CN111181364A

CN111181364A - Power supply circuit of medical instrument

Info

Publication number: CN111181364A
Application number: CN202010104877.0A
Authority: CN
Inventors: 彭代忠
Original assignee: Shanghai Shengzhe Medical Technology Co ltd
Current assignee: Shanghai Shengzhe Medical Technology Co ltd
Priority date: 2020-02-20
Filing date: 2020-02-20
Publication date: 2020-05-19

Abstract

The embodiment of the invention discloses a power supply circuit of a medical instrument, which comprises a first power supply conversion circuit, a control circuit, a driving circuit and an isolation transformer circuit; the first power supply conversion circuit is used for converting the first direct-current voltage into a second direct-current voltage and outputting the second direct-current voltage from an output end of the first power supply conversion circuit; the input end of the control circuit is connected with a first direct current voltage, and the control circuit is used for generating a driving control signal to control the operation of the medical instrument; the input end of the driving circuit is electrically connected with the output end of the control circuit, the input end of the isolation transformer circuit is electrically connected with the output end of the driving circuit, the output end of the isolation transformer circuit is electrically connected with the medical instrument, and the isolation transformer is used for isolating the control circuit from the medical instrument. The technical scheme provided by the embodiment of the invention avoids the problem of long signal transmission delay caused by adopting a plurality of optical coupling chips, and simultaneously reduces the number of corresponding driving circuits of the optical coupling chips, thereby reducing the power consumption of the system.

Description

Power supply circuit of medical instrument

Technical Field

The embodiment of the invention relates to the technical field of electronics, in particular to a power supply circuit of a medical instrument.

Background

Along with the improvement of living standard, people put higher requirements on the safety and comfort of medical treatment, and the tertiary medical treatment has biocompatibility and also ensures that the medical apparatus has enough safety when contacting human muscle and blood vessels.

In the prior art, electrosurgical medical instruments are isolated to realize the safe isolation of an application part and a strong current part, but most manufacturers adopt a traditional optical coupling isolation scheme at present; this kind of isolation scheme needs more opto-coupler chip, has the problem that transmission delay is long, the consumption is big, and because the opto-coupler has the phenomenon of light decay, leads to the product life-span short, can't satisfy the medical requirement better.

Disclosure of Invention

The embodiment of the invention provides a power supply circuit of a medical instrument, which can enhance the reliability and stability of a system and reduce the transmission delay and power consumption of the system on the basis of realizing the isolation between the medical instrument and a control circuit.

The embodiment of the invention provides a power supply circuit of a medical instrument, which comprises: the power supply comprises a first power supply conversion circuit, a control circuit, a driving circuit and an isolation transformer circuit;

the first power conversion circuit comprises an input end and an output end, the input end of the first power conversion circuit is connected with a first direct current voltage, and the first power conversion circuit is used for converting the first direct current voltage into a second direct current voltage and outputting the second direct current voltage from the output end of the first power conversion circuit;

the control circuit comprises an input end and an output end, the input end of the control circuit is connected with the first direct current voltage, and the control circuit is used for generating a driving control signal to control the medical apparatus to operate;

drive circuit includes input and output, drive circuit's input with control circuit's output electricity is connected, isolation transformer circuit includes voltage regulation end, input and output, isolation transformer circuit's voltage regulation end inserts second direct current voltage, isolation transformer circuit's input with drive circuit's output electricity is connected, isolation transformer circuit's output with the medical instrument electricity is connected, isolation transformer is used for realizing control circuit with electrical isolation between the medical instrument.

Optionally, the isolation transformer circuit includes a transformer, the transformer includes a primary side and a secondary side, the primary side of the transformer is electrically connected to the output end of the driving circuit, and the secondary side of the transformer is electrically connected to the medical instrument.

Optionally, the driving circuit includes a first driving chip, a first transistor and a second transistor, where the first driving chip includes a first enable terminal, a first input terminal, a first output terminal, a second enable terminal, a second input terminal and a second output terminal; the control circuit comprises a first control chip;

the first enabling end and the second enabling end of the first driving chip are respectively and electrically connected with the driving signal output end of the first control chip, the first input end of the first driving chip is electrically connected with the first signal output end of the first control chip, the first output end of the first driving chip is electrically connected with the first end of the first transistor, the second end of the first transistor is electrically connected with the primary side of the transformer, and the third end of the first transistor is grounded;

the second input end of the first driving chip is electrically connected with the second signal output end of the first control chip, the second output end of the first driving chip is electrically connected with the first end of the second transistor, the second end of the second transistor is electrically connected with the primary side of the transformer, and the third end of the second transistor is grounded.

Optionally, the primary side of the transformer includes a first primary side and a second primary side, a first end of the first primary side is electrically connected to the second end of the first transistor, and a second end of the first primary side is electrically connected to the output end of the first power conversion circuit;

the first end of the second primary side is electrically connected with the output end of the first power supply conversion circuit, and the second end of the second primary side is electrically connected with the second end of the second transistor;

the secondary side of the transformer is electrically connected with the medical instrument.

Optionally, the isolation transformer circuit further includes a first sampling branch, a second sampling branch, and a first inductor, where the first sampling branch includes a first capacitor and a first resistor, and the second sampling branch includes a second capacitor and a third capacitor;

a first end of the first capacitor is electrically connected with a first end of a secondary side of the transformer, a second end of the first capacitor is electrically connected with a first end of the first resistor, a second end of the first resistor is electrically connected with a first end of the first inductor, and a second end of the first inductor is electrically connected with a second end of the secondary side of the transformer;

the first end of the second capacitor is electrically connected with the first end of the first capacitor, and the second end of the second capacitor is electrically connected with the first end of the first inductor through the third capacitor.

Optionally, the medical instrument power supply circuit further includes a first isolation sampling circuit; the first isolation sampling circuit comprises a first isolation chip, a fourth capacitor, a second resistor and a fifth capacitor; the first isolation chip comprises a power supply end, an input end and an output end;

a first end of the fourth capacitor is electrically connected with a second end of the first capacitor, a second end of the fourth capacitor is electrically connected with an input end of the first isolation chip, a power supply end of the first isolation chip is connected with a third direct-current voltage, an output end of the first isolation chip is electrically connected with a first feedback end of the first control chip through the second resistor, and the first feedback end of the first control chip is grounded through the fifth capacitor;

the medical instrument power supply circuit further comprises a second isolation sampling circuit; the second isolation sampling circuit comprises a second isolation chip, a third resistor, a fourth resistor and a sixth capacitor; the second isolation chip comprises a power supply end, an input end and an output end;

the first end of the third resistor is electrically connected with the second end of the second capacitor, the second end of the third resistor is electrically connected with the input end of the second isolation chip, the power end of the second isolation chip is connected to the third direct-current voltage, the output end of the second isolation chip is electrically connected with the second feedback end of the first control chip through the fourth resistor, and the second feedback end of the first control chip is grounded through the sixth capacitor.

Optionally, the power circuit of the medical instrument further includes an isolation communication circuit, the isolation communication circuit includes a communication chip, and the communication chip includes a power end, a signal receiving end and a signal sending end;

the power end of the communication chip is connected with a fourth direct-current voltage, the signal receiving end of the communication chip is electrically connected with the signal sending end of the first control chip, and the signal sending end of the communication chip is electrically connected with the signal receiving end of the first control chip.

Optionally, the first power conversion circuit includes a second driving chip, a third transistor, a fourth transistor, a second inductor, a fifth resistor, and a seventh capacitor, where the second driving chip includes an enable terminal, a first driving output terminal, and a second driving output terminal;

the enable terminal of the second driving chip is connected with the first direct-current voltage, the first driving output terminal of the second driving chip is electrically connected with the first terminal of the third transistor, the second terminal of the third transistor is connected with the first direct-current voltage, the third terminal of the third transistor is electrically connected with the second terminal of the fourth transistor, the third terminal of the fourth transistor is grounded, and the first terminal of the fourth transistor is electrically connected with the second driving output terminal of the second driving chip;

the first end of the second inductor is electrically connected with the third end of the third transistor, the second end of the second inductor is electrically connected with the first end of the fifth resistor, the second end of the fifth resistor is grounded through the seventh capacitor, and the second end of the fifth resistor is electrically connected with the second end of the first primary side.

Optionally, the power supply circuit of the medical instrument provided in the embodiment of the present invention further includes a second power conversion circuit, where the second power conversion circuit includes a first voltage conversion chip, a voltage regulator tube, a third inductor, a sixth resistor, and a second voltage conversion chip, the first voltage conversion chip includes a voltage input end, a voltage output end, and a feedback end, and the second voltage conversion chip includes an enable end and an output end;

the voltage input end of the first voltage conversion chip is connected with the first direct-current voltage, the voltage output end of the first voltage conversion chip is electrically connected with the first end of the third inductor, the second end of the third inductor is electrically connected with the feedback end of the first voltage conversion chip through the sixth resistor, the first end of the voltage regulator tube is electrically connected with the first end of the third inductor, and the second end of the voltage regulator tube is grounded;

the enable end of the second voltage conversion chip is electrically connected with the second end of the third inductor, and the output end of the second voltage conversion chip outputs the third direct-current voltage.

Optionally, the power circuit of the medical instrument provided in the embodiment of the present invention further includes a frequency modulation circuit, where the frequency modulation circuit includes a second control chip, and the second control chip includes a power supply terminal, a signal input terminal, and a signal output terminal;

the power supply end of the second control chip is connected to the third direct-current voltage, the signal input end of the second control chip is electrically connected with the communication signal output end of the first control chip, and the signal output end of the second control chip is electrically connected with the third feedback end of the first control chip.

According to the technical scheme provided by the embodiment of the invention, the driving circuit drives the isolation transformer circuit to operate according to the received driving control signal output by the control circuit, and the isolation transformer circuit adopts the isolation chip integrated with the chip-level transformer to realize the isolation between the medical instrument and the control circuit. Effectively avoiding the safety accidents caused by the contact of the medical appliance and the human body in the using process. Compared with the prior art, the technical scheme provided by the embodiment of the invention avoids the problem of signal transmission delay caused by adopting a plurality of optical coupling chips, and simultaneously reduces the number of corresponding driving circuits of the optical coupling chips, thereby reducing the power consumption of the system. In addition, the isolation transformer circuit has no attenuation problem, and the service life of the product can be greatly prolonged.

Drawings

Fig. 1 is a schematic structural diagram of a power circuit of a medical apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of another power circuit for a medical device according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of another power circuit for a medical device according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of another power circuit for a medical device according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another power circuit for a medical device according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of another power circuit for a medical device according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another power circuit for a medical device according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of another power circuit for a medical device according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of another power circuit of a medical device according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Fig. 1 is a schematic structural diagram of a power circuit of a medical apparatus according to an embodiment of the present invention. Referring to fig. 1, the medical instrument power supply circuit includes: a first power conversion circuit 10, a control circuit 20, a drive circuit 30 and an isolation transformer circuit 40; the first power conversion circuit 10 includes an input terminal a1 and an output terminal a2, the input terminal a1 of the first power conversion circuit 10 is connected to a first direct-current voltage VCC1, and the first power conversion circuit 10 is configured to convert the first direct-current voltage VCC1 into a second direct-current voltage VCC2 and output the second direct-current voltage VCC2 from the output terminal a2 thereof;

the control circuit 20 comprises an input terminal B1 and an output terminal B2, the input terminal B1 of the control circuit 20 is connected to a first direct current VCC1, and the control circuit 20 is configured to generate a driving control signal to control the operation of the medical instrument 50;

the driving circuit 30 comprises an input end E1 and an output end E2, the input end E1 of the driving circuit 30 is electrically connected with the output end B2 of the control circuit 20, the isolation transformer circuit 40 comprises a voltage regulating end F3, an input end F1 and an output end F2, the voltage regulating end F3 of the isolation transformer circuit 40 is connected to the second direct-current voltage VCC2, the input end F1 of the isolation transformer circuit 40 is electrically connected with the output end E2 of the driving circuit 30, the output end F2 of the isolation transformer circuit 40 is electrically connected with the medical instrument 50, and the isolation transformer circuit 40 is used for achieving electrical isolation between the control circuit 20 and the medical instrument 50.

Specifically, the first power conversion circuit 10 is configured to convert the first dc voltage VCC1 into a second dc voltage VCC2, so as to provide a dc voltage for the isolation transformer circuit. The first dc voltage VCC1 may be generated by a power circuit at the front end of the system, which rectifies and filters the ac voltage, converts the ac voltage into a first dc voltage VCC1, and supplies power to the first power conversion circuit 10 and the control circuit 20. The control circuit 20 may include an integrated microcontroller, and the control circuit 20 is configured to generate a driving control signal to the driving circuit 30, the driving circuit 30 drives the isolation transformer circuit 40 to operate according to the received driving control signal, and the isolation transformer circuit 40 outputs a voltage required by the medical device 50 to provide the power supply voltage for the medical device 50. The regulating terminal F3 of the isolation transformer circuit 40 inputs the second dc voltage VCC2 for regulating the voltage output to the medical device 50. The second dc voltage VCC2 is related to a load impedance connected to the output terminal of the isolation transformer circuit 40, and the larger the load impedance is, the larger the corresponding second dc voltage VCC2 is. The controller of the medical instrument 50 (the controller is not shown in fig. 1) controls the medical instrument 50 to perform the corresponding medical operation. Illustratively, the control circuit 20 may be a DSP for communication control with the medical instrument 50 and the medical instrument controller.

The isolation transformer circuit 40 is used for converting the first direct-current voltage VCC1 input by the system into a voltage matched with the medical instrument 50, and the isolation transformer circuit 40 comprises a transformer, has an electrical isolation effect, can realize electrical isolation between the medical instrument 50 and the control circuit 20, and effectively avoids the electric shock hazard caused by the contact between the medical instrument 50 and a human body in the use process. For example, the medical device may be an electrosurgical scalpel, and the scalpel is electrically isolated from the control circuit 20 by the isolation transformer circuit 40, that is, the scalpel is isolated from the power supply, so as to avoid the risk of electric shock to the human body when the scalpel contacts the muscle or organ tissue of the human body. And the isolation transformer circuit 40 is adopted to isolate the medical instrument 50 from the control circuit 20, so that an optical coupling chip is not needed, the problem of long transmission delay time existing among a plurality of optical coupling chips in the traditional technology is avoided, the number of corresponding drive circuits of the optical coupling chips is reduced, and the power consumption of the system is further reduced. In addition, the isolation transformer circuit 40 has no attenuation problem, and the service life of the product can be greatly prolonged.

Optionally, fig. 2 is a schematic structural diagram of another medical device power supply circuit provided in an embodiment of the present invention. Based on the above embodiment, referring to fig. 2, the isolation transformer circuit 40 includes a transformer T, the transformer T includes a primary side T1 and a secondary side T2, the primary side T1 of the transformer T is electrically connected to the output terminal E2 of the driving circuit 30, and the secondary side T2 of the transformer T is electrically connected to the medical device 50.

Specifically, the isolation transformer circuit 40 includes a transformer, which has an electrical isolation function, and can achieve electrical isolation between the medical apparatus 50 and the control circuit 20, thereby effectively avoiding the danger of electric shock caused by the medical apparatus 50 contacting with a human body in the using process. The advantage that sets up like this both can realize the adjustment of 40 output voltage of isolation transformer circuit, can keep apart medical instrument 50 and control circuit 20 again, and need not to adopt the opto-coupler chip, has avoided having the problem that transmission delay is long between a plurality of opto-coupler chips in the conventional art.

According to the technical scheme provided by the embodiment of the invention, the driving circuit drives the isolation transformer circuit to operate according to the received driving control signal output by the control circuit, and the isolation transformer circuit adopts the isolation chip integrated with the chip-level transformer to realize the isolation between the medical instrument and the control circuit. Effectively avoiding the safety accidents caused by the contact of the medical appliance and the human body in the using process. Compared with the prior art, the technical scheme provided by the embodiment of the invention does not need to adopt an optical coupling isolation chip, avoids the problem of long signal transmission delay caused by adopting a plurality of optical coupling chips, and simultaneously reduces the number of corresponding driving circuits of the optical coupling chips, thereby reducing the power consumption of the system. In addition, the isolation transformer circuit has no attenuation problem, and the service life of the product can be greatly prolonged.

Optionally, fig. 3 is a schematic structural diagram of another medical device power supply circuit according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 3, the driving circuit 30 includes a first driving chip U1, a first transistor Q1 and a second transistor Q2, the first driving chip U1 includes a first enable terminal 12, a first input terminal 11, a first output terminal 13, a second enable terminal 14, a second input terminal 15 and a second output terminal 16; the control circuit 20 includes a first control chip U2;

a first enable terminal 12 and a second enable terminal 14 of the first driver chip U1 are electrically connected to a driving signal output terminal 22 of the first controller chip U2, respectively, a first input terminal 11 of the first driver chip U1 is electrically connected to a first signal output terminal 21 of the first controller chip U2, a first output terminal 13 of the first driver chip U1 is electrically connected to a first terminal of a first transistor Q1, a second terminal of the first transistor Q1 is electrically connected to a primary side T1 of the transformer T, and a third terminal of the first transistor Q1 is grounded;

the second input terminal 15 of the first driver chip U1 is electrically connected to the second signal output terminal 23 of the first controller chip U2, the second output terminal 16 of the first driver chip U1 is electrically connected to the first terminal of the second transistor Q2, the second terminal of the second transistor Q2 is electrically connected to the primary side T1 of the transformer T, and the third terminal of the second transistor Q2 is grounded.

Specifically, the first control chip U2 may be a DSP, and the driving signal output terminal 22 of the first control chip U2 may be a GPIO interface, which is used to output the driving control signal generated by the first control chip U2 to control the operation of the driving circuit 30. The driving circuit 30 includes a first driving chip U1, the first driving chip U1 is configured to generate a PWM driving signal according to a driving control signal to drive the first transistor Q1 and the second transistor Q2 to alternately conduct and operate, the first transistor Q1 and the second transistor Q2 output an ac voltage to the primary side T1 of the transformer T, and the secondary side T2 of the transformer T senses the ac voltage of the primary side T1 to perform voltage conversion, so as to obtain a voltage required by the medical device 50. Illustratively, the first driving chip U1 may be an integrated chip having a voltage conversion function and composed of gates for driving the first transistor Q1 and the second transistor Q2. The first control chip U2 is a DSP, and the output driving voltage thereof is usually 3.3V, because the first transistor Q1 and the second transistor Q2 are high voltage transistors, and the driving capability of the driving voltage output by the first control chip U2 is not enough to make the first transistor Q1 and the second transistor Q2 work normally, therefore, the driving control signal (i.e., the driving voltage) output by the first control chip U2 is amplified by the first driving chip U1 to improve the driving capability of the first driving chip U1 to output the PWM signal, so as to drive the first transistor Q1 and the second transistor Q2 to work normally.

Based on the above embodiment, with continued reference to fig. 3, the primary side T1 of the transformer T includes a first primary side T11 and a second primary side T12, a first end of the first primary side T11 is electrically connected to a second end of the first transistor Q1, and a second end of the first primary side T12 is electrically connected to the output end a2 of the first power conversion circuit 10;

a first end of the second primary side T12 is electrically connected to the output end a2 of the first power conversion circuit 10, and a second end of the second primary side T12 is electrically connected to a second end of the second transistor Q2;

the secondary side T2 of the transformer T is electrically connected to the medical device 50.

Specifically, the primary side T1 of the transformer T includes a first primary side T11 and a second primary side T12, a second end of the first primary side T11 and a first end of the second primary side T12 are connected to a second direct current voltage VCC2, a first end of the first primary side T11 is connected to a voltage output by a first transistor Q1, and a second end of the second primary side T12 is connected to a voltage output by a second transistor Q2. When the first transistor Q1 is turned on, the first transistor Q1 forms a loop with the first primary side T11 (the second terminal of the first primary side T11 is electrically connected with the third terminal of the first transistor Q1 through a capacitor); when the second transistor Q2 is turned on, the second transistor Q2 forms a loop with the second primary side T12. During the process of the first transistor Q1 and the second transistor Q2 being turned on alternately, the primary side of the transformer T generates alternating voltage which is changed alternately, and the secondary side T2 induces the primary side alternating voltage and generates induced voltage, which is the voltage required by the medical instrument 50.

Optionally, fig. 4 is a schematic structural diagram of another medical device power supply circuit provided in an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 4, the isolation transformer circuit 40 further includes a first sampling branch 401, a second sampling branch 402, and a first inductor L1, the first sampling branch 401 includes a first capacitor C1 and a first resistor R1, and the second sampling branch 402 includes a second capacitor C2 and a third capacitor C3;

a first end of the first capacitor C1 is electrically connected with a first end of a secondary side T2 of the transformer T, a second end of the first capacitor C1 is electrically connected with a first end of a first resistor R1, a second end of the first resistor R1 is electrically connected with a first end of a first inductor L1, and a second end of the first inductor L1 is electrically connected with a second end of a secondary side T2 of the transformer T;

a first terminal of the second capacitor C2 is electrically connected to a first terminal of the first capacitor C1, and a second terminal of the second capacitor C2 is electrically connected to a first terminal of the first inductor L1 through the third capacitor C3.

Specifically, the first capacitor C1 and the first resistor R1 form a first sampling branch 401, and the first sampling branch 401 is used for collecting the output current of the isolation transformer circuit 40. The second capacitor C2 and the third capacitor C3 form a second sampling branch 402, and the second sampling branch 402 is used for collecting the output voltage of the isolation transformer circuit 40.

Optionally, fig. 5 is a schematic structural diagram of another medical device power supply circuit according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 5, the power circuit of the medical apparatus provided by the embodiment of the invention further includes a first isolation sampling circuit 60; the first isolation sampling circuit 60 comprises a first isolation chip U3, a fourth capacitor C4, a second resistor R2 and a fifth capacitor C5; the first isolation chip U3 includes a power terminal 31, an input terminal 32, and an output terminal 33;

a first end of a fourth capacitor C4 is electrically connected with a second end of the first capacitor C1, a second end of a fourth capacitor C4 is electrically connected with an input end 32 of the first isolation chip U3, a power supply end 31 of the first isolation chip U3 is connected to a third direct-current voltage VCC3, an output end 33 of the first isolation chip U3 is electrically connected with a first feedback end 24 of the first control chip U2 through a second resistor R2, and the first feedback end 24 of the first control chip U2 is grounded through a fifth capacitor C5;

the medical instrument power circuit further includes a second isolated sampling circuit 70; the second isolation sampling 70 circuit comprises a second isolation chip U4, a third resistor R3, a fourth resistor R4 and a sixth capacitor R6; the second isolator chip U4 includes a power supply terminal 41, an input terminal 42, and an output terminal 43;

a first end of the third resistor R3 is electrically connected to a second end of the second capacitor C2, a second end of the third resistor R3 is electrically connected to an input end 42 of the second isolation chip U4, a power supply end 41 of the second isolation chip U4 is connected to the third dc voltage VCC3, an output end 43 of the second isolation chip U4 is electrically connected to the second feedback end 25 of the first control chip U2 through the fourth resistor R4, and the second feedback end 25 of the first control chip U2 is grounded through the sixth capacitor C6.

Specifically, the first isolation sampling circuit 60 is electrically connected to the first sampling branch 401, and the first isolation sampling circuit 60 is configured to feed back the output current of the isolation transformer circuit 40 collected by the first sampling branch 401 to the control circuit 20, so as to form a closed-loop current regulation between the isolation transformer circuit 40 and the control circuit 20, so as to monitor and regulate the output current of the isolation transformer circuit 40 in real time. The second isolation sampling circuit 70 is electrically connected to the second sampling branch 402, and the second isolation sampling circuit 70 is configured to feed back the output voltage of the isolation transformer circuit 40 collected by the second sampling branch 402 to the control circuit 20, so as to form a closed-loop voltage regulation between the isolation transformer circuit 40 and the control circuit 20, so as to monitor and regulate the output voltage of the isolation transformer circuit 40 in real time. For example, the first isolation chip U3 may be an integrated operational amplifier chip, the first sampling branch 401 collects the output current of the isolation transformer circuit 40 and outputs the output current to the first end of the fourth capacitor C4 through the first capacitor C1, and the output current of the isolation transformer circuit 40 is converted into a current matched with the first control chip U2 through the first isolation chip U3. The first isolation chip U3 converts the continuous output current signal in analog form into a discrete current signal in digital form by passing the output current of the isolation transformer circuit 40 output by the first sampling branch 401 through an analog-to-digital converter. Wherein the analog-to-digital converter may be integrated in the first isolated chip U3.

The second isolation chip U4 may be an integrated operational amplifier chip, the second sampling branch 402 collects the output voltage of the isolation transformer circuit 40 and outputs the output voltage to the first end of the third resistor R3 through the second capacitor C2, and the output voltage of the isolation transformer circuit 40 is converted into a voltage matched with the first control chip U2 through the second isolation chip U4. And the first isolation chip U3 and the second isolation chip U4 have strong isolation capability, and can realize the electrical isolation between the isolation transformer circuit 40 and the first control chip U2, so that the system meets the safety voltage limit specified by the national standard. The second isolation chip U4 converts the continuous output voltage signal in analog form into a discrete voltage signal in digital form by passing the output voltage of the isolation transformer circuit 40 output by the second sampling branch 402 through an analog-to-digital converter. Wherein the analog-to-digital converter may be integrated in the second isolated chip U4. The first control chip U2 in the control circuit 20 adjusts the driving control signal output by the first control chip according to the collected digital voltage signal and current signal, so as to keep the output voltage and output current of the isolation transformer circuit 40 stable, which is beneficial to improving the stability of the system.

Optionally, fig. 6 is a schematic structural diagram of another medical device power supply circuit according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 6, the power supply circuit of the medical instrument according to the embodiment of the present invention further includes an isolation communication circuit 80, where the isolation communication circuit 80 includes a communication chip U5, and the communication chip 80 includes a power supply terminal 51, a signal receiving terminal 52, and a signal transmitting terminal 53;

the power supply terminal 51 of the communication chip U5 is connected to the fourth dc voltage VCC4, the signal receiving terminal 52 of the communication chip U5 is electrically connected to the signal transmitting terminal 26 of the first control chip U2, and the signal transmitting terminal 53 of the communication chip U5 is electrically connected to the signal receiving terminal 27 of the first control chip U2.

Specifically, the communication chip U5 may be a bus-type communication chip with an isolation function, such as an RS485 communication chip. The communication chip U5 collects input data of the medical instrument 50, and is connected to the first control chip U2 in a bus manner, so that data communication between the medical instrument 50 and the control circuit 20 can be realized.

In other embodiments, the first isolated sampling circuit 60, the second isolated sampling circuit 70, and the isolated communication circuit 80 may be integrated into a whole to form an isolated chip, which can reduce the size of the system.

Optionally, fig. 7 is a schematic structural diagram of another medical device power supply circuit according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 7, the first power conversion circuit 10 includes a second driving chip U6, a third transistor Q3, a fourth transistor Q4, a second inductor L2, a fifth resistor R5 and a seventh capacitor C7, and the second driving chip U6 includes an enable terminal 61, a first driving output terminal 62 and a second driving output terminal 63;

an enable terminal 61 of the second driving chip U6 is connected to the first direct current voltage VCC1, a first driving output terminal 62 of the second driving chip U6 is electrically connected to a first terminal of a third transistor Q3, a second terminal of the third transistor Q3 is connected to the first direct current voltage VCC3, a third terminal of the third transistor Q3 is electrically connected to a second terminal of a fourth transistor Q4, a third terminal of the fourth transistor Q4 is grounded, and a first terminal of the fourth transistor Q4 is electrically connected to a second driving output terminal 63 of the second driving chip U6;

a first end of the second inductor L2 is electrically connected to the third end of the third transistor Q3, a second end of the second inductor L2 is electrically connected to a first end of the fifth resistor R5, a second end of the fifth resistor R5 is grounded via the seventh capacitor C7, and a second end of the fifth resistor R5 is electrically connected to a second end of the first primary side T11.

Specifically, the second driving chip U6 is used to generate driving signals for the third transistor Q3 and the fourth transistor Q4 to drive the third transistor Q3 and the fourth transistor Q4 to be alternately turned on. The power supply terminal 61 of the second driver chip U6 inputs the first dc voltage VCC1, the first dc voltage VCC1 may be generated by a power supply circuit at the front end of the system, the power supply circuit rectifies and filters the ac voltage, and converts the ac voltage into the first dc voltage VCC1 to supply power to the second driver chip U6. The second driving chip U6 outputs driving signals to the third transistor Q3 and the fourth transistor Q4, respectively, thereby achieving voltage conversion. The converted alternating voltage can be rectified into a direct voltage, and a circuit consisting of the second inductor L2, the fifth resistor R5 and the seventh capacitor C7 is used for filtering the direct voltage and outputting a second direct voltage VCC 2. The third transistor Q3 and the fourth transistor Q4 may be integrated in a power conversion chip, which is beneficial to reducing the complexity of the system.

On the basis of the foregoing embodiment, with continued reference to fig. 7, the power circuit for a medical device according to the embodiment of the present invention further includes a second power conversion circuit 90, where the second power conversion circuit 90 includes a first voltage conversion chip U7, a voltage regulator VD, a third inductor L3, a sixth resistor R6, and a second voltage conversion chip U8, the first voltage conversion chip U7 includes a voltage input terminal 71, a voltage output terminal 72, and a feedback terminal 73, and the second voltage conversion chip U8 includes an enable terminal 81 and an output terminal 82;

a voltage input end 71 of the first voltage conversion chip U7 is connected with a first direct current voltage VCC1, a voltage output end 72 of the first voltage conversion chip U7 is electrically connected with a first end of a third inductor L3, a second end of the third inductor L3 is electrically connected with a feedback end 73 of the first voltage conversion chip U7 through a sixth resistor R6, a first end of a voltage regulator tube VD is electrically connected with a first end of the third inductor L3, and a second end of the voltage regulator tube VD is grounded;

the enable terminal 81 of the second voltage conversion chip U8 is electrically connected to the second terminal of the third inductor L3, and the output terminal 83 of the second voltage conversion chip U8 outputs the third dc voltage VCC 3.

Specifically, the second power conversion circuit 90 is used to implement isolated voltage conversion. The first voltage conversion chip U7 may be a buck conversion chip for converting the first dc voltage VCC1 into a fourth dc voltage VCC4 to provide a power supply voltage for the communication chip U5. The voltage regulator VD is used for stabilizing the fourth dc voltage VCC4, and preventing the fourth dc voltage VCC4 from generating a ripple to break down the communication chip U5. The third inductor is used for filtering the voltage output by the first voltage conversion chip U7 and outputting a fourth direct current voltage VCC 4. The second voltage conversion chip U8 is a buck conversion chip, and is configured to convert the fourth dc voltage VCC4 into a third dc voltage VCC3, and provide a power supply voltage for the first isolation chip U3 and the second isolation chip U4. For example, since the voltage difference between the third dc voltage VCC3 and the fourth dc voltage VCC4 is small, the second voltage conversion chip U8 may be a low voltage linear regulator to realize the conversion of the fourth dc voltage VCC4 to the third dc voltage VCC 3.

Optionally, fig. 8 is a schematic structural diagram of another medical device power supply circuit according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 8, the power circuit of the medical device according to the embodiment of the present invention further includes a frequency modulation circuit 100, where the frequency modulation circuit 100 includes a second control chip U9, and the second control chip U9 includes a power supply terminal 91, a signal input terminal 92, and a signal output terminal 93;

the power supply terminal 91 of the second control chip U9 is connected to the third dc voltage VCC3, the signal input terminal 92 of the second control chip U9 is electrically connected to the communication signal output terminal 28 of the first control chip U2, and the signal output terminal 93 of the second control chip U9 is electrically connected to the third feedback terminal 29 of the first control chip U2.

In particular, the second control chip U9 may be a frequency modulation chip for adapting the optimal operating frequency of the medical device 50 to adjust the dynamic system clock of the DSP. For example, the optimal operating frequency of the medical instrument 50 is 40kHz, and if the output frequency of the system is 39.8kHz, the frequency of the system output is matched to the optimal operating frequency of the medical instrument 50 by the frequency modulation circuit 100 adjusting the dynamic system clock of the control circuit 20, thereby maximizing the energy utilization of the system. The signal input terminals 92 of the second controller chip U9 include a plurality of sub input terminals for receiving signals transmitted by the first controller chip U2, such as clock signals, data signals and enable signals.

Optionally, fig. 9 is a schematic structural diagram of another medical device power supply circuit according to an embodiment of the present invention. On the basis of the above embodiment, referring to fig. 8 and 9, a power supply circuit for a medical instrument according to an embodiment of the present invention includes: the first power conversion circuit 10, the control circuit 20, the driving circuit 30, the isolation transformer circuit 40, the first isolation sampling circuit 60, the second isolation sampling circuit 70, the isolation communication circuit 80 and the second power conversion circuit 90 have the following specific working principles:

the first power conversion circuit 10 is configured to convert the first dc voltage VCC1 into a second dc voltage VCC2 to provide a power supply voltage for the primary side T1 of the transformer T. The first dc voltage VCC1 may be provided by an external power supply or by a preceding power supply circuit. The second power conversion circuit 90 converts the first dc voltage VCC1 into a third dc voltage VCC3, and provides a power supply voltage for the first isolation sampling circuit 60 and the second isolation sampling circuit 70. The control circuit 20 may be an integrated microcontroller for generating a driving control signal to the driving circuit 30, the driving circuit 30 drives the isolation transformer circuit 40 to operate according to the received driving control signal, the isolation transformer circuit 40 outputs a voltage required by the medical device 50 to provide a power voltage for the medical device 50, and the medical device 50 completes a corresponding medical operation through the controller. Compared with the prior art, the embodiment of the invention omits a plurality of optical couplers and optical coupler driving circuits, and realizes the electrical isolation between the medical instrument 50 and the control circuit 20 only by integrating the isolation chip of the chip-level transformer, and through calculation of technicians in the field, the power consumption of the technical scheme provided by the embodiment of the invention is 1.5mA/ch, and compared with the prior art, the system loss is greatly reduced. The time delay of the chip-level isolation transformer relative to the optical coupler is small, data transmission between systems can reach a nanosecond level, the problem of light attenuation does not exist, and the service life of a product is prolonged.

The first isolation sampling circuit 60 is electrically connected to the first sampling branch 401, and the first isolation sampling circuit 60 is configured to feed back the output current of the isolation transformer circuit 40 collected by the first sampling branch 401 to the control circuit 20, so as to form a closed-loop current regulation between the isolation transformer circuit 40 and the control circuit 20, so as to monitor and regulate the output current of the isolation transformer circuit 40 in real time. The second isolation sampling circuit 70 is electrically connected to the second sampling branch 402, and the second isolation sampling circuit 70 is configured to feed back the output voltage of the isolation transformer circuit 40 collected by the second sampling branch 402 to the control circuit 20, so as to form a closed-loop voltage regulation between the isolation transformer circuit 40 and the control circuit 20, so as to monitor and regulate the output voltage of the isolation transformer circuit 40 in real time. The isolation communication circuit 80 comprises a communication chip U5, the communication chip U5 collects input data of the medical apparatus 50 and is connected with the first control chip U2 in a bus mode, and data communication between the medical apparatus 50 and the control circuit 20 can be achieved to monitor whether the input data of the medical apparatus 50 are abnormal or not.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A medical device power circuit, comprising: the power supply comprises a first power supply conversion circuit, a control circuit, a driving circuit and an isolation transformer circuit;

drive circuit includes input and output, drive circuit's input with control circuit's output electricity is connected, isolation transformer circuit includes voltage regulation end, input and output, isolation transformer circuit's voltage regulation end inserts second direct current voltage, isolation transformer circuit's input with drive circuit's output electricity is connected, isolation transformer circuit's output with the medical instrument electricity is connected, isolation transformer circuit is used for realizing control circuit with electrical isolation between the medical instrument.

2. The medical device power circuit of claim 1, wherein the isolation transformer circuit comprises a transformer, the transformer comprising a primary side and a secondary side, the primary side of the transformer being electrically coupled to the output of the drive circuit, the secondary side of the transformer being electrically coupled to the medical device.

3. The medical instrument power supply circuit according to claim 2, wherein the driving circuit comprises a first driving chip, a first transistor and a second transistor, the first driving chip comprising a first enable terminal, a first input terminal, a first output terminal, a second enable terminal, a second input terminal and a second output terminal; the control circuit comprises a first control chip;

4. The medical instrument power supply circuit of claim 3, wherein the primary side of the transformer comprises a first primary side and a second primary side, a first end of the first primary side is electrically connected to the second end of the first transistor, and a second end of the first primary side is electrically connected to the output end of the first power conversion circuit;

5. The medical device power circuit of claim 4, wherein the isolation transformer circuit further comprises a first sampling branch, a second sampling branch, and a first inductance, the first sampling branch comprising a first capacitance and a first resistance, the second sampling branch comprising a second capacitance and a third capacitance;

6. The medical device power circuit of claim 5, further comprising a first isolated sampling circuit; the first isolation sampling circuit comprises a first isolation chip, a fourth capacitor, a second resistor and a fifth capacitor; the first isolation chip comprises a power supply end, an input end and an output end;

7. The medical device power supply circuit according to claim 6, further comprising an isolated communication circuit, the isolated communication circuit comprising a communication chip, the communication chip comprising a power supply terminal, a signal receiving terminal, and a signal transmitting terminal;

8. The medical instrument power supply circuit according to claim 4, wherein the first power conversion circuit comprises a second driving chip, a third transistor, a fourth transistor, a second inductor, a fifth resistor and a seventh capacitor, the second driving chip comprises an enable terminal, a first driving output terminal and a second driving output terminal;

9. The medical instrument power supply circuit of claim 6, further comprising a second power conversion circuit, the second power conversion circuit comprising a first voltage conversion chip, a voltage regulator tube, a third inductor, a sixth resistor, and a second voltage conversion chip, the first voltage conversion chip comprising a voltage input terminal, a voltage output terminal, and a feedback terminal, the second voltage conversion chip comprising an enable terminal and an output terminal;

the voltage input end of the first voltage conversion chip is connected with the first direct-current voltage, the voltage output end of the first voltage conversion chip is electrically connected with the first end of the third inductor, the second end of the third inductor is electrically connected with the feedback end of the first voltage conversion chip through the sixth resistor, the first end of the voltage regulator tube is electrically connected with the first end of the third inductor, and the second end of the voltage regulator tube is grounded; the enable end of the second voltage conversion chip is electrically connected with the second end of the third inductor, and the output end of the second voltage conversion chip outputs the third direct-current voltage.

10. The medical instrument power supply circuit of claim 6, further comprising a frequency modulation circuit, the frequency modulation circuit comprising a second control chip, the second control chip comprising a power supply terminal, a signal input terminal, and a signal output terminal;