A current balancing device and an interferential electrotherapy apparatus

Abstract

The application discloses a current balancing device and an interference electric therapeutic instrument, and relates to the field of current stabilization. A processor acquires output impedances of each output transformer in the interference electric therapeutic instrument, and controls output of the output transformers according to the output impedances of the output transformers and preset output currents required by the output transformers to output. Since the resistance values of different human body skin surfaces are different, the output impedances of the corresponding output transformers are different. By acquiring the actual output impedances of the output transformers, the output voltages of the output transformers are changed according to the output impedances of the output transformers and the preset output currents required by the output transformers to output, so that the current value input into the human body is the value of the preset output current required by the output transformers to output, and the user can avoid uncomfortable feeling caused by too large current difference. In addition, an operational amplifier feedback circuit does not need to be arranged, high power consumption and high heat caused by the operational amplifier feedback circuit are avoided, and long-term stable work of the interference electric therapeutic instrument is ensured.

Claims

1. A current balancing device, characterized in that, include: Memory, used to store computer programs; A processor, when executing the computer program, performs the following steps: Obtain the output impedance of each output transformer in the interferential electrotherapy device; The output voltage of each output transformer is controlled according to the output impedance of each output transformer and the preset output current of each output transformer; Wherein, the output voltage = the product of the output impedance and the output current; Also includes: A first switch and a sampling resistor corresponding to each of the output transformers are connected in series between the output transformer corresponding to each of the first switches and the processor. The processor is further configured to determine a first time difference between the current moment and the next peak moment of the voltage waveform of each of the output transformers, and control the first switch corresponding to the output transformer whose first time difference is equal to the first preset time difference to be disconnected after a first preset time period at the current moment. A first capacitor corresponding to each of the output transformers is disposed between the sampling resistor corresponding to the first capacitor and the processor. An induction transformer, corresponding one-to-one with each of the aforementioned output transformers, is used to collect the induced voltage of the output transformer corresponding one-to-one with itself using the principle of electromagnetic induction. The processor is also used for: Obtain the induced voltage collected by each of the aforementioned induction transformers; The ratio between the value of each induced voltage and the amplification factor of the induced transformer corresponding to each induced voltage is determined as the output current of the output transformer corresponding to each induced transformer. A second switch corresponding to each of the aforementioned inductive transformers is disposed between the inductive transformer corresponding to the second switch and the processor. The processor is further configured to determine a second time difference between the current moment and the next peak moment of the voltage waveform of each of the induction transformers, and control the second switch corresponding to the induction transformer whose second time difference is equal to a second preset time difference to be disconnected after a second preset time period has elapsed at the current moment.

2. The current balancing device as described in claim 1, characterized in that, Obtain the output impedance of each output transformer in the interferential current therapy device, including: Obtain the output voltage and output current of each of the output transformers; The output impedance of each output transformer is determined based on the output voltage and output current of each output transformer.

3. The current balancing device as described in claim 2, characterized in that, Obtaining the output voltage of each of the output transformers includes: Obtain N first peak voltages for each of the output transformers, where N is an integer not less than 3; For any of the output transformers, remove the largest and smallest first peak voltages from the N first peak voltages; For any one of the output transformers, the average voltage between the remaining N-2 first peak voltages is determined as the output voltage of the output transformer.

4. The current balancing device as described in claim 1, characterized in that, The induced voltage collected by each of the aforementioned induction transformers includes: Obtain M second peak voltages collected by each of the aforementioned induction transformers, where M is an integer not less than 3; For any of the aforementioned induction transformers, remove the second peak voltage with the largest value and the second peak voltage with the smallest value from among the M second peak voltages; For any one of the induction transformers, the average voltage between the remaining M-2 second peak voltages is determined as the induced voltage of the induction transformer.

5. The current balancing device as described in claim 1, characterized in that, Also includes: A second capacitor corresponding to each of the aforementioned inductive transformers is disposed between the inductive transformer corresponding to the second capacitor and the processor.

6. The current balancing device according to any one of claims 1 to 5, characterized in that, The processor is specifically used for: Determine the preset impedance coefficient corresponding to the impedance range in which the output impedance of each of the output transformers is located; Determine the current output level corresponding to the preset output current of each of the output transformers; The voltage output strength of each output transformer is determined based on the preset impedance coefficient and the current output level of each output transformer. The output voltage of each output transformer is controlled according to the voltage output strength of each output transformer.

7. An interferential electrotherapy device, characterized in that, The device includes the main body of the electrotherapy device and the current balancing device as described in any one of claims 1 to 6; The main body of the interferential electrotherapy device is connected to the current balancing device.

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