CN108551163B - Energy storage element energy release and recovery circuit, high-voltage power supply, energy generator and method - Google Patents
Energy storage element energy release and recovery circuit, high-voltage power supply, energy generator and method Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 75
- 238000011084 recovery Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims abstract description 133
- 238000007599 discharging Methods 0.000 claims description 13
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- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000033228 biological regulation Effects 0.000 claims description 5
- 230000000740 bleeding effect Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 2
- 230000001976 improved effect Effects 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 5
- 230000000630 rising effect Effects 0.000 abstract description 5
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- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 12
- 210000001519 tissue Anatomy 0.000 description 11
- 238000002955 isolation Methods 0.000 description 10
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- 230000004044 response Effects 0.000 description 8
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- 238000005345 coagulation Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
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Abstract
The invention discloses an energy storage element energy release and recovery circuit, a high-voltage power supply, an energy generator and a method. The circuit comprises an energy storage element, a transformer, a first switch circuit, a second switch circuit and a control module for controlling the first switch circuit and the second switch circuit to be opened or closed; the energy storage element, the primary coil of the transformer and the first switching circuit form an energy discharge loop of the energy storage element, and the energy storage element, the secondary coil of the transformer and the second switching circuit form an energy recovery loop of the energy storage element. In the high-voltage power supply, the energy storage element is a capacitor connected in parallel with the output end of the high-voltage power supply. The energy that needs to release of energy storage component is released through the transformer fast, and with partial energy storage, converts into the energy that the high voltage output needs to utilize simultaneously, and the energy that dissipates through the thermal effect reduces, is favorable to suppressing the improvement of system temperature rise, increases the reliability. When the control signal is larger than the current feedback voltage, the first capacitor receives the energy provided by the high-voltage power supply and the discharge recovery circuit at the same time, and the rising speed of the output voltage is greatly improved.
Description
Technical Field
The present invention relates to an energy storage device energy discharging circuit, and more particularly, to an energy storage device energy discharging and recovering circuit, a high voltage power supply, an energy generator and a method.
Background
In most voltage or current output devices, in order to meet the stability output of the device, one or more capacitors are usually connected in parallel to the ground at the output end, and these capacitors reduce the dynamic response speed of the output of the device while increasing the stability of the output, especially when the signal at the output end needs to be dynamically adjusted along with the load change.
The electrosurgical energy generator generates high-frequency and high-voltage current which acts on the human body part to be operated to generate the surgical effects of cutting and coagulation.
The electrosurgical energy generator includes a high voltage power supply that generates a high voltage DC voltage output, a power amplifier that converts the DC voltage and high frequency low voltage signals to high frequency high voltage signals, a surgical electrode connected to the power amplifier, a sensor that detects real-time impedance of patient body tissue in a surgical electrode power loop, and a controller. Electrosurgical energy generators in single stage applications, the energy generator outputs high frequency, high voltage current from the surgical electrode while returning through the neutral electrode, forming a current loop. In a two stage application, the energy generator flows high frequency, high voltage current from one of the electrodes and back from the other electrode, forming a current loop. In single-stage and/or double-stage application, when the current of the operation electrode flows through different tissues such as muscles, bones, blood vessels and fat of a human body, and different tasks such as cutting, coagulation and the like in operation are performed, the impedance characteristics of the human body tissues are different, the controller compares the real-time impedance, the voltage, the current and the expected power detected by the current loop, and adjusts the output direct-current voltage of the high-voltage power supply in real time, so that the adjusted high-frequency high-voltage current is generated through the power amplifier circuit, and different clinical effects are generated.
In a conventional electrosurgical energy generator, the output of the high voltage power supply is connected in parallel with a larger capacitor that stores larger energy. In actual operation, the controller adjusts the output voltage of the high-voltage power supply based on the real-time impedance of the tissue at the operation position, so as to adjust the high-frequency high-voltage power signal output by the power amplifier to meet the preset target power acting on the human body part. The parallel capacitor can reduce the speed of the voltage of the output end of the high-voltage power supply in response to the control signal of the controller, so that the real-time response of the high-frequency high-voltage current output by the power amplifier to different surgical tissues or processing tasks is affected, and the clinical effect is affected.
The high-voltage power output end of the existing electrosurgical energy generator discharges the energy stored in the capacitor in a mode of connecting a resistor in parallel to the ground, the energy stored in the capacitor is dissipated in a form of resistance heat energy, the equipment temperature rise is increased, the power grade requirement on the resistance element is high, the resistance element is not easy to obtain, and in addition, the energy stored in the capacitor is not recycled.
In U.S. patent publication No. US9186201B2, a device and method for rapid discharge of high voltage power storage energy is disclosed, specifically as follows: the controller outputs a control signal to the high-voltage power supply according to the tissue impedance between the operation electrode and the neutral electrode and the current set expected power, and performs error comparison with the feedback voltage after the voltage division of the output voltage of the high-voltage power supply, when the control signal is lower than the feedback voltage, the error amplifier A1 outputs low voltage, PM is closed, meanwhile, the error amplifier A2 outputs high voltage, the switching tube 160 is controlled to be opened, and the stored energy on the capacitor 134 is rapidly discharged through the inductor 150, the switching tube 160 and the resistor 162; when the output voltage of the high-voltage power supply drops to the control signal set by the controller, the error amplifier A1 outputs a certain voltage to control PM, the error amplifier A2 outputs a low voltage to turn off the switching tube 160, and the diode 155 connected in parallel with the inductive load 150 discharges the energy stored in the inductance in a thermal manner. Although the patent can realize the rapid discharge of the capacitor stored energy at the high-voltage power supply of the energy generator, the output voltage can be rapidly reduced to a preset value. However, the released energy is stored in the load inductor and then dissipated in a heat mode, so that the temperature rise of the system is increased; and when the control signal is greater than the current feedback voltage, the output voltage rises only by means of the high-voltage power supply to supply energy, and the rising speed is limited.
Disclosure of Invention
The invention aims at least solving the technical problems in the prior art, and particularly creatively provides an energy discharging and recycling circuit of an energy storage element, a high-voltage power supply, an energy generator and a method.
In order to achieve the above object, according to a first aspect of the present invention, there is provided an energy storage element energy discharging and recovering circuit including an energy storage element, a transformer, a first switching circuit, a second switching circuit, and a control module controlling the opening or closing of the first switching circuit and the second switching circuit;
the energy storage element, the primary coil of the transformer and the first switching circuit form an energy discharge loop of the energy storage element,
the energy storage element energy release loop has the structure that: the first end of the energy storage element is connected with a non-homonymous end of a primary coil of the transformer, the homonymous end of the primary coil of the transformer is connected with a first connecting end of a first switching circuit, a second connecting end of the first switching circuit is connected with the ground, and a switching end of the first switching circuit is connected with a discharge control end of the control module;
the energy storage element, the secondary coil of the transformer and the second switching circuit form an energy recovery loop of the energy storage element,
The energy recovery loop of the energy storage element has the structure that: the first end of the energy storage element is also connected with the first connecting end of the second switching circuit, the second connecting end of the second switching circuit is connected with the homonymous end of the secondary coil of the transformer, the non-homonymous end of the secondary coil of the transformer is connected with the ground, the switching end of the second switching circuit is connected with the recovery control end of the control module, and the second end of the energy storage element is connected with the ground;
one or more second capacitors are also connected to the same-name end of the secondary coil of the transformer, the first end of each second capacitor is connected with the same-name end of the secondary coil of the transformer, and the second end of each second capacitor is connected with the ground.
The beneficial effects of the technical scheme are as follows: based on the structure of the transformer and the electromagnetic induction principle, the primary coil is used for forming an energy release loop, the secondary coil is used for forming an energy recovery loop, released energy is not dissipated in a heat energy form, the released energy is stored, the stored energy of the energy storage element is rapidly released and recovered to the energy storage element, energy is saved, the temperature rise of a system where the circuit structure is arranged can be reduced, the dynamic response characteristic of the system is improved, and the reliability is improved. The energy in the secondary coil is stored through the second capacitor, the energy of the primary coil is transferred to the second capacitor, the energy storage capacity of the energy recovery circuit can be increased, and enough peak current can be provided in a short time, so that the voltage of the energy storage capacitor can be quickly increased.
In a preferred embodiment of the invention, one or more first diodes are connected in series between the first end of the second capacitor and the same-name end of the secondary coil of the transformer, the anode of the first diode is connected with the same-name end of the secondary coil of the transformer, and the cathode of the first diode is connected with the first end of the second capacitor.
The beneficial effects of the technical scheme are as follows: the first diode is added to prevent the second capacitor from flowing backward to the secondary coil, so that the unidirectional current flow of the energy recovery circuit is ensured, and the secondary coil can only charge the second capacitor.
In a preferred embodiment of the invention, one or more second diodes are connected in series between the first end of the energy storage element and the first connection end of the second switching circuit, the cathode of the second diode being connected to the first end of the energy storage element, and the anode of the second diode being connected to the first connection end of the second switching circuit.
The beneficial effects of the technical scheme are as follows: the energy storage element or a power supply connected with the energy storage element is prevented from flowing backwards to the second capacitor and/or the secondary coil, and the energy recovery circuit can only charge the energy storage element.
In a preferred embodiment of the present invention, the first switching circuit includes a first MOS transistor, a drain electrode of the first MOS transistor is connected to a homonymous terminal of the primary winding of the transformer, a source electrode of the first MOS transistor is connected to ground, and a gate electrode of the first MOS transistor is connected to a drain control terminal of the control module.
The beneficial effects of the technical scheme are as follows: the MOS tube is used as a switching element of the energy release circuit, so that the MOS tube can bear large current, has fast dynamic response, is easy to control and has good reliability.
In a preferred embodiment of the present invention, the present invention further includes a bleed-off current limiting circuit, where the bleed-off current limiting circuit includes a fourth operational amplifier disposed between the gate of the first MOS transistor and the bleed-off control end of the control module, and a third resistor connected in series between the source of the first MOS transistor and ground;
the positive input end of the fourth operational amplifier is connected with the release control end of the control module, the negative input end of the fourth operational amplifier is respectively connected with the first end of the third resistor and the source electrode of the first MOS tube, and the output end of the fourth operational amplifier is connected with the grid electrode of the first MOS tube.
The beneficial effects of the technical scheme are as follows: and the energy discharge circuit of the energy storage element is prevented from being excessively large in discharge current and burning the circuit. The constant-current bleeder circuit is formed by the fourth operational amplifier, the third resistor and the first MOS tube, different current limiting values can be set by changing the resistance value of the third resistor, and the constant-current bleeder circuit is flexible and convenient to use and easy to adjust.
In a preferred embodiment of the present invention, the second switching circuit includes a second MOS transistor, a first resistor, a second resistor and a third MOS transistor,
The drain electrode of the second MOS tube is connected with the first end of the energy storage element, the source electrode of the second MOS tube is respectively connected with the same-name end of the secondary coil of the transformer and the first end of the first resistor, the grid electrode of the second MOS tube is respectively connected with the second end of the first resistor and the first end of the second resistor, the second end of the second resistor is connected with the drain electrode of the third MOS tube, the source electrode of the third MOS tube is connected with the ground, and the grid electrode of the third MOS tube is connected with the recovery control end of the control module.
The beneficial effects of the technical scheme are as follows: the MOS tube is used as a switching element of the energy release circuit, so that the MOS tube can bear large current, has fast dynamic response, is easy to control and has good reliability.
According to a second aspect of the present invention, there is provided a high voltage power supply comprising any one of the circuits described above, the energy storage element being a first capacitor connected in parallel to an output terminal of the high voltage power supply;
the control module comprises a feedback circuit, a controller, a first operational amplifier, a second operational amplifier, a third operational amplifier, a first reference power supply and a second reference power supply, wherein the feedback circuit is used for detecting the output voltage of the output end of the high-voltage power supply;
the input end of the feedback circuit is connected with the first end of the first capacitor, the output end of the feedback circuit is connected with the negative input end of the first operational amplifier, and the positive input end of the first operational amplifier is connected with the control signal end of the controller; the output end of the first operational amplifier is respectively connected with the negative input end of the second operational amplifier, the positive input end of the third operational amplifier and the voltage regulating end of the high-voltage power supply;
The positive input end of the second operational amplifier is connected with the output end of the first reference power supply, and the output end of the second operational amplifier is connected with the switch end of the first switch circuit;
and the negative input end of the third operational amplifier is connected with the output end of the second reference power supply, and the output end of the third operational amplifier is connected with the switch end of the second switch circuit.
The beneficial effects of the technical scheme are as follows: the technical scheme is used for feeding back the output voltage of the high-voltage power supply in real time, and the energy storage on the large capacitor can be rapidly released when the voltage output needs to be reduced by the high-voltage power supply, so that rapid voltage reduction is realized, and the released energy is stored; when the output voltage of the high-voltage power supply needs to be increased, the large capacitor receives the energy provided by the high-voltage power supply and the discharge recovery circuit, and the rising speed of the output voltage is greatly improved. Meanwhile, as the redundant energy of the bleeder circuit is stored and is not dissipated in a heat mode, the design of the bleeder circuit can reduce the temperature rise of the system and improve the reliability.
In a preferred embodiment of the present invention, the power supply further comprises a PWM signal generator, wherein an input end of the PWM signal generator is connected to an output end of the first operational amplifier, and an output end of the PWM signal generator is connected to a voltage regulation end of the high voltage power supply.
The beneficial effects of the technical scheme are as follows: the output voltage of the high-voltage power supply is regulated by the PWM signal generator, and the regulation precision is high.
According to a third aspect of the present invention there is provided an energy generator comprising any of the high voltage power supplies described above, further comprising an AC/DC converter, a power amplifier, one or two electrodes, a signal generator, and a sensor for detecting the impedance of the electrode current loop;
the input end of the AC/DC converter is connected with the mains supply, the output end of the AC/DC converter is connected with the input end of the high-voltage power supply, the output end of the high-voltage power supply is connected with the high-voltage input end of the power amplifier, the output end of the signal generator is connected with the high-frequency driving signal input end of the power amplifier, the output end of the power amplifier is connected with the first end of the electrode, the second end of the electrode acts on the operation part of the human body, and the output end of the sensor is connected with the signal input end of the controller;
or comprises an input device for setting the target power of the electrode acting on the human body part, and the output end of the input device is connected with the target power input end of the controller.
The beneficial effects of the technical scheme are as follows: the high-frequency high-voltage current output by the energy generator can be quickly regulated according to the change of the action part and the change of the working task of the electrode in operation, the real-time response to the resistance value of the operation is good, the temperature rise of the system is small, and the clinical effect is obvious.
According to a fourth aspect of the present invention, there is provided an energy bleeding and recovery method comprising:
comparing the control signal voltage output by the controller with the attenuation feedback voltage of the output voltage of the high-voltage power supply, wherein the control signal is the attenuation value of the target output voltage of the high-voltage power supply;
if the control signal voltage is smaller than the feedback voltage, the high-voltage power supply reduces the output voltage, the control module opens an energy discharging loop of a first capacitor connected in parallel with the output end of the high-voltage power supply and opens an energy recovery loop, the energy discharging loop comprises the first capacitor, a primary coil of a transformer and a first MOS tube, and the energy of the first capacitor is stored in the primary coil of the transformer;
if the control signal voltage is greater than the feedback voltage, the high-voltage power supply increases the output voltage and charges a first capacitor connected in parallel with the output end of the high-voltage power supply;
synchronously, the control module opens an energy recovery loop of the first capacitor and closes an energy release loop, wherein the energy recovery loop comprises the first capacitor, a transformer secondary coil, a second capacitor and a second MOS tube; energy in the primary coil of the transformer is transferred to the secondary coil, and the first capacitor is charged through the energy recovery loop.
The beneficial effects of the above technical scheme are: the energy needing to be discharged is rapidly discharged and stored through the transformer and then converted into the energy needing to be utilized by high-voltage output, the energy dissipated through the heat effect is reduced, the improvement of the temperature rise of the system is restrained, and the reliability is improved. When the control signal is larger than the current feedback voltage, the first capacitor receives the energy provided by the high-voltage power supply and the discharge recovery circuit at the same time, and the rising speed of the output voltage is greatly improved.
Drawings
FIG. 1 is a circuit diagram of a high voltage power supply in accordance with one embodiment of the present invention;
FIG. 2 is a system block diagram of an energy generator in an embodiment of the invention;
fig. 3 is a schematic diagram of a voltage detection circuit in an energy generator according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.
In a preferred embodiment, as shown in fig. 1, the circuit comprises an energy storage element, a transformer, a first switch circuit, a second switch circuit and a control module for controlling the opening or closing of the first switch circuit and the second switch circuit;
the energy storage element, the primary winding of the transformer and the first switching circuit form an energy discharge loop of the energy storage element,
the energy storage element energy release loop has the structure that: the first end of the energy storage element is connected with a non-homonymous end of the primary coil of the transformer, the homonymous end of the primary coil of the transformer is connected with a first connecting end of the first switching circuit, a second connecting end of the first switching circuit is connected with the ground, and a switching end of the first switching circuit is connected with a discharge control end of the control module;
The energy storage element, the secondary coil of the transformer and the second switching circuit form an energy recovery loop of the energy storage element,
the energy recovery loop of the energy storage element has the structure that: the first end of the energy storage element is also connected with the first connecting end of the second switching circuit, the second connecting end of the second switching circuit is connected with the homonymous end of the secondary coil of the transformer, the non-homonymous end of the secondary coil of the transformer is connected with the ground, the switching end of the second switching circuit is connected with the recovery control end of the control module, and the second end of the energy storage element is connected with the ground;
one or more second capacitors are also connected to the same-name end of the secondary coil of the transformer, the first end of each second capacitor is connected with the same-name end of the secondary coil of the transformer, and the second end of each second capacitor is connected with the ground.
In this embodiment, the energy storage element may be a capacitor, particularly a large capacitor, an inductance, a piezoelectric element, or the like. The first switch circuit and the second switch circuit can be realized by one or any combination of switch elements such as an electric control switch, a relay, a triode, a MOS tube and the like. The control module can comprise a singlechip or an MCU processor and a logic circuit, and can output high level or low level through an I/O pin of the singlechip or the MCU to control the opening and closing of the first switch circuit and the second switch circuit. The second capacitor can be selected to have larger capacitance, and a plurality of capacitors can be selected to be connected in parallel in order to increase the energy storage capacity of the second capacitor.
In a preferred embodiment of the invention, one or more first diodes are connected in series between the first end of the second capacitor and the same-name end of the secondary winding of the transformer, the anode of the first diode is connected with the same-name end of the secondary winding of the transformer, and the cathode of the first diode is connected with the first end of the second capacitor.
In this embodiment, the first diode may be a schottky diode, and in order to prevent breakdown of the first diode, a form in which a plurality of diodes having identical connection directions are connected in series may be selected.
In a preferred embodiment of the invention, one or more second diodes are connected in series between the first end of the energy storage element and the first connection end of the second switching circuit, the cathode of the second diode being connected to the first end of the energy storage element, and the anode of the second diode being connected to the first connection end of the second switching circuit.
In this embodiment, in order to prevent breakdown of the second diode, a form in which a plurality of diodes having identical connection directions are connected in series may be selected.
In a preferred embodiment of the present invention, the first switching circuit includes a first MOS transistor, a drain electrode of the first MOS transistor is connected to a homonymous terminal of the primary winding of the transformer, a source electrode of the first MOS transistor is connected to ground, and a gate electrode of the first MOS transistor is connected to a drain control terminal of the control module.
In this embodiment, the first MOS transistor is an NMOS transistor.
In a preferred embodiment of the present invention, the device further includes a bleed-off current limiting circuit, the bleed-off current limiting circuit includes a fourth operational amplifier disposed between the gate of the first MOS transistor and the bleed-off control end of the control module, and a third resistor connected in series between the source of the first MOS transistor and ground;
the positive input end of the fourth operational amplifier is connected with the release control end of the control module, the negative input end of the fourth operational amplifier is respectively connected with the first end of the third resistor and the source electrode of the first MOS tube, and the output end of the fourth operational amplifier is connected with the grid electrode of the first MOS tube.
In this embodiment, according to the principle of weak short, the voltage value at the first end of the third resistor is equal to the voltage value at the forward input end of the fourth operational amplifier, and if the voltage value at the forward input end of the fourth operational amplifier is constant, the energy-storage element energy discharging circuit discharges energy with constant current, so that setting of different limit values of the discharging current can be achieved by setting different resistance values for the third resistor.
In a preferred embodiment of the present invention, the second switching circuit includes a second MOS transistor, a first resistor, a second resistor and a third MOS transistor,
The drain electrode of the second MOS tube is connected with the first end of the energy storage element, the source electrode of the second MOS tube is respectively connected with the same-name end of the secondary coil of the transformer and the first end of the first resistor, the grid electrode of the second MOS tube is respectively connected with the second end of the first resistor and the first end of the second resistor, the second end of the second resistor is connected with the drain electrode of the third MOS tube, the source electrode of the third MOS tube is connected with the ground, and the grid electrode of the third MOS tube is connected with the recovery control end of the control module.
In this embodiment, the second MOS transistor may be a PMOS transistor, the third MOS transistor may be an NMOS transistor, when the recovery control end of the control module outputs a high level, the third MOS transistor is turned on, the second end of the second resistor is turned on with ground, the second MOS transistor is turned on, the second switch circuit is turned on, and the energy recovery circuit of the energy storage element is turned on.
The invention discloses a high-voltage power supply, as shown in figure 1, an energy storage element is a first capacitor connected in parallel with the output end of the high-voltage power supply;
the control module comprises a feedback circuit for detecting the output voltage of the output end of the high-voltage power supply, a controller, a first operational amplifier, a second operational amplifier, a third operational amplifier, a first reference power supply and a second reference power supply;
the input end of the feedback circuit is connected with the first end of the first capacitor, the output end of the feedback circuit is connected with the negative input end of the first operational amplifier, and the positive input end of the first operational amplifier is connected with the control signal end of the controller; the output end of the first operational amplifier is respectively connected with the negative input end of the second operational amplifier, the positive input end of the third operational amplifier and the voltage regulating end of the high-voltage power supply;
The positive input end of the second operational amplifier is connected with the output end of the first reference power supply, and the output end of the second operational amplifier is connected with the switch end of the first switch circuit;
the negative input end of the third operational amplifier is connected with the output end of the second reference power supply, and the output end of the third operational amplifier is connected with the switch end of the second switch circuit.
Preferably, the high-voltage power supply further comprises a PWM signal generator, wherein the input end of the PWM signal generator is connected with the output end of the first operational amplifier, and the output end of the PWM signal generator is connected with the voltage regulating end of the high-voltage power supply.
In this embodiment, the first reference power supply is a low-voltage power supply, the output voltage is less than 0.5V, the second reference power supply is a higher-voltage power supply, the output voltage is about 4.0V, the voltage reference chip is selected to be obtained by using a corresponding voltage reference chip or a voltage reference chip plus precision resistor voltage dividing network, the voltage reference chip is selected to be obtained by using REF2940AIDBZT, the first reference power supply can be obtained by using a 1.2V reference power chip LM385D-1-2 output voltage plus precision resistor voltage dividing network, and specific circuit structures can be obtained by those skilled in the art from the technical manual of the power chip.
In this embodiment, the feedback circuit is configured to perform attenuation feedback on the voltage at the output end of the high-voltage power supply, and attenuation feedback can be implemented through a series resistor voltage dividing network, and preferably, the resistance value in the voltage dividing network should be selected to have a larger resistance value, such as a mΩ -level high-voltage resistor, and the working voltage is 0-350V to reduce energy loss. The controller is a singlechip or MCU chip and peripheral circuits thereof, and can also be an FPGA, and the model can be XC3S100E-4VQG100C. The output voltage value of the control signal end of the controller is the attenuation value of the target output voltage value of the high-voltage power supply, and the attenuation multiple is consistent with that of the feedback circuit. In this embodiment, if there is no PWM signal generator, the high-voltage power supply may include a phase-shifting full-bridge DC/DC conversion circuit and a phase-shifting full-bridge control chip for controlling on or off of a MOS power tube of the phase-shifting full-bridge DC/DC conversion circuit, where the phase-shifting full-bridge control chip may be UCC3895, UCC28950, etc., and the specific circuit structure may refer to the chinese patent with publication number CN103204082B in the prior art, and the first operational amplifier outputs an analog control signal to the phase-shifting full-bridge control chip, and the phase-shifting full-bridge control chip generates a corresponding PWM control signal after receiving the analog control signal, so as to implement on-off control of the power MOS tube in the phase-shifting full-bridge DC/DC conversion circuit, thereby continuously generating a desired DC voltage value by the high-voltage power supply. In this embodiment, since the analog control itself is more susceptible to interference than the digital control signal, the frequency of the PWM signal generated by the phase-shift full-bridge control chip is increased only to a limited extent, and a certain time delay is provided, so that it is difficult to achieve a higher dynamic response, and a larger power deviation due to a tissue impedance change is likely to be caused, and a more ideal tissue effect may not be achieved. Therefore, a PWM signal generator is added which realizes different output voltages by modulating the duty cycle of the pulse width.
In this embodiment, the first operational amplifier is an error amplifier, the open loop dc gain of the error amplifier is larger, and the error amplifier is similar to the comparator in operation principle, and the main difference is that the error amplifier mainly uses the principle that the non-inverting input terminal and the inverting input terminal are virtually short, and the error amplifier is a closed loop system formed by the PWM signal generator. The error amplifier works in an amplifying state, namely when the error amplifier is stable, the voltage of the same phase end and the voltage of the opposite phase end are the same, and the output voltage of the error amplifier is between 0.8V and 3.3V due to the larger switching gain, so that the specific numerical value determines the duty ratio output by the PWM controller; when the voltage difference between the non-inverting terminal and the inverting terminal of the error amplifier is larger, the error amplifier is equivalent to a comparator, the output value of the error amplifier is generally smaller than 0.5V or larger than 4.0V, and the energy release loop or the energy recovery loop behind the error amplifier is triggered to work at the moment, and the energy storage capacitor is discharged or charged.
In this embodiment, the operating principle of the high-voltage power supply is:
the output voltage (control signal) of the control signal end of the controller is compared with the voltage (feedback voltage for short) of the direct current voltage of the high-voltage power output end after the direct current voltage is attenuated by the feedback circuit:
when the control signal is not much different from the feedback voltage:
The first operational amplifier works in a stable state, the output voltage is often between 0.8V and 3.3V, the output duty ratio of the PWM signal generator is determined by the output voltage of the first operational amplifier, the output voltage of the high-voltage power supply is regulated, when the output voltage of the high-voltage power supply is slightly higher than a target value, the output voltage of the feedback loop is slightly higher than the output control signal voltage of the controller, the first operational amplifier amplifies the difference value of the output voltage, the output voltage of the first operational amplifier is reduced, the PWM output duty ratio is reduced, and the output voltage is reduced, otherwise, when the output voltage is slightly reduced, the output voltage is increased through the regulation, and finally the output voltage is kept at a constant value (the value is equal to the voltage value of the output control signal of the controller multiplied by the feedback attenuation multiple) through the closed-loop regulation.
When the control signal is less than the feedback voltage:
when the voltage VO is outputted after error amplification by the first operational amplifier (namely the error amplifier A1), and the VO voltage is lower than the voltage VL outputted by the first reference power supply (VL is generally 0.5V), the duty ratio of the output signal of the PWM signal generator is 0, namely the output of the PWM controller is in a closed state, meanwhile, the VO and the VL carry out error amplification by the second operational amplifier (namely the error amplifier A2) to output a voltage larger than 0, and the first MOS tube Q1 is opened by a follower circuit formed by the fourth operational amplifier A4, at the moment, the stored energy of the first capacitor C1 at the output end of the high-voltage power supply passes through the transformer, the first MOS tube Q1 and the third resistor R3 form an energy release loop, and the redundant energy on the first capacitor C1 is rapidly released. Synchronously, the output end of the third operational amplifier A3 outputs low level to the grid electrode of the third MOS tube Q3, the third MOS tube Q3 is cut off, the second MOS tube Q2 is cut off, the energy recovery loop of the first capacitor C1 is disconnected, and the secondary coil of the transformer is cut off. When the primary coil of the transformer is equivalent to an inductor and the discharged current flows through the primary winding of the transformer, the energy of the discharged current is stored by the primary coil of the transformer, and in fig. 1, the third resistor R3, the first MOS transistor Q1 and the fourth operational amplifier A4 form a constant current source circuit, so that the maximum current flowing through the primary coil of the transformer is limited, and the circuit is prevented from being damaged.
When the control signal is greater than the feedback voltage:
when the output voltage VO is higher than the second reference power supply output voltage VH (VH generally takes a value of 4.0V) after being amplified by the first operational amplifier (i.e., the error amplifier A1), the duty ratio of the output signal of the PWM signal generator is the largest, i.e., the high-voltage power supply output terminal charges the first capacitor C1 with the largest current, so that the voltage of the first capacitor C1 rises rapidly. Meanwhile, VO and the output voltage VL of the first reference power supply are subjected to error amplification by a second operational amplifier (i.e., an error amplifier A2), a voltage smaller than 0V is output, a fourth operational amplifier A4 outputs a low level to control the second MOS transistor Q2 to be turned off, at this time, the primary coil of the transformer generates a reverse electromotive force, the reverse electromotive force is transferred to the secondary coil through the iron core and is charged to the second capacitor C2 through the secondary coil of the transformer and the first diode D1, i.e., the energy stored in the primary coil of the transformer is transferred to the second capacitor C2, meanwhile VO and VH are subjected to error amplification by a third operational amplifier (i.e., an error amplifier A3), the third operational amplifier outputs a high level to control the third MOS transistor Q3 to be turned on, and then the second MOS transistor Q2 is turned on through the first resistor R1 and the second resistor R2, at this time, the energy stored in the second capacitor C2 is charged to the first capacitor C1 through the second MOS transistor Q2 and the second diode D2, and the first capacitor C1 is simultaneously charged to the high voltage power supply and the energy recovery circuit is greatly improved.
The invention discloses an energy generator, in a preferred embodiment, as shown in fig. 2, the energy generator comprises the high-voltage power supply, an AC/DC converter, a power amplifier, one or two electrodes, a signal generator and a sensor for detecting the impedance of an electrode current loop;
the input end of the AC/DC converter is connected with the mains supply, the output end of the AC/DC converter is connected with the input end of the high-voltage power supply, the output end of the high-voltage power supply is connected with the high-voltage input end of the power amplifier, the output end of the signal generator is connected with the high-frequency driving signal input end of the power amplifier, the output end of the power amplifier is connected with the first end of the electrode, the second end of the electrode acts on the operation part of the human body, and the output end of the sensor is connected with the signal input end of the controller;
or comprises an input device for setting target power of the electrode acting on the human body part, and the output end of the input device is connected with the target power input end of the controller.
In this embodiment, the power amplifier converts a low-voltage high-frequency signal into a high-voltage high-frequency signal, and the high-voltage direct-current voltage is input at the high-voltage input end of the power amplifier for power supply, and the magnitude of the output direct-current voltage determines the magnitude of the high-frequency high-voltage signal output by the power amplifier. The low-voltage high-frequency signal is input at the high-frequency driving signal input end of the power amplifier and used as a driving signal, and the low-voltage high-frequency signal is a digital signal, can be TTL level with 5V or 3.3V amplitude, and has the frequency of hundreds of kHz. The high-voltage high-frequency signal is generated by a signal generator, the signal generator can be a special signal generating chip, such as MAX038, or a signal generating unit in the controller, and the controller can be an FPGA with the model number of XC3S100E-4VQG C.
In this embodiment, the power amplifier converts a low-voltage high-frequency signal into a high-voltage high-frequency signal, the input of the power amplifier includes a low-voltage high-frequency driving signal and a high-voltage direct-current voltage for power supply, the size of the direct-current voltage directly determines the size of the power amplifier for outputting the high-frequency high-voltage signal, the output signal of the signal generator determines the frequency of the high-frequency high-voltage signal, and the power amplifier can be selected from an APT8030JN, so that a circuit can be built by referring to a data manual by a person skilled in the art, and the details are omitted here.
In this embodiment, the energy generator is primarily used in electrosurgical procedures, and may be either a single electrode or a double electrode. The AC/DC converter is used for converting commercial power into direct current voltage and comprises a rectifier bridge circuit. The high-voltage power supply converts the direct-current voltage output by the AC/DC converter into high-voltage direct-current voltage with adjustable voltage, the voltage is set by the controller, the output direct-current voltage outputs high-frequency voltage in direct proportion to the direct-current voltage after being amplified, the high-frequency voltage is loaded to an operation part through an operation electrode, acts on tissues and returns to the power amplifier through a return electrode, and a high-frequency current loop is formed. The sensor comprises a voltage sensor and a current sensor which are respectively used for detecting real-time voltage and real-time current in the electrode current loop. Because of the different impedance of different tissues of the human body, the impedance of the electrode when performing different tasks is also different, such as hemostasis and cutting impedance. The sensor samples high-frequency voltage and current acting on tissues, the controller calculates real-time impedance, the controller calculates a target voltage value which is required to be output at the output end of the high-voltage power supply according to the current calculated impedance value, a target power value preset by a doctor and other electrical parameters, calculates a control signal voltage value of the target voltage value after the target voltage value passes through the attenuation multiple which is the same as that of the feedback circuit, outputs the control signal voltage value to the forward input end of the first operational amplifier through an internal D/A conversion channel, performs error amplification with the output voltage value of the feedback circuit, controls the output voltage of the high-voltage power supply by utilizing the error amplification output value, further controls the high-frequency voltage current loaded at an operation part, and finally enables the output high-frequency voltage current to reach the expected setting through repeated closed loop adjustment of the steps, thereby meeting the clinical effect.
In this embodiment, the sensor includes at least a current sensor for detecting the current at the output end of the energy generator and a voltage detection circuit for detecting the voltage at the output end, where the current sensor may be a hall current sensor or a current transformer, as shown in fig. 3, and the voltage detection circuit includes a capacitive voltage division network connected in parallel to the high-frequency high-voltage signal testing end and an analog isolator connected to the capacitive voltage division network;
the capacitive voltage division network comprises at least one first type of capacitor and at least one second type of capacitor which are connected in series according to any sequence, wherein the withstand voltage value of the first type of capacitor is higher than that of the second type of capacitor, the capacitance value of the first type of capacitor is smaller than that of the second type of capacitor, and the ratio of the withstand voltage value of the first type of capacitor to the withstand voltage value of the second type of capacitor is not smaller than that of the second type of capacitor;
two input ends of the analog isolator are connected in parallel with two ends of a second type capacitor or two ends of a series network formed by more than one second type capacitor.
In this embodiment, the high-frequency high-voltage signal testing end may be an output end of the electrosurgical energy generator, the frequency of the high-frequency high-voltage signal is typically several hundred KHz, the voltage peak is KV magnitude, for example 5KV, and the capacitive voltage division may avoid nonlinear influence caused by the resistive-inductive characteristic during resistive voltage division; one end of the capacitive voltage dividing network is connected with one electrode, and the other end is connected with the other electrode (the electrosurgical energy generator is applied in bipolar mode) or a neutral electrode (the electrosurgical energy generator is applied in monopolar mode).
The beneficial effects of the technical scheme are as follows: the inductance characteristic of the capacitor is negligible, and the voltage obtained through the capacitor voltage division network has a good linear corresponding relation with the voltage of the high-frequency high-voltage test terminal, so that the voltage test precision is improved; the high-frequency high-voltage testing end and the output end of the voltage detection circuit can be effectively isolated through the analog isolator, low-frequency signals generated by other signal processing circuits connected with the output end of the voltage detection circuit are prevented from being reversely coupled into the electrode, and the safety is improved. The requirements on the withstand voltage values of the first type of capacitor and the second type of capacitor can be reduced by connecting the first type of capacitor in series or connecting the second type of capacitor in series, so that the cost is reduced.
In this embodiment, according to the principle of capacitive voltage division, the first type of capacitor needs to bear most or all of the high-voltage drop of the high-frequency high-voltage test terminal, so that its capacitance value should be smaller or far smaller than that of the second type of capacitor, and preferably, the withstand voltage values of the first type of capacitor are all higher than the voltage peak value of the high-frequency high-voltage test terminal. When the first type of capacitance is a plurality of series connection and/or the second type of capacitance is a plurality of series connection, the withstand voltage value of any one first type of capacitance is higher than the withstand voltage value of any one second type of capacitance, the capacitance value of any one first type of capacitance is smaller than the capacitance value of any one second type of capacitance, and the ratio of the withstand voltage value of any one first type of capacitance to the withstand voltage value of any one second type of capacitance is not smaller than the ratio of the series equivalent capacitance value of all second types of capacitance to the series equivalent capacitance value of all first types of capacitance. Because the withstand voltage value of the capacitor has a larger influence on the cost of the capacitor, the cost can be reduced by adopting a mode of connecting a plurality of capacitors in series.
In this embodiment, the analog isolator may be an existing analog isolation circuit structure, such as an isolation amplifier, a linear optocoupler, or an isolation transformer, and a specific circuit structure may be set up by a person skilled in the art according to a data manual of the selected device, which is not described herein.
Preferably, the analog isolator comprises an isolation transformer T and a grounding resistor connected to the same-name end and/or the non-same-name end of a secondary coil of the isolation transformer T; the two ends of the primary coil of the isolation transformer T are connected in parallel with the two ends of a second type capacitor or the two ends of a series network formed by more than one second type capacitor.
The beneficial effects of the technical scheme are as follows: the specific circuit structure of the analog isolator is convenient to use, simple in structure and high in cost performance.
In this embodiment, in order to provide an energy release loop for the secondary winding of the isolation transformer T and extract the voltages at both ends thereof, a grounding resistor R5 may be connected in series to the same-name end of the secondary winding, the other end of the grounding resistor R5 is connected to ground, and/or the other end of the grounding resistor R4 is connected to ground to the non-same-name end of the secondary winding. The isolation transformer can be a low-voltage isolation transformer (low voltage means that the voltage to ground is 1000V or below), the primary-secondary turn ratio is preferably 1:1, or the similar proportion is selected, the isolation output of the piezoelectric signals is realized, the problem that the low-frequency signals at the controller end are reversely coupled to the electrode application end is avoided, and the safety is improved.
In this embodiment, preferably, the capacitive voltage division network includes a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5, where the third capacitor C3 and the fifth capacitor C5 are a first type capacitor, and the fourth capacitor C4 is a second type capacitor;
the first end of the third capacitor C3 is connected with the high-frequency high-voltage signal testing end, the second end of the third capacitor C3 is connected with the first end of the fourth capacitor C4, the second end of the fourth capacitor C4 is connected with the first end of the fifth capacitor C5, and the second end of the fifth capacitor C5 is connected with the common end of the high-frequency high-voltage signal. The common end of the high-frequency high-voltage signal is a neutral electrode in single-electrode application or another electrode except for the electrode where the high-frequency high-voltage signal testing end is located in double-electrode application.
In this embodiment, the device further comprises a signal conditioning circuit; the signal conditioning circuit comprises a multiplier, a low-pass filter and a first A/D converter;
the input end of the multiplier is connected with the output end of the analog isolator, the output end of the multiplier is connected with the input end of the low-pass filter, the output end of the low-pass filter is connected with the input end of the first A/D converter, and the output end of the first A/D converter is the output end of the voltage detection circuit.
In this embodiment, the multiplier may be selected from the analog multiplier chip AD734 and its peripheral circuit components, and specific circuit structures may be obtained by those skilled in the art through a chip manual. The low-pass filter can be built by using an RC low-pass filter or a low-pass filter chip, and the low-pass filter can be obtained by a person skilled in the art according to the prior art. The first a/D converter may be a high-speed a/D acquisition chip with 12 bits or higher acquisition precision, such as an MCP3201 chip and its peripheral circuits, and specific circuit structures may be obtained by those skilled in the art through a chip manual.
In this embodiment, preferably, the first type of capacitor is a high-voltage capacitor, and the withstand voltage value of the second type of capacitor is not greater than 100V;
and/or the capacitance ratio of the second type of capacitance to the first type of capacitance is not less than 100:1.
In the present embodiment, the high-voltage capacitor generally means a capacitor of 1kv or more, or a capacitor of 10kv or more. The capacitance value of the second type of capacitor is far greater than that of the high-voltage capacitor, for example, the ratio of the capacitance values is 500:1, even greater, for example, the first type of capacitor can be a high-voltage capacitor with the capacitance value of 10pF, and the second type of capacitor can be a capacitor with the capacitance value of 5.6nF and the withstand voltage value of 50V; the high-frequency high-voltage signal up to 5kV can be reduced to below 10V in a capacitive voltage division mode, then the high-frequency high-voltage signal is isolated by a low-voltage transformer, the signal is sent to an analog multiplier in a differential or single-ended input mode, after multiplication processing of the analog multiplier, an output signal is converted into a direct-current voltage through a low-pass filter, then the direct-current voltage is converted into a digital signal through a high-resolution A/D converter and then sent to a controller, the controller performs squaring processing, and the actual effective value voltage output by an energy generator is calculated according to the voltage division ratio designed by the capacitive voltage division at the front end.
The invention discloses an energy release and recovery method, which comprises the following steps:
Comparing the control signal voltage output by the controller with the attenuation feedback voltage of the output voltage of the high-voltage power supply, wherein the control signal is the attenuation value of the target output voltage of the high-voltage power supply;
if the control signal voltage is smaller than the feedback voltage, the high-voltage power supply reduces the output voltage, the control module opens an energy discharge loop of a first capacitor connected in parallel with the output end of the high-voltage power supply and opens an energy recovery loop, the energy discharge loop comprises the first capacitor, a primary coil of a transformer and a first MOS tube, and the energy of the first capacitor is stored in the primary coil of the transformer;
if the control signal voltage is greater than the feedback voltage, the high-voltage power supply increases the output voltage and charges a first capacitor connected in parallel with the output end of the high-voltage power supply;
synchronously, the control module opens an energy recovery loop of the first capacitor and closes an energy release loop, wherein the energy recovery loop comprises the first capacitor, a transformer secondary coil, a second capacitor and a second MOS tube; energy in the primary coil of the transformer is transferred to the secondary coil, and the first capacitor is charged through the energy recovery loop.
The energy needing to be discharged is rapidly discharged and stored through the transformer and then converted into the energy needing to be utilized by high-voltage output, the energy dissipated through the heat effect is reduced, the improvement of the temperature rise of the system is restrained, and the reliability is improved. When the control signal is larger than the current feedback voltage, the first capacitor receives the energy provided by the high-voltage power supply and the discharge recovery circuit at the same time, and the rising speed of the output voltage is greatly improved.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. The energy discharging and recycling circuit of the energy storage element is characterized by comprising the energy storage element, a transformer, a first switch circuit, a second switch circuit and a control module for controlling the opening or closing of the first switch circuit and the second switch circuit;
The energy storage element, the primary coil of the transformer and the first switching circuit form an energy discharge loop of the energy storage element,
the energy storage element energy release loop has the structure that: the first end of the energy storage element is connected with a non-homonymous end of a primary coil of the transformer, the homonymous end of the primary coil of the transformer is connected with a first connecting end of a first switching circuit, a second connecting end of the first switching circuit is connected with the ground, and a switching end of the first switching circuit is connected with a discharge control end of the control module;
the energy storage element, the secondary coil of the transformer and the second switching circuit form an energy recovery loop of the energy storage element,
the energy recovery loop of the energy storage element has the structure that: the first end of the energy storage element is also connected with the first connecting end of the second switching circuit, the second connecting end of the second switching circuit is connected with the homonymous end of the secondary coil of the transformer, the non-homonymous end of the secondary coil of the transformer is connected with the ground, the switching end of the second switching circuit is connected with the recovery control end of the control module, and the second end of the energy storage element is connected with the ground;
one or more second capacitors are also connected to the same-name end of the secondary coil of the transformer, the first end of each second capacitor is connected with the same-name end of the secondary coil of the transformer, and the second end of each second capacitor is connected with the ground;
One or more first diodes are connected in series between the first end of the second capacitor and the same-name end of the secondary coil of the transformer, the anode of each first diode is connected with the same-name end of the secondary coil of the transformer, and the cathode of each first diode is connected with the first end of the second capacitor;
one or more second diodes are connected in series between the first end of the energy storage element and the first connecting end of the second switching circuit, the cathode of each second diode is connected with the first end of the energy storage element, and the anode of each second diode is connected with the first connecting end of the second switching circuit.
2. The energy storage element energy discharging and recovering circuit according to claim 1, wherein the first switching circuit comprises a first MOS transistor, a drain electrode of the first MOS transistor is connected to a same-name end of the primary winding of the transformer, a source electrode of the first MOS transistor is connected to ground, and a gate electrode of the first MOS transistor is connected to a discharging control end of the control module.
3. The energy storage element energy bleeding and recovering circuit according to claim 2, further comprising a bleeding current limiting circuit comprising a fourth operational amplifier arranged between the gate of the first MOS transistor and the bleeding control end of the control module, a third resistor connected in series between the source of the first MOS transistor and ground;
The positive input end of the fourth operational amplifier is connected with the release control end of the control module, the negative input end of the fourth operational amplifier is respectively connected with the first end of the third resistor and the source electrode of the first MOS tube, and the output end of the fourth operational amplifier is connected with the grid electrode of the first MOS tube.
4. The energy storage element energy draining and recovering circuit according to claim 1, wherein the second switching circuit comprises a second MOS transistor, a first resistor, a second resistor and a third MOS transistor,
the drain electrode of the second MOS tube is connected with the first end of the energy storage element, the source electrode of the second MOS tube is respectively connected with the same-name end of the secondary coil of the transformer and the first end of the first resistor, the grid electrode of the second MOS tube is respectively connected with the second end of the first resistor and the first end of the second resistor, the second end of the second resistor is connected with the drain electrode of the third MOS tube, the source electrode of the third MOS tube is connected with the ground, and the grid electrode of the third MOS tube is connected with the recovery control end of the control module.
5. A high voltage power supply comprising a circuit according to any of claims 1-4, characterized in that the energy storage element is a first capacitor connected in parallel to the output of the high voltage power supply;
the control module comprises a feedback circuit, a controller, a first operational amplifier, a second operational amplifier, a third operational amplifier, a first reference power supply and a second reference power supply, wherein the feedback circuit is used for detecting the output voltage of the output end of the high-voltage power supply;
The input end of the feedback circuit is connected with the first end of the first capacitor, the output end of the feedback circuit is connected with the negative input end of the first operational amplifier, and the positive input end of the first operational amplifier is connected with the control signal end of the controller; the output end of the first operational amplifier is respectively connected with the negative input end of the second operational amplifier, the positive input end of the third operational amplifier and the voltage regulating end of the high-voltage power supply;
the positive input end of the second operational amplifier is connected with the output end of the first reference power supply, and the output end of the second operational amplifier is connected with the switch end of the first switch circuit;
and the negative input end of the third operational amplifier is connected with the output end of the second reference power supply, and the output end of the third operational amplifier is connected with the switch end of the second switch circuit.
6. The high voltage power supply of claim 5, further comprising a PWM signal generator, wherein an input of the PWM signal generator is connected to an output of the first operational amplifier, and an output of the PWM signal generator is connected to a voltage regulation terminal of the high voltage power supply.
7. An energy generator comprising the high voltage power supply of claim 5, further comprising an AC/DC converter, a power amplifier, one or both electrodes, a signal generator, and a sensor for detecting the impedance of the electrode current loop;
The input end of the AC/DC converter is connected with the mains supply, the output end of the AC/DC converter is connected with the input end of the high-voltage power supply, the output end of the high-voltage power supply is connected with the high-voltage input end of the power amplifier, the output end of the signal generator is connected with the high-frequency driving signal input end of the power amplifier, the output end of the power amplifier is connected with the first end of the electrode, the second end of the electrode acts on the operation part of the human body, and the output end of the sensor is connected with the signal input end of the controller;
or comprises an input device for setting the target power of the electrode acting on the human body part, and the output end of the input device is connected with the target power input end of the controller.
8. An energy generator comprising the high voltage power supply of claim 6, further comprising an AC/DC converter, a power amplifier, one or both electrodes, a signal generator, and a sensor for detecting the impedance of the electrode current loop;
the input end of the AC/DC converter is connected with the mains supply, the output end of the AC/DC converter is connected with the input end of the high-voltage power supply, the output end of the high-voltage power supply is connected with the high-voltage input end of the power amplifier, the output end of the signal generator is connected with the high-frequency driving signal input end of the power amplifier, the output end of the power amplifier is connected with the first end of the electrode, the second end of the electrode acts on the operation part of the human body, and the output end of the sensor is connected with the signal input end of the controller;
Or comprises an input device for setting the target power of the electrode acting on the human body part, and the output end of the input device is connected with the target power input end of the controller.
9. A method of energy bleeding and recuperation from a high voltage power supply according to any of claims 1 to 6, comprising:
comparing the control signal voltage output by the controller with the attenuation feedback voltage of the output voltage of the high-voltage power supply, wherein the control signal is the attenuation value of the target output voltage of the high-voltage power supply;
if the control signal voltage is smaller than the feedback voltage, the high-voltage power supply reduces the output voltage, the control module opens an energy discharging loop of a first capacitor connected in parallel with the output end of the high-voltage power supply and opens an energy recovery loop, the energy discharging loop comprises the first capacitor, a primary coil of a transformer and a first MOS tube, and the energy of the first capacitor is stored in the primary coil of the transformer;
if the control signal voltage is greater than the feedback voltage, the high-voltage power supply increases the output voltage and charges a first capacitor connected in parallel with the output end of the high-voltage power supply;
synchronously, the control module opens an energy recovery loop of the first capacitor and closes an energy release loop, wherein the energy recovery loop comprises the first capacitor, a transformer secondary coil, a second capacitor and a second MOS tube; energy in the primary coil of the transformer is transferred to the secondary coil, and the first capacitor is charged through the energy recovery loop.
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