CN216956799U - Radio frequency ablation equipment and constant power control circuit thereof - Google Patents
Radio frequency ablation equipment and constant power control circuit thereof Download PDFInfo
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- CN216956799U CN216956799U CN202123396565.0U CN202123396565U CN216956799U CN 216956799 U CN216956799 U CN 216956799U CN 202123396565 U CN202123396565 U CN 202123396565U CN 216956799 U CN216956799 U CN 216956799U
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Abstract
The utility model provides radio frequency ablation equipment and a constant power control circuit thereof, wherein the radio frequency ablation equipment comprises an impedance detection circuit, an open square operation circuit, a power voltage output circuit and an analog operation circuit; the impedance detection circuit is connected with the squaring operation circuit; the voltage of the impedance detection voltage can represent the impedance of the impedance to be detected; the power voltage output circuit is connected with the analog operation circuit to output power feedback voltage to the analog operation circuit, and the power feedback voltage is related to the target output power of a power supply unit of the radio frequency ablation device; the analog operation circuit is connected with a control end of a power supply unit of the radio frequency generation circuit so as to feed back a voltage control signal of the power supply unit to indicate the power supply unit to output a current power supply, and the voltage of the current power supply is matched with the voltage control signal.
Description
Technical Field
The utility model relates to the field of radio frequency ablation, in particular to radio frequency ablation equipment and a constant power control circuit thereof.
Background
The radio frequency ablation technology is an accurate minimally invasive operation which precisely punctures radio frequency energy to a tumor target area to implement a minimally invasive ablation under the guidance of an image.
The change of impedance causes that the voltage output to the two ends of the load needs to be adjusted to stabilize the power, the output voltage of the power supply unit is controlled by software in the prior art, firstly, the information of the impedance change needs to be acquired by hardware and is sent to an MCU (micro control unit), and the MCU performs necessary operation according to the change of the impedance and then sends the information of the output voltage change of the power supply unit to realize the output of constant power.
Obviously, in the process, the operation process is completely integrated in the MCU, however, as the rf ablation process becomes complicated, the MCU will also be configured with more and more functions, and the MCU is overloaded, and at this time, if the task of constant power control is completely applied to the MCU, the processing efficiency of the MCU will be reduced, and correspondingly, the response speed of the constant power control will be slowed down.
SUMMERY OF THE UTILITY MODEL
The utility model provides radio frequency ablation equipment and a constant power control circuit thereof, which aim to solve the problem that the response speed of constant power control becomes slow.
According to a first aspect of the present invention, a constant power control circuit of a radio frequency ablation apparatus is provided, which includes an impedance detection circuit, an open-square operation circuit, a power voltage output circuit, and an analog operation circuit;
the impedance detection circuit is connected with the squaring operation circuit and is used for detecting the impedance of the impedance to be detected to obtain impedance detection voltage and feeding back the impedance detection voltage to the squaring operation circuit; the voltage of the impedance detection voltage can represent the impedance of the impedance to be detected;
the power-on operation circuit is used for power-on of the impedance detection voltage to obtain a power-on voltage, and the power-on operation circuit is connected with the analog operation circuit to feed the power-on voltage back to the analog operation circuit;
the power voltage output circuit is connected with the analog operation circuit to output power feedback voltage to the analog operation circuit, and the power feedback voltage is related to the target output power of a power supply unit of the radio frequency ablation device;
the analog operation circuit is connected with a control end of a power supply unit of the radio frequency generation circuit so as to feed back a voltage control signal of the power supply unit to indicate the power supply unit to output a current power supply to the radio frequency generation unit, and the voltage of the current power supply is matched with the voltage control signal.
Optionally, the power voltage output circuit includes a control circuit and a digital-to-analog conversion circuit;
the control circuit is connected with the digital-to-analog conversion circuit to send a digital signal to the digital-to-analog conversion circuit; the digital signal is related to the target output power of a power supply unit in the radio frequency ablation device;
the digital-to-analog conversion circuit is used for converting the digital signal into an analog signal to obtain a power feedback voltage related to the target output power, and the digital-to-analog conversion circuit is connected with the analog operation circuit to feed the power feedback voltage back to the analog operation circuit.
Optionally, the power voltage output circuit comprises a voltage generator for generating the power feedback voltage.
Optionally, the impedance detection circuit includes: the device comprises a current detection circuit, a voltage detection circuit, an analog divider and a voltage output circuit;
the current detection circuit is connected in series with the impedance to be detected;
the feedback end of the current detection circuit is connected with the analog divider so as to feed back current feedback voltage to the analog divider, and the voltage of the current feedback voltage can represent the current of the impedance to be detected;
the voltage detection circuit is connected with the impedance to be detected in parallel, the feedback end of the voltage detection circuit is also connected with the analog divider so as to feed back voltage to the analog divider, and the voltage of the voltage feedback voltage can represent the voltage of the impedance to be detected;
and the output end of the analog divider is used for directly or indirectly outputting the impedance detection voltage.
Optionally, the analog divider is an analog proportional divider.
Optionally, the analog divider includes: a first inverting sub-circuit and a dividing sub-circuit;
the first inverting sub-circuit comprises a first resistor, a second resistor and a first amplifier, and the dividing sub-circuit comprises a third resistor, a fourth resistor, a second amplifier and a first chip;
the first end of the first amplifier is connected with the first end of the first resistor, the second end of the first amplifier is grounded, the second end of the first resistor is connected with the voltage detection circuit, the first end of the first resistor is also connected with the first end of the second resistor, the second end of the second resistor is connected with the third end of the first amplifier, the third end of the first amplifier is also connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the second amplifier, the second end of the second amplifier is grounded, the second end of the third resistor is also connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the first end of the first chip, the second end of the first chip is connected with the current detection circuit, and the third end of the first chip is connected with the third end of the second amplifier, and the third end of the second amplifier is connected with the voltage output circuit.
Optionally, the squaring circuit includes: a second inverting sub-circuit and a square root sub-circuit;
the second inverter sub-circuit comprises a fifth resistor, a sixth resistor and a third amplifier, and the square root sub-circuit comprises a seventh resistor, an eighth resistor, a fourth amplifier and a second chip;
a first end of the fifth resistor is connected with the impedance detection circuit, a second end of the fifth resistor is connected with a first end of the third amplifier, the second end of the third amplifier is grounded, the second end of the fifth resistor is also connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the third end of the third amplifier, the third end of the third amplifier is also connected with the first end of the seventh resistor, a second end of the seventh resistor is connected to a first end of the fourth amplifier, a second end of the fourth amplifier is grounded, the second end of the seventh resistor is also connected with the first end of the eighth resistor, the second end of the eighth resistor is connected with the second chip, and the second end of the second chip and the third end of the second chip are connected with the third end of the fourth amplifier, and the third end of the fourth amplifier is connected with the analog operation circuit.
Optionally, the analog operation module includes an analog proportional multiplier,
the analog proportional multiplier is used for multiplying the square operation voltage, the power feedback voltage and a specified coefficient to obtain the voltage control signal.
Optionally, the control circuit comprises a micro control unit.
According to a second aspect of the present invention there is provided a radio frequency ablation device comprising the constant power control circuit of the radio frequency ablation device of the first aspect and its alternatives.
According to the radio frequency ablation equipment and the constant power control circuit thereof, the power feedback voltage related to the target output power can be obtained through the power voltage output circuit, and meanwhile, the voltage after power evolution can be obtained through the impedance detection circuit and the evolution operation circuit; furthermore, based on the power feedback voltage and the voltage after the power is cut off, a sufficient hardware basis can be provided for the supply of the voltage control signal required by the constant power. In the process of forming the voltage control signal, only the power voltage output circuit is needed to provide the power feedback voltage related to the target output power, and under the condition of constant power, the power feedback voltage is fixed, and in the working process, the control circuit (such as the MCU) does not need to perform a specific operation process (at most, a digital signal corresponding to the power feedback voltage is provided, or the control circuit is not used at all), so that the burden of the control circuit (such as the MCU) is greatly reduced, further, the influence on the response speed of the constant power control caused by the excessive burden of the control circuit (such as the MCU) can be avoided.
Wherein, because the required output power of present power that the power supply unit output is target output power, then there is: p is U2/R；
Wherein:
p indicates the target output power;
u refers to the voltage required to be output by the current power supply;
r refers to the impedance of the impedance to be measured;
and further:
based on the connection relationship between the power voltage output circuit and the analog operation circuit, the analog operation circuit can obtain the power feedback voltage U1 associated with the target output power, and the association is characterized as follows: u1 ═ f (p), i.e.: p ═ f-1(U1)；
Detecting the voltage U due to the impedanceRThe voltage can represent the impedance of the impedance to be measured, and then: u shapeRG (R), i.e. R ═ g-1(UR) (ii) a Furthermore, according to the common sense in the art of detecting impedance and using analog quantity (i.e. voltage magnitude) to characterize impedance, R and URGenerally in a linear relationship (or a relationship similar to linear);
meanwhile, the output voltage of the power supply unit and the voltage V of the voltage control signal received by the power supply unitOIt is generally satisfied that: u ═ h (V)O) (ii) a E.g. VOIs in direct proportion to U;
then there is f-1(U1)＝(h(VO))2/g-1(UR)；
On the basis of the above-mentioned technical scheme,
and because R and URIn a linear relationship, therefore, for g-1(UR) Must contain URThe square result of (1), so, when URAfter the square-off result of (b) U1 is determined, Vo (voltage of the voltage control signal directed to the target output power) can be uniquely determined naturally. Based on the hardware of the utility model, the constant power control of the target output power of the power supply unit can be realized.
In addition, the specific scheme of the utility model can also play a positive role in maintaining the stability of the radio frequency output power and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a first schematic diagram of a constant power control circuit of an rf ablation device in accordance with an embodiment of the present invention;
fig. 2 is a schematic diagram of a constant power control circuit of the rf ablation device in accordance with an embodiment of the present invention;
fig. 3 is a schematic diagram of a constant power control circuit of the rf ablation apparatus according to an embodiment of the present invention;
fig. 4 is a fourth schematic diagram of the constant power control circuit of the rf ablation device in an embodiment of the present invention;
FIG. 5 is a schematic diagram of the calculation principle in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
The utility model provides a constant power control circuit of radio frequency ablation equipment, which can be used for carrying out constant power control on an output electric signal of a power supply unit in the radio frequency ablation equipment; in the rf ablation apparatus, the power supply unit may be connected to the rf generation unit to provide a current power supply (e.g., a current power supply of constant power) to the rf generation unit, and the rf generation unit may generate an rf signal based on the current power supply and then output the rf signal to the impedance to be measured.
Referring to fig. 1, the constant power control circuit of the rf ablation apparatus may include an impedance detection circuit 1, an open-square operation circuit 2, a power voltage output circuit, and an analog operation circuit 5;
the impedance detection circuit 1 is connected to the squaring circuit 2,
the impedance detection circuit 1 is used for detecting the impedance of the impedance to be detected to obtain an impedance detection voltage, and feeding back the impedance detection voltage to the squaring operation circuit; the voltage of the impedance detection voltage can represent the impedance of the impedance to be detected;
the squaring operation circuit 2 is used for squaring the impedance detection voltage to obtain a square-squared voltage, and the squaring operation circuit is connected with the analog operation circuit so as to feed the square-squared voltage back to the analog operation circuit;
the power voltage output circuit is connected with the analog operation circuit so as to output a power feedback voltage to the analog operation circuit, wherein the power feedback voltage is related to the target output power of a power supply unit of the radio frequency ablation equipment;
in one example, as shown in fig. 1, the power voltage output circuit includes a control circuit and a digital-to-analog conversion circuit; the control circuit 3 is connected with the digital-to-analog conversion circuit 4 to send a digital signal to the digital-to-analog conversion circuit, that is, the control circuit 3 is used for outputting a digital signal related to the target output power of the radiofrequency ablation device and sending the digital signal to the digital-to-analog conversion circuit;
the digital-to-analog conversion circuit 4 is configured to convert the digital signal into an analog signal to obtain a power feedback voltage associated with the target output power, and the digital-to-analog conversion circuit 4 is connected to the analog operation circuit 5 to feed back the power feedback voltage to the analog operation circuit;
the digital signal is related to the target output power of a power supply unit in the radio frequency ablation device; the digital signal can be calibrated in advance according to requirements;
for example: due to the fact that
Therefore, the digital signal can be scaled as: the square of the power feedback voltage is in direct proportion to the target output power; namely: the digital signal may be configured to obtain a power feedback voltage that is proportional to the square root result of the value of the target output power after digital-to-analog conversion, for example, by combining a conversion manner of digital-to-analog conversion performed by the digital-to-analog conversion circuit: p ═ f-1(U1)＝6.25U12(this function is a typical function).
It can be seen that, since the digital signal does not need to be calculated after being calibrated or specified, the control circuit (i.e., MCU) does not need to participate in the calculation in the process of calculating the power feedback voltage according to the embodiment of the present invention, and the present invention does not rely on a software program to implement the calculation process.
In another example, since the target output power under the constant power control may be fixed, the voltage generator may be configured to directly generate the power feedback voltage, that is: the power voltage output circuit includes a voltage generator for generating the power feedback voltage.
In this example, the voltage value of the power feedback voltage output by the voltage generator may be fixed, and in another example, the voltage value of the power feedback voltage output by the voltage generator may be adjustable (for example, adjustable by a control circuit, or manually). The configuration result of the voltage generator can also satisfy the condition that P ═ f-1(U1), for example: p ═ f-1(U1)＝6.25U12(this function is a typical function).
The analog operation circuit 5 is connected with a control end of a power supply unit 6 of the radio frequency generation circuit so as to feed back a voltage control signal of the power supply unit to indicate the power supply unit to output a current power supply, wherein the voltage of the current power supply is matched with the voltage control signal;
in one example, the analog operation module includes an analog proportional multiplier,
and the analog proportional multiplier is used for multiplying the voltage after power division, the power feedback voltage and a specified coefficient to obtain the voltage control signal.
In one example, as mentioned above, the power formula is: p is U2/R；
The control formula of the power supply unit is, for example, U ═ h (V)O)＝K*VOU is the output voltage of the power supply unit, K is the scaling factor (determined by the characteristics of the power supply unit, K is 39 in one embodiment), and V isOFor controlling the pin (I.e. the control terminal of the power supply unit), i.e. the voltage of the voltage control signal;
the impedance detection circuit has a conversion formula of, for example, UR＝g(R)＝KR*R，KRIs a scaling factor, which is a specific value, dependent on the circuit design (specifically, the operation scale of the circuit is determined, in one embodiment, KR＝1/280)；
From the relationship between the above equations, we obtain: p is U2/R＝(K*VO)2/(UR/KR) After transformation to obtain
Because of K, KRIs a proportionality coefficient, so VOIs proportional to
P and U12In the case of direct ratio, then VOProportional to U1,
At this time, the analog operation circuit can obtain V by using the multiplierO。
In one example, the control circuit includes a micro control unit (i.e., MCU), and can also be implemented by a single chip microcomputer;
the MCU generates a digital signal of target output power required to be output, the digital-to-analog conversion circuit converts the digital signal into analog voltage, and the functional relation P-f (U) is satisfied1) If the design is as follows: p is 6.25U1 2And the D/A conversion circuit outputs U1，U1Is controlled by the MCU and is given by the formula P6.25U1 2Determining that a functional relation exists between the P value and the P value; once the power P value is determined, U1Will determine that even if R changes, U1There is no change in the value of (c).
Therefore, the purpose that when the power is constant, the power is stabilized and adjusted completely by hardware is achieved, the software operation process is reduced, the flow is simplified, and the response speed is improved.
It can be seen that in the above example, for P ═ f-1(U1) forming P and U12Linear relationship between R and g-1(UR) Form R and URThe linear relationship of (a); for U ═ h (V)O) A linear relationship of U and Vo is formed. In other examples, the formation of a linear relationship between P and U1 is not excluded.
Referring to fig. 2, the impedance detection circuit includes: the device comprises a current detection circuit 11, a voltage detection circuit 12 and an analog divider 13, wherein the analog divider 13 can be connected with a voltage output circuit 14 or directly connected with an analog operation circuit;
the current detection circuit 11 is connected in series with the impedance R to be detected;
the feedback end of the current detection circuit 11 is connected to the analog divider 13 to feed back a current feedback voltage to the analog divider 13, and the voltage of the current feedback voltage can represent the current of the impedance to be detected;
the voltage detection circuit 12 is connected in parallel with the impedance to be detected, the feedback end of the voltage detection circuit 12 is further connected with the analog divider 13 so as to feed back voltage to the analog divider, and the voltage of the voltage feedback voltage can represent the voltage of the impedance to be detected;
the output end of the analog divider is directly or indirectly connected with the squaring operation circuit; for directly or indirectly outputting the impedance detection voltage; for example, the analog divider may output the impedance detection voltage directly or an intermediate voltage, and further output the impedance detection voltage through the adjustment (e.g., boosting, dropping, rectifying, amplifying, etc.) of the voltage output circuit 14
The current detection circuit may be characterized as being for detecting a voltage characterized by a current flowing through the impedance to be measured;
the voltage detection circuit may be characterized as a voltage for detecting the impedance to be detected;
the analog divider may be characterized as an operator for dividing the voltage feedback voltage and the current feedback voltage;
the working process can be as follows: the current detection circuit detects the current of the impedance to be detected so as to obtain current feedback voltage representing the current, the voltage detection circuit detects the voltage of the impedance to be detected so as to obtain voltage feedback voltage representing the voltage, and the current feedback voltage and the voltage feedback voltage are sent to the analog divider to be subjected to division operation, so that the impedance feedback voltage is directly or indirectly obtained.
Referring to fig. 3, the analog divider includes: a first inverter sub-circuit 131 and a divider sub-circuit 132;
in one example, the analog divider comprises an analog proportional divider, and the output voltage of the analog divider is URSatisfy UR＝(UV/UI)，UVFor voltage detection of the output voltage (i.e. voltage feedback voltage), UIFor the voltage output by the current detection (i.e. the current feedback voltage), the impedance R to be detected may be a human body in one embodiment.
Referring to fig. 3, the first inverting sub-circuit 131 includes a first resistor R1A second resistor R2The first amplifier 1311, the dividing sub-circuit 132 includes a third resistor R3A fourth resistor R4A second amplifier 1321 and a first chip 1322;
the first terminal of the first amplifier 1311 is connected to the first resistor R1The second terminal of the first amplifier 1311 is grounded, and the first resistor R1The second end of the first resistor is connected with the voltage detection circuit, and the first resistor R1Is also connected to the second resistor R2The first terminal of (2), the second resistor R2Is connected to the third terminal of the first amplifier 1311, and the third terminal of the first amplifier 1311 is further connected to the third resistor R3The first terminal of (2), the third resistor R3Is connected to a first terminal of the second amplifier 1321, a second terminal of the second amplifier 1321 is connected to ground, and the third resistor R3Is also connected with the fourth resistor R4The first terminal of (1), the fourth resistor R4A second terminal of the first chip 1322 is connected to the first terminal of the first chip 1322, a second terminal of the first chip 1322 is connected to the current detection circuit, a third terminal of the first chip 1322 is connected to a third terminal of the second amplifier 1321, and a third terminal of the second amplifier 1321 is connected to the voltage output circuit.
In one embodiment, the first chip is an analog multiplier, which operates, for example: u shapeIAnd URThe voltage at the output end of the first chip is k × U through the first chipI*URDue to the passage of R3And R4Are equal to obtain the formula UV/R3＝k*UI*UR/R4Is transformed to obtain UR＝UV*R4/R3*UIK, and then obtaining the UR＝UV/UI。
Referring to fig. 4, the squaring circuit 2 includes: a second inverter sub-circuit 21 and a square root sub-circuit 22;
the second inverting sub-circuit 21 comprises a fifth resistor R5A sixth resistor R6The third amplifier 211, the square root sub-circuit 22 comprise a seventh resistor R7An eighth resistor R8A fourth amplifier 221 and a second chip 222;
the fifth resistor R5Is connected to the impedance detection circuit, the fifth resistor R5Is connected to a first terminal of the third amplifier 211, a second terminal of the third amplifier 211 is grounded, and the fifth resistor R5Is also connected with the sixth resistor R6The first end of (2), the sixth resistor R6Is connected to a third terminal of the third amplifier 211, the third terminal of the third amplifier 211 is further connected to the seventh resistor R7The first end of (2), the seventh resistor R7Is connected to a first terminal of the fourth amplifier 221, a second terminal of the fourth amplifier 221 is grounded, and the seventh resistor R7Is also connected with the eighth resistor R8The eighth resistor R, the eighth resistor R8A second terminal of the second chip 222 and a third terminal of the second chip 222 are connected to a third terminal of the fourth amplifier 221, and a third terminal of the fourth amplifier 221 is connected to the analog operation circuit;
in one embodiment, the operation process may be, for example: the squaring operation circuit realizes UR(impedance detection voltage) to
Is transformed, i.e.
Wherein R is5＝R6,R7＝R8，
In a specific embodiment, if the square root circuit is only used as the square root circuit, the output voltage formula is
Where k is a scaling factor, this formula represents only UR<When 0, the square root operation can be realized; when U is turnedR>At 0, then U2Whether the voltage is positive or negative, the output voltage of the second chip is positive, so that the feedback of the operation is positive and the normal operation cannot be realized; the voltage U at the point A in FIG. 4 can be further obtained by using a second inverter sub-circuitA＝-URFinally, the square root circuit is passed to make the output
Referring to fig. 5, the analog operation module includes an analog scale multiplier,
the analog proportional multiplier is used for multiplying the square operation voltage, the power feedback voltage and a specified coefficient to obtain the voltage control signal;
in one example, the analog proportional multiplier satisfies VO＝J*U2*U1J is a fixed value, U, calculated from2Is composed of
U1And with
The linear relation is formed, and the fixed value J must be met when a hardware circuit is designed; one example, J ═ 1.077, V obtainedOThe voltage is output to a power supply unit, and the output voltage is finally controlled;
further, VOThe calculation process of (c) may be as follows: from the formula U-K VO、P＝6.25U1 2And UR＝KRR, 6.25U was obtained1 2＝U2/R＝K2VO 2/R＝K2VO 2KR/URAfter simplification, obtain
In the formula KRAnd K is a scaling factor, which is a known value, depending on circuit design, in one example, KR1/280, K39, then
Wherein U is1Is an analog voltage, U, controlled by an MCU (i.e. control circuit)RIs the voltage obtained by collecting the impedance R,
is a value obtained by an evolution operation (i.e. U)2)，VOIs the voltage output to the control pin of the power supply unit for controlling the output voltage of the power supply unit.
In summary, in the embodiments of the present invention, the following positive effects can be achieved:
according to the constant power control circuit and the radio frequency ablation equipment, the control circuit outputs a digital signal of the appointed target output power, and then the digital signal is converted by the digital-to-analog conversion circuit to obtain the power feedback voltage related to the target output power, so that the output power can be controlled to control the change of the output voltage, the stability of the radio frequency output power is maintained, the constant power control is realized, and the problem of unstable output power is avoided; in addition, the utility model adopts hardware circuits such as an open-square operation circuit, an analog operation circuit and the like, and avoids the problem of slow response speed caused by controlling output voltage by software.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A constant power control circuit of radio frequency ablation equipment is characterized by comprising an impedance detection circuit, an evolution operation circuit, a power voltage output circuit and an analog operation circuit;
the impedance detection circuit is connected with the squaring operation circuit and is used for detecting the impedance of the impedance to be detected to obtain impedance detection voltage and feeding back the impedance detection voltage to the squaring operation circuit; the voltage of the impedance detection voltage can represent the impedance of the impedance to be detected;
the power-on operation circuit is used for power-on of the impedance detection voltage to obtain a power-on voltage, and the power-on operation circuit is connected with the analog operation circuit to feed the power-on voltage back to the analog operation circuit;
the power voltage output circuit is connected with the analog operation circuit so as to output a power feedback voltage to the analog operation circuit, wherein the power feedback voltage is related to the target output power of a power supply unit of the radio frequency ablation equipment;
the analog operation circuit is connected with a control end of a power supply unit of the radio frequency generation circuit so as to feed back a voltage control signal of the power supply unit to indicate the power supply unit to output a current power supply to the radio frequency generation unit, and the voltage of the current power supply is matched with the voltage control signal.
2. The constant power control circuit according to claim 1, wherein the power voltage output circuit comprises a control circuit and a digital-to-analog conversion circuit;
the control circuit is connected with the digital-to-analog conversion circuit to send a digital signal to the digital-to-analog conversion circuit; the digital signal is related to the target output power of a power supply unit in the radio frequency ablation device;
the digital-to-analog conversion circuit is used for converting the digital signal into an analog signal to obtain a power feedback voltage related to the target output power, and the digital-to-analog conversion circuit is connected with the analog operation circuit to feed the power feedback voltage back to the analog operation circuit.
3. The constant power control circuit according to claim 1, wherein the power voltage output circuit comprises a voltage generator for generating the power feedback voltage.
4. The constant power control circuit according to claim 1, wherein the impedance detection circuit comprises: the device comprises a current detection circuit, a voltage detection circuit and an analog divider;
the current detection circuit is connected in series with the impedance to be detected;
the feedback end of the current detection circuit is connected with the analog divider so as to feed back current feedback voltage to the analog divider, and the voltage of the current feedback voltage can represent the current of the impedance to be detected;
the voltage detection circuit is connected with the impedance to be detected in parallel, the feedback end of the voltage detection circuit is also connected with the analog divider so as to feed back voltage to the analog divider, and the voltage of the voltage feedback voltage can represent the voltage of the impedance to be detected;
and the output end of the analog divider is used for directly or indirectly outputting the impedance detection voltage.
5. The constant power control circuit according to claim 4, wherein the analog divider is an analog proportional divider.
6. The constant power control circuit according to claim 4, wherein the analog divider comprises: a first inverting sub-circuit and a dividing sub-circuit;
the first inverting sub-circuit of the radio frequency ablation device comprises a first resistor, a second resistor and a first amplifier, and the dividing sub-circuit comprises a third resistor, a fourth resistor, a second amplifier and a first chip;
the first end of the first amplifier is connected with the first end of the first resistor, the second end of the first amplifier is grounded, the second end of the first resistor is connected with the voltage detection circuit, the first end of the first resistor is also connected with the first end of the second resistor, the second end of the second resistor is connected with the third end of the first amplifier, the third end of the first amplifier is also connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the second amplifier, the second end of the second amplifier is grounded, the second end of the third resistor is also connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the first end of the first chip, the second end of the first chip is connected with the current detection circuit, and the third end of the first chip is connected with the third end of the second amplifier, and the third end of the second amplifier is connected with the voltage output circuit.
7. The constant power control circuit according to claim 1, wherein the squaring circuit comprises: a second inverting sub-circuit and a square root sub-circuit;
the second inverting sub-circuit of the radio frequency ablation device comprises a fifth resistor, a sixth resistor and a third amplifier, and the square root sub-circuit comprises a seventh resistor, an eighth resistor, a fourth amplifier and a second chip;
a first end of the fifth resistor is connected with the impedance detection circuit, a second end of the fifth resistor is connected with a first end of the third amplifier, the second end of the third amplifier is grounded, the second end of the fifth resistor is also connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the third end of the third amplifier, the third end of the third amplifier is also connected with the first end of the seventh resistor, a second end of the seventh resistor is connected to a first end of the fourth amplifier, a second end of the fourth amplifier is grounded, the second end of the seventh resistor is also connected with the first end of the eighth resistor, the second end of the eighth resistor is connected with the second chip, and the second end of the second chip and the third end of the second chip are connected with the third end of the fourth amplifier, and the third end of the fourth amplifier is connected with the analog operation circuit.
8. The constant power control circuit according to any one of claims 1 to 7, wherein the analog operation circuit comprises an analog proportional multiplier,
the analog proportional multiplier is used for multiplying the square operation voltage, the power feedback voltage and a specified coefficient to obtain the voltage control signal.
9. The constant power control circuit according to claim 2, wherein the control circuit comprises a micro control unit.
10. A radio frequency ablation device comprising the constant power control circuit of the radio frequency ablation device of any one of claims 1 to 9 and the power supply unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123396565.0U CN216956799U (en) | 2021-12-27 | 2021-12-27 | Radio frequency ablation equipment and constant power control circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123396565.0U CN216956799U (en) | 2021-12-27 | 2021-12-27 | Radio frequency ablation equipment and constant power control circuit thereof |
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