CN-122001219-A - Medical isolation regulation type positive and negative direct current output high-voltage switching power supply circuit

CN122001219ACN 122001219 ACN122001219 ACN 122001219ACN-122001219-A

Abstract

The invention provides a medical isolation regulation type positive and negative direct current output high-voltage switch power supply circuit, and belongs to the technical field of power supply circuits. The circuit comprises a transformer, a push-pull conversion structure, a multi-stage secondary sub-coil, a positive and negative voltage doubling rectifying circuit and a logic control switch group. The secondary winding of the transformer is composed of a positive high-voltage secondary winding and a negative high-voltage secondary winding, each secondary winding is composed of a plurality of secondary sub-coils in series connection, each sub-coil and the voltage doubling rectifying unit are connected with a logic switch, the on-off state of the switch is controlled through an optical isolation driver by a logic controller, and the positive and negative high-voltage output can be adjusted and the multi-gear switching is realized. The invention solves the problems of single output, redundant equipment and high cost of the traditional medical power supply, realizes flexible regulation and electrical isolation of high-voltage output, and is suitable for medical experimental equipment requiring multiple high voltages such as protein separation and the like.

Inventors

LI XUELEI
MA JIAWANG
QIAO BOHAO
FENG LI
YANG LINGLING

Assignees

天津光电惠高电子有限公司
天津光电集团有限公司

Dates

Publication Date: 20260508
Application Date: 20251222

Claims (10)

1. The utility model provides a medical isolation regulation and control type positive and negative direct current output high-voltage switching power supply circuit, including transformer T, transformer T's primary winding comprises first primary winding np1 and second primary winding np2 end to end series connection, characterized by that transformer T's secondary winding comprises positive high-voltage secondary winding and negative high-voltage secondary winding phase connection, positive high-voltage secondary winding's synonym end is connected with negative high-voltage secondary winding's synonym end and ground GND; The positive high-voltage secondary winding and the negative high-voltage secondary winding are respectively matched with a group of voltage doubling rectifying circuits, namely the positive high-voltage secondary winding is matched with the positive voltage doubling rectifying circuits, and the negative high-voltage secondary winding is matched with the negative voltage doubling rectifying circuits; Each group of voltage-multiplying rectifying circuits is formed by sequentially connecting m voltage-multiplying rectifying units in series, each voltage-multiplying rectifying unit is formed by a first diode, a second diode, a first capacitor and a second capacitor, the left end of the first capacitor is used as a first input end of the voltage-multiplying rectifying unit, the right end of the first capacitor is connected with the negative electrode of the first diode, the positive electrode of the second diode is used as a first output end of the voltage-multiplying rectifying unit, the negative electrode of the second diode is connected with the right end of the second capacitor, the connecting point is used as a second output end of the voltage-multiplying rectifying unit, the positive electrode of the first diode is connected with the left end of the second capacitor, and the connecting point is used as a first input end of the voltage-multiplying rectifying unit; Each secondary sub-coil of the secondary winding of the transformer T is respectively matched with a logic switch, and the logic switches are defined as sub-coil logic switches; each voltage-multiplying rectifying unit is also respectively matched with a logic switch, and for convenience of description, the logic switches are defined as voltage-multiplying logic switches; The homonymous end of each secondary sub-coil is connected with the input end of the corresponding sub-coil logic switch; The output ends of the sub-coil logic switches corresponding to the secondary sub-coils of the positive high-voltage secondary winding are commonly connected to the first input end of the positive voltage doubler rectifying circuit, and the second input end of the positive voltage doubler rectifying circuit is grounded to GND; The output ends of the sub-coil logic switches corresponding to the secondary sub-coils of the negative high-voltage secondary winding are commonly connected to the first input end of the negative voltage doubler rectifying circuit, and the second input end of the negative voltage doubler rectifying circuit is grounded to GND; the second output end of each voltage doubling rectifying unit is connected with the input end of the corresponding voltage doubling logic switch; the output ends of the voltage doubling logic switches corresponding to the voltage doubling rectifying units of the positive voltage doubling rectifying circuit are commonly connected to a positive high voltage output end VA of the whole circuit; The output ends of the voltage doubling logic switches corresponding to the voltage doubling rectifying units of the negative voltage doubling rectifying circuit are commonly connected to a negative high voltage output end VB of the whole circuit; each logic switch is respectively matched with one optical isolation driver, each optical isolation driver is electrically connected to the output control end of the logic controller, and the logic controller controls the on and off of the corresponding logic switch through the optical isolation driver.
2. The power supply circuit of claim 1, wherein at the same time, one and only one of the sub-coil logic switches corresponding to the secondary sub-coils of the positive high-voltage secondary winding are in a conducting state, one and only one of the sub-coil logic switches corresponding to the secondary sub-coils of the negative high-voltage secondary winding are in a conducting state, one and only one of the voltage-multiplying logic switches corresponding to the voltage-multiplying rectifying units of the positive voltage-multiplying rectifying circuit are in a conducting state, one and only one of the voltage-multiplying logic switches corresponding to the voltage-multiplying rectifying units of the negative voltage-multiplying rectifying circuit are in a conducting state, and the ordering positions of the logic switches in the conducting state in the corresponding groups are the same.
3. The medical isolation regulation type positive and negative direct current output high-voltage switch power supply circuit as claimed in claim 1, further comprising a PWM controller, a MOS tube Q1 and a MOS tube Q2, wherein a direct current input voltage Vcc end is connected to the joint of the first primary coil np1 and the second primary coil np2, the homonymous end of the first primary coil np1 is connected with the drain electrode of the MOS tube Q1, the heteronymous end of the second primary coil np2 is connected with the drain electrode of the MOS tube Q2, the source electrode of the MOS tube Q1 is connected with the source electrode of the MOS tube Q2 and then grounded GND, and the grid electrode of the MOS tube Q1 and the grid electrode of the MOS tube Q2 are respectively connected with the output end of the PWM controller.
4. A medical isolation control type positive and negative direct current output high voltage switch power supply circuit as claimed in claim 3, wherein the direct current input voltage Vcc terminal is further grounded GND via a capacitor C1.
5. The medical isolation control type positive and negative direct current output high-voltage switch power supply circuit according to claim 1, wherein the number of turns of the first primary coil np1 is equal to the number of turns of the second primary coil np 2.
6. The medical isolation regulation type positive and negative direct current output high-voltage switch power supply circuit as claimed in claim 1, wherein the m secondary sub-coils are sequentially connected in series, namely the synonym end of the last secondary sub-coil is connected with the synonym end of the next secondary sub-coil, the synonym end of the secondary sub-coil at the head and tail of the row is used as the synonym end of the whole group, and the synonym end of the secondary sub-coil at the tail of the row is used as the synonym end of the whole group.
7. The medical isolation regulated positive and negative dc output high voltage switching power supply circuit of claim 1, wherein the number of turns of each secondary sub-coil is equal.
8. The isolated control type positive and negative direct current output high-voltage switch power supply circuit for medical treatment according to claim 1, wherein each group of voltage doubling rectifying circuits is formed by sequentially connecting m voltage doubling rectifying units in series, specifically, a first output end of a last voltage doubling rectifying unit is connected with a first input end of a next voltage doubling rectifying unit, a second output end of the last voltage doubling rectifying unit is connected with a second input end of the next voltage doubling rectifying unit, the first input end and the second input end of the first voltage doubling rectifying unit are simultaneously used as the first input end and the second input end of the voltage doubling rectifying circuit of the group, and the first output end and the second output end of the voltage doubling rectifying unit at the tail of the sequence are simultaneously used as the first output end and the second output end of the voltage doubling rectifying circuit of the group.
9. The medical isolation control type positive and negative direct current output high-voltage switch power supply circuit according to claim 1, wherein the logic switch is a normally open logic switch.
10. The medical isolation regulation type positive and negative direct current output high-voltage switch power supply circuit as claimed in claim 1, wherein the logic switch is a MOS tube, an IGBT, an NPN tube, a PNP tube or a relay.

Description

Medical isolation regulation type positive and negative direct current output high-voltage switching power supply circuit Technical Field The invention belongs to the technical field of power supply circuits, and particularly relates to an isolation regulation type positive and negative direct current output high-voltage switching power supply circuit suitable for medical equipment. Background The field of medical experiments has a device for separating and distinguishing different molecules according to the electric field characteristics of protein molecules, wherein the most critical component is a power supply for outputting high-voltage micro-current characteristics, and different molecular proteins are distinguished by providing different high voltages to form different electric fields. The conventional power supply generally only provides a single fixed value of output voltage, so that a plurality of power supplies or devices with different output voltages are needed to meet the requirements of different voltages, and the defects of various and complicated experimental instruments, high cost, inconvenience in carrying and the like are caused. Disclosure of Invention Aiming at the problems in the prior art, the invention provides the following technical scheme: The utility model provides a medical isolation regulation and control type positive and negative direct current output high-voltage switching power supply circuit, including transformer T, transformer T's primary winding comprises first primary winding np1 and second primary winding np2 end to end series connection, characterized by that transformer T's secondary winding comprises positive high-voltage secondary winding and negative high-voltage secondary winding phase connection, positive high-voltage secondary winding's synonym end is connected with negative high-voltage secondary winding's synonym end and ground GND; The positive high-voltage secondary winding and the negative high-voltage secondary winding are respectively matched with a group of voltage doubling rectifying circuits, namely the positive high-voltage secondary winding is matched with the positive voltage doubling rectifying circuits, and the negative high-voltage secondary winding is matched with the negative voltage doubling rectifying circuits; Each group of voltage-multiplying rectifying circuits is formed by sequentially connecting m voltage-multiplying rectifying units in series, each voltage-multiplying rectifying unit is formed by a first diode, a second diode, a first capacitor and a second capacitor, the left end of the first capacitor is used as a first input end of the voltage-multiplying rectifying unit, the right end of the first capacitor is connected with the negative electrode of the first diode, the positive electrode of the second diode is used as a first output end of the voltage-multiplying rectifying unit, the negative electrode of the second diode is connected with the right end of the second capacitor, the connecting point is used as a second output end of the voltage-multiplying rectifying unit, the positive electrode of the first diode is connected with the left end of the second capacitor, and the connecting point is used as a first input end of the voltage-multiplying rectifying unit; Each secondary sub-coil of the secondary winding of the transformer T is respectively matched with a logic switch, and the logic switches are defined as sub-coil logic switches; each voltage-multiplying rectifying unit is also respectively matched with a logic switch, and for convenience of description, the logic switches are defined as voltage-multiplying logic switches; The homonymous end of each secondary sub-coil is connected with the input end of the corresponding sub-coil logic switch; The output ends of the sub-coil logic switches corresponding to the secondary sub-coils of the positive high-voltage secondary winding are commonly connected to the first input end of the positive voltage doubler rectifying circuit, and the second input end of the positive voltage doubler rectifying circuit is grounded to GND; The output ends of the sub-coil logic switches corresponding to the secondary sub-coils of the negative high-voltage secondary winding are commonly connected to the first input end of the negative voltage doubler rectifying circuit, and the second input end of the negative voltage doubler rectifying circuit is grounded to GND; the second output end of each voltage doubling rectifying unit is connected with the input end of the corresponding voltage doubling logic switch; the output ends of the voltage doubling logic switches corresponding to the voltage doubling rectifying units of the positive voltage doubling rectifying circuit are commonly connected to a positive high voltage output end VA of the whole circuit; The output ends of the voltage doubling logic switches corresponding to the voltage doubling rectifying units of the negative voltage doubling rect