolation circuit provided in an embodiment of this application; as shown Figure 9 As shown, it also includes: a power isolation circuit;

[0111] The input terminal of the power isolation circuit is connected to the power supply (+12V), and the output terminal of the power isolation battery includes an isolated negative power supply (-5V_P1) and an isolated positive power supply (5V_P1).

[0112] The power supply is connected to the power isolation circuit via its input terminal. The power isolation circuit uses internal isolation technology (such as transformer isolation or optocoupler isolation) to convert the input power supply into isolated positive and negative power outputs. (See attached diagram.) Figure 9 As shown, the 12V isolation is converted to positive and negative 5V.

[0113] The isolated positive power supply and isolated negative power supply are connected to different parts of the circuit to ensure that the power supply is completely isolated from the external power supply, avoiding interference and safety hazards.

[0114] To solve the above-mentioned technical problems, this application also provides an electrical stimulation therapy device, including the above-mentioned electrical stimulation output open / short circuit protection circuit.

[0115] The electrostimulation therapy device also includes other functional modules, such as the casing, battery, circuit board, touch screen and buttons, forming a complete therapy device structure.

[0116] The sampling control circuit 14 outputs a trigger signal when the PWM signal is high and remains silent when it is low. Upon receiving the trigger signal, the sampling processing module 13 immediately acquires current and voltage signals, performs calculations and judgments, and sends the results to the controller 15. The controller 15 executes corresponding protection operations based on the open / short circuit judgment results sent by the sampling processing module 13. The connection between the sampling control circuit 14 and the sampling processing module 13 enables precise control of the sampling timing, improves the real-time performance and accuracy of signal acquisition, ensures timely measures to protect patient safety in the event of an open circuit or short circuit, and reduces the risk of treatment interruption or failure due to circuit faults.

[0117] The above provides a detailed description of the electrical stimulation output open / short circuit protection circuit and electrical stimulation therapy device provided in this application. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0118] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. An open short protection circuit for an electrical stimulation output, characterized in that The application relates to a current acquisition circuit, a voltage acquisition circuit, a sampling processing module, a sampling control circuit and a controller. The current acquisition circuit and the voltage acquisition circuit are connected with an electric stimulation signal output circuit; the electric stimulation signal output circuit is connected with a PWM control end of the controller; the PWM control end of the controller is connected with an input end of the sampling control circuit; an output end of the sampling control circuit is connected with the sampling processing module; the sampling processing module is connected with output ends of the current acquisition circuit and the voltage acquisition circuit. The sampling control circuit receives a PWM signal and outputs a trigger signal at a high level; the sampling processing module acquires current signals and voltage signals sent by the current acquisition circuit and the voltage acquisition circuit when receiving the trigger signal; real-time resistance is obtained according to the current signals and the voltage signals; whether open circuit or short circuit occurs is judged according to a preset open circuit threshold and a preset short circuit threshold. The sampling processing module sends open circuit and short circuit to the controller. The sampling control circuit comprises a first switch tube, a first optocoupler, a second optocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor. A control end of the first switch tube is connected with the PWM control end of the controller and a first end of the first resistor; a second end of the first switch tube is connected with a second end and a grounding end of the first resistor; a first end of the first switch tube is connected with a negative electrode of the first optocoupler and a negative electrode of the second optocoupler; a positive electrode of the first optocoupler is connected with a power supply through the second resistor; a positive electrode of the second optocoupler is connected with the power supply through the fourth resistor; a collector of the first optocoupler is connected with an isolated positive power supply; a collector of the second optocoupler is connected with the isolated positive power supply through the fifth resistor; an emitter of the first optocoupler is connected with an isolated negative power supply through the third resistor; an emitter of the second optocoupler is grounded; the emitter of the first optocoupler is connected with control ends of the current acquisition circuit and the voltage acquisition circuit; the collector of the second optocoupler serves as an output end of the sampling control circuit. The current acquisition circuit comprises a second switch tube, a third switch tube, a first diode, a second diode, a first capacitor, a sixth resistor and a seventh resistor.

2. The electrical stimulation output open-short protection circuit of claim 1, wherein, A current sampling end of the electric stimulation signal output circuit is connected with a first end of the second switch tube; a second end of the second switch tube is connected with a first end of the third switch tube; a second end of the third switch tube is connected with a first end of the first capacitor, a first end of the seventh resistor, a negative electrode of the first diode and a positive electrode of the second diode through the sixth resistor; a second end of the first capacitor, a second end of the seventh resistor and a positive electrode of the first diode are grounded; a negative electrode of the second diode is connected with an isolated positive power supply; control ends of the second switch tube and the third switch tube are connected with an emitter of the first optocoupler; a second end of the sixth resistor serves as an output end of the current acquisition circuit and is connected with a current port of the sampling processing module. ​ 3. The electrical stimulation output open-short protection circuit of claim 2, wherein, The voltage acquisition circuit comprises a fourth switch tube, a fifth switch tube, a third diode, a fourth diode, a second capacitor, an eighth resistor and a ninth resistor; The current sampling end of the electric stimulation signal output circuit is connected with the first end of the fourth switch tube, the second end of the fourth switch tube is connected with the first end of the fifth switch tube, the second end of the fifth switch tube is connected with the first end of the second capacitor, the first end of the ninth resistor, the negative electrode of the third diode and the positive electrode of the fourth diode through the eighth resistor, the second end of the second capacitor, the second end of the ninth resistor and the positive electrode of the third diode are grounded, the negative electrode of the fourth diode is connected with an isolated positive power supply, the control ends of the fourth switch tube and the fifth switch tube are connected with the emitter of the first optocoupler, and the second end of the eighth resistor is connected with the voltage port of the sampling processing module as the output end of the voltage acquisition circuit.

4. The electrical stimulation output open-short protection circuit of claim 3, wherein, The sampling processing module comprises a micro control unit and a download interface terminal. The first input end of the micro control unit is connected with the output end of the sampling control circuit, the second input end of the micro control unit is connected with the output end of the current acquisition circuit, the third input end of the micro control unit is connected with the output end of the voltage acquisition circuit, the clock port of the micro control unit is connected with the clock port of the download interface terminal, and the data output end of the micro control unit is connected with the data line port of the download interface terminal.

5. The electrical stimulation output open-short protection circuit of claim 4, wherein, Further comprising: A communication transmission circuit, wherein the communication transmission circuit comprises a first communication circuit and a second communication circuit; The sampling processing module is connected with the controller through the first communication circuit and the second communication circuit; The first communication circuit generates output data of the sampling processing module to the controller; The second communication circuit generates output signals of the controller to the sampling processing module.

6. The electrical stimulation output open-short protection circuit of claim 5, wherein, The first communication circuit comprises a sixth switch tube, a third optocoupler, an eleventh resistor, a twelfth resistor and a thirteenth resistor; The control end of the sixth switch tube is connected with the first end of the eleventh resistor and the data line port of the download interface terminal, the second end of the sixth switch tube and the second end of the eleventh resistor are grounded, the first end of the sixth switch tube is connected with the negative electrode of the third optocoupler, the positive electrode of the third optocoupler is connected with an isolated positive power supply through the twelfth resistor, the collector of the third optocoupler is connected with a power supply through the thirteenth resistor, the emitter of the third optocoupler is grounded, and the collector of the third optocoupler is connected with the timing input and output port of the controller.

7. The electrical stimulation output open-short protection circuit of claim 5, wherein, The second communication circuit comprises a seventh switch tube, a fourth optocoupler, a fourteenth resistor, a fifteenth resistor and a sixteenth resistor; The control end of the seventh switch tube is connected with the first end of the fourteenth resistor and the mode control port of the controller, the second end of the seventh switch tube and the second end of the fourteenth resistor are grounded; the first end of the seventh switch tube is connected with the negative electrode of the fourth optocoupler, the positive electrode of the fourth optocoupler is connected with the power supply through the fifteenth resistor, the collector of the fourth optocoupler is connected with the isolated positive power supply through the sixteenth resistor, the emitter of the fourth optocoupler is grounded, and the collector of the fourth optocoupler is connected with the mode control port of the micro control unit.

8. The electrical stimulation output open-short protection circuit of claim 1, wherein, Further comprising: a power supply isolation circuit; the input end of the power supply isolation circuit is connected with the power supply, and the output end of the power supply isolation circuit includes an isolated negative power supply and an isolated positive power supply.

9. An electro-stimulation therapy device, characterized by, The electric stimulation output short circuit protection circuit comprises the power supply isolation circuit.

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