Radio frequency control system with adjustable output frequency and output power

Abstract

The utility model relates to a radio frequency control system with adjustable output frequency and output power. The radio frequency control system comprises a control module, an inversion module, a resonance module and a transformer, the control module controls the inversion module; the output of the inversion module is connected in series with the resonance module and then is connected with the primary of the transformer; the secondary output of the transformer is fed back to the control module through the voltage sampling module and the current sampling module. The resonance module comprises a plurality of resonance circuits which are connected in parallel; each resonance circuit is controlled by an electronic switch to be connected between the inversion module and the transformer or not; and the control module controls the on-off of the electronic switch. The radio frequency control system with adjustable output frequency and output power provided by the utility model can effectively meet the requirements of different output frequencies of different energy platforms, and one device can meet the requirements of various output frequencies.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to a radio frequency control system with adjustable output frequency and output power Background Technique

[0002] The radio frequency ablation host generates radio frequency current, and this current forms a loop through body tissues between the tip of the working electrode placed at the affected area and the dispersive electrode placed at other parts. The radio frequency current passes through the tissue, generating a continuously changing electric field. The electric field exerts a force on the electrolyte ions in the tissue, causing them to move back and forth at a very high speed. The friction and impact of the ion flow in the tissue generate heat, which is manifested as a thermal effect in the tissue

[0003] The thermal sink effect of the surrounding tissue reduces the damage to the surrounding tissue including blood vessels, that is, the self-limitation of the damage, and reduces the occurrence of complications. It is convenient to operate, has a short hospital stay, definite curative effect, and good controllability of the ablation range, and is especially suitable for patients with advanced age, combined with other diseases, severe liver cirrhosis, tumors located deep in the liver or central liver cancer

[0004] Based on the above advantages, radio frequency ablation is widely used in the field of clinical medicine. During the operation, how to perform high-precision and high-stability radio frequency energy control is an important difficulty in clinical applications. The control of radio frequency energy is reflected in that when the impedance at the load end changes, it is necessary to respond in a timely manner and accurately adjust the output frequency and output power Summary of the Invention

[0005] The technical problem to be solved by the utility model is: to overcome the above-mentioned technical disadvantages, and in view of the different output frequencies and powers of different energy platforms, a power control system compatible with multiple frequencies is proposed

[0006] In order to solve the above technical problem, the technical solution proposed by the utility model is: a radio frequency control system with adjustable output frequency and output power, including: a control module, an inverter module, a resonance module, and a transformer; the control module controls the inverter module; the output of the inverter module is connected in series with the resonance module and then connected to the primary of the transformer; the output of the secondary of the transformer is respectively fed back to the control module through a voltage sampling module and a current sampling module; the resonance module includes a plurality of parallel resonance circuits; each resonance circuit is controlled by an electronic switch to determine whether to be connected between the inverter module and the transformer; the control module controls the on and off of the electronic switch

[0007] The further improvement of the above solution is: it further includes a power supply module; the input of the power supply module is connected to external power supply, and after half-bridge conversion, rectification, and filtering, it is output to the inverter module

[0008] A further improvement of the above solution is that: the power supply module includes a resistance sampling circuit for detecting the output voltage and a current transformer for sampling the output current; the outputs of the resistance sampling circuit and the current transformer are fed back to the control chip of the power supply module.

[0009] The radio frequency control system with adjustable output frequency and output power provided by the present utility model can effectively solve the requirements for different output frequencies of different energy platforms, and one device can meet the requirements of multiple output frequencies. Brief Description of the Drawings

[0010] The present utility model will be further described below with reference to the drawings.

[0011] Figure 1 It is a schematic structural diagram of a preferred embodiment of the present utility model.

[0012] Figure 2 It is a circuit diagram of the sampling part in the power supply module of a preferred embodiment of the present utility model.

[0013] Figure 3 It is a circuit diagram of the half-bridge, rectification and filtering in the power supply module of a preferred embodiment of the present utility model.

[0014] Figure 4 It is a circuit diagram of the control module of a preferred embodiment of the present utility model.

[0015] Figure 5 It is a circuit diagram of the full-bridge inverter of a preferred embodiment of the present utility model.

[0016] Figure 6 It is a circuit diagram of the resonance module of a preferred embodiment of the present utility model. Detailed Description of the Preferred Embodiment

[0017] The radio frequency control system with adjustable output frequency and output power in this embodiment is arranged on a circuit board as shown in Figure 1 and is isolated according to functions, divided into a power supply board and a control board.

[0018] The power supply board is used to arrange the power supply module; the input of the power supply module is connected to the external power supply, and after half-bridge conversion, rectification and filtering, it is output to the full-bridge inverter.

[0019] As shown in Figure 2 , it is a circuit diagram of the sampling part in the power supply module. U1 is the control chip, R21, R22, R24, R63 and U3B form the output voltage detection, U4A is the main chip for output current detection, and L1 is the current transformer (current sampling).

[0020] As shown in Figure 3As shown in the figure, it is the circuit diagram of half-bridge, rectification and filtering in the power supply module. Q1 and Q2 form a half-bridge circuit; D2, D3, D5, and D6 are rectifier bridges; L1 and C10 are filtering modules; R17 is a current sampling resistor.

[0021] The power supply module controls the voltage on the primary side of the transformer by adjusting the duty cycle of the half-bridge, and then controls the voltage on the secondary side. After rectification by diodes, it is filtered, and the output voltage is used as the power supply for the control board. The output voltage is divided and compared with the control signal to accurately control the output voltage value; the signal on the primary side of the transformer is collected by a current transformer to input the current signal into the control chip to monitor the current, realizing accurate control and protection; the output signal monitors the current through the sampling resistor and inputs it into the control for protection.

[0022] The control board is arranged with a control module, a full-bridge inverter, a resonant module and a transformer; the control module controls the full-bridge inverter; the output of the full-bridge inverter is connected to the primary of the transformer after being connected in series with the resonant module; the outputs of the secondary of the transformer are respectively fed back to the control module through voltage sampling and current sampling; the resonant module includes several parallel resonant circuits; whether each resonant circuit is connected between the full-bridge inverter and the transformer is controlled by a relay; the control module controls the on and off of the relay.

[0023] The control board controls the full-bridge inverter, and after frequency selection by the resonant module, it outputs a radio frequency signal through the transformer. The output radio frequency signal will monitor the output power in real time through voltage and current sampling. When the parameters are abnormal, the output will be stopped immediately. The voltage and current sampling, after passing through a precision rectifier circuit, are converted into digital signals through an ADC and communicate with the single-chip microcomputer. If there are multiple outputs, each output needs to sample the current to monitor the power and turn off the output in time when an abnormality occurs.

[0024] As Figure 4 shown, it is the circuit diagram of the control module, which consists of U1, U2, U3, U4 and T1, T2 to form a full-bridge drive.

[0025] As Figure 5 shown, it is the circuit diagram of the full-bridge inverter, which consists of Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8 to form a full-bridge inverter.

[0026] As Figure 6 shown, it is the circuit diagram of the resonant module. Different LC oscillations are switched through the relay K19, so that the resonant frequencies connected to the circuit are different.

[0027] The radio frequency control system with adjustable output frequency and output power provided by the present invention can effectively solve the requirements for different output frequencies of different energy platforms, and one device can meet the requirements of multiple output frequencies.

[0028] The present utility model is not limited to the above embodiments. Any technical solution formed by equivalent replacement falls within the protection scope claimed by the present utility model.

Claims

1. A radio frequency control system with adjustable output frequency and output power, characterized in that: It includes: a control module, an inverter module, a resonance module and a transformer; the control module controls the inverter module; The output of the inverter module is connected in series with the resonance module and then connected to the primary of the transformer; the output of the secondary of the transformer is fed back to the control module through the voltage sampling module and the current sampling module respectively; the resonance module includes a plurality of parallel resonance circuits; each resonance circuit is controlled by an electronic switch whether to be connected between the inverter module and the transformer; the control module controls the on and off of the electronic switch.

2. The radio frequency control system with adjustable output frequency and output power according to claim 1, characterized in that: It also includes a power supply module; the input of the power supply module is connected to the external power supply, and is output to the inverter module after half-bridge conversion, rectification and filtering.

3. The radio frequency control system with adjustable output frequency and output power according to claim 2, characterized in that: The power module comprises a resistance sampling circuit for detecting the output voltage and a current transformer for sampling the output current; the outputs of the resistance sampling circuit and the current transformer are fed back to the control chip of the power module.

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