CN110719023A - Isolation power supply without transformer - Google Patents
Isolation power supply without transformer Download PDFInfo
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- CN110719023A CN110719023A CN201910990826.XA CN201910990826A CN110719023A CN 110719023 A CN110719023 A CN 110719023A CN 201910990826 A CN201910990826 A CN 201910990826A CN 110719023 A CN110719023 A CN 110719023A
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- Prior art keywords
- diode
- power supply
- isolation
- capacitor
- isolation capacitor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
Abstract
The invention relates to an isolation power supply without a transformer, wherein the output of a high-speed PWM generator ① of the invention is connected with a driver ②, the output of the driver ② powered by a power supply V1 is respectively connected with a first isolation capacitor ③ and a second isolation capacitor ④, a first isolation capacitor ③ is connected with a first diode ⑤, a second isolation capacitor ④ is connected with a first diode ⑤, a first diode ⑤ is connected with a second diode ② 0, a second diode ② 1 is connected with a voltage stabilizing diode ② 2, a second diode ② 3 is connected with a voltage stabilizing diode ② 4, a filter capacitor ② 5 is connected in parallel with two ends of the voltage stabilizing diode ② 6, and the two ends are power supplies V2.
Description
Technical Field
The invention relates to an isolation power supply, in particular to an isolation power supply without a transformer.
Background
Prior to the present invention, the drive of the MOSFETs and the powering of the isolated communication were powered using isolated DCDC technology. The isolation DCDC adopts a transformer coupling isolation technology, and the scheme has the following main defects:
I) the method comprises the following steps The magnetic isolation DCDC is designed by a high-frequency transformer which is composed of a magnetic core, a framework and a large number of copper wires.
II): the cost is high, and the magnetic isolation DCDC adopts a large amount of copper wires for winding.
III): the consistency is poor, and the consistency is poor because a high-frequency transformer adopted by the magnetic isolation DCDC is a fixed part and is influenced by a winding process and the like.
IV): the high-frequency transformer that the magnetic isolation DCDC adopted, transformer isolation technique have electricity, magnetism, electric conversion process, and conversion efficiency is lower, and under the same power consumption condition, the heating of magnetic isolation DCDC is great.
V): the electromagnetic interference is large, the high-frequency transformer adopted by the magnetic isolation DCDC works in a high-frequency switching state, larger delta I/delta t exists, the larger delta I/delta t is, the larger the generated electromagnetic radiation is, the larger the interference to other external devices is, in addition, when the transformer is designed, the short circuit of a magnetic circuit is prevented, a proper air gap can be opened in the magnetic circuit, and due to the existence of the air gap, a large amount of magnetic leakage can be generated at the same time, and the electromagnetic interference can also be generated to the external devices.
Disclosure of Invention
The invention aims to overcome the curve defect of the traditional transformer type isolation power supply, develop an isolation power supply without a transformer and thoroughly overcome the defect of the traditional magnetic isolation DCDC.
The technical scheme of the invention is as follows:
the transformer-free isolation power supply is characterized in that the output of a high-speed PWM generator ① is connected with a driver ②, the output of the driver ② powered by a power supply V1 is respectively connected with a first isolation capacitor ③ and a second isolation capacitor ④, a first isolation capacitor ③ is connected with a first diode ⑤, a second isolation capacitor ④ is connected with a first diode ⑤, the first diode ⑤ is connected with a second diode ② 0, the second diode ② 1 is connected with a voltage stabilizing diode ② 2, a second diode ② 3 is connected with a voltage stabilizing diode ② 4, a filter capacitor ② 5 is connected in parallel with two ends of the voltage stabilizing diode ② 6, and the two ends of the filter capacitor ② are respectively connected with the power supply V2.
The first isolation capacitor ③ is connected to the cathode of the first diode ⑤, the second isolation capacitor ④ is connected to the anode of the first diode ⑤, the cathode of the first diode ⑤ is connected to the anode of the second diode ⑥, the cathode of the second diode ⑥ is connected to the cathode of the zener diode ⑦, and the anode of the second diode ⑥ is connected to the anode of the zener diode ⑦.
The power supply V1 is connected to pins P1 and P2 of the driver ②.
The power supplies V2 and V1 are isolated by a second isolation capacitor ④ and a first isolation capacitor ③.
The transformer-free isolation power supply provided by the invention cancels the transformer, does not have magnetic leakage, effectively reduces the interference of peripheral devices, also has no design and calculation problems of the transformer because of canceling the transformer, and has larger improvement in volume compared with an isolation transformer type power supply. The transformer-free isolated power supply has strong expansibility, and only a proper number of expanded power supply output V3 modules need to be added under the condition that multiple paths of mutually isolated power supplies are needed.
Drawings
FIG. 1 is a schematic diagram of the circuit principle of the present invention.
Fig. 2 is a schematic diagram illustrating the current flow when the output of the high-speed PWM driver ① is "1" in the present invention.
Fig. 3 is a schematic diagram illustrating the current flow when the output of the high-speed PWM driver ① is "0" in the present invention.
FIG. 4 is a schematic diagram of the extended multiplex of the present invention.
The names of the components corresponding to the reference numerals in the figures are as follows:
high-speed PWM generator ①, driver ②, first isolation capacitor ③, second isolation capacitor ④, first diode ⑤, second diode ⑥, zener diode ⑦, and filter capacitor ⑧.
Detailed Description
As shown in fig. 1, 2, and 3:
the high-speed PWM generator ① mainly generates PWM signals, and has an output connected to the driver ②, the driver ② is powered by the power supply V1, the output of the driver ② is connected to the first isolation capacitor ③ and the second isolation capacitor ④, the first isolation capacitor ③ is connected to the K pin of the first diode ② 0, the second isolation capacitor ④ is connected to the a pin of the first diode ⑤, the K pin of the first diode ⑤ is connected to the a pin of the second diode ② 1, the a pin of the second diode ② 2 is connected to the a pin of the zener diode ② 3, the K pin of the second diode ② 4 is connected to the K pin of the zener diode ② 5, the filter capacitor ② 6 is connected in parallel to the two ends of the zener diode ② 7, and the power supply V2 is an isolated and polar power supply.
The high-speed PWM generator ① generates PWM signals, the driver ② improves the driving capability of the PWM signals and improves the voltage amplitude and current capability of the PWM signals, the first isolation capacitor ② 0 and the second isolation capacitor ② 1 play roles of isolating a V1 power supply and a V2 power supply, the first diode ⑤ plays a role of freewheeling, when the output of the high-speed PWM generator ① is '0', the V1 power supply charges the first isolation capacitor ③ and the second isolation capacitor ④, the second diode ⑥ plays a role of rectification, and by utilizing the characteristic of unidirectional conduction, the isolated direct current power supply V2 is generated at two ends of the filter capacitor ⑧, the V1 power supply and the negative electrodes of the V2 power supply are not in common connection, so that the V2 and the V1 are two isolated power supplies which are not electrically connected, and the isolation strength of the V1 and the V2 depends on the withstand voltage values of the first isolation capacitor ③ and the second isolation capacitor ④, and in different application occasions, the capacitors with different withstand voltage values can meet the application requirements.
The application process of the invention is briefly described as follows:
I) when the high-speed PWM generator ① outputs a logic level "0", which is amplified by the driver ② to generate a power voltage with a voltage amplitude of V1, the peak current reaches 5 amperes, and the pin D is positive, the pin C is negative, since the diodes have a single-phase conduction characteristic, the pin a of the first diode ⑤ is positive, the pin K is negative, the first diode ⑤ is forward-conducted, the pin K of the second diode ⑥ is positive, the pin a is negative, and the second diode ⑥ is reversely turned off, at this time, the power supply V1 charges the first isolation capacitor ② and the second isolation capacitor ② 0 through the first diode ⑤ to form a charging loop, see fig. 2, as the charging time extends, the sum of the voltages of the first isolation capacitor ③ and the second isolation capacitor ② is equal to the power voltage V1, at this time, the left pin of the second isolation capacitor ④ is positive, the right pin is negative, the left pin of the first isolation capacitor ③ is negative, and the right pin is a filtering voltage V ② after the stable voltage stage of the power supply V2.
II), when the high-speed PWM generator ① outputs logic level '1', the logic level generates a PWM signal with voltage amplitude of V1 power voltage through the amplification of the driver ②, the peak current reaches 5 amperes, the pin D is negative, the pin C is positive, because the diode has single-phase conduction characteristic, the pin A of the first diode ⑤ is negative, the pin K is positive, the first diode ⑤ is cut off in reverse direction, the pin K of the second diode ⑥ is negative, the pin A is positive, the second diode ⑥ is conducted in forward direction, the first isolation capacitor ③, the second isolation capacitor ④ and the power V1 form a series relation, the first diode ⑥ which is conducted in forward direction charges the filter capacitor ⑧, the voltage stabilizing diode ② 0 plays a role in limiting the voltage amplitude of the isolation power V2, and the amplitude of the isolation power V2 exceeds the breakdown voltage of the voltage stabilizing diode ② 1, and the isolation power V2 is limited in the amplitude of the breakdown voltage.
III), the high-speed PWM generator ① alternates continuously between "0" and "1", so that the isolated power supply of the present invention continues to cycle through steps I), II), and finally across the filter capacitor ⑧, a stable isolated power supply V2 is produced.
In this example, the MCU or a dedicated PWM chip is used as the high-speed PWM generator ①, the isolated power supply V2 is generated by the circuit of the present invention, and the isolated power supply V2 is used as a MOSFET driving power supply or an isolated communication power supply, so that the voltage value of the zener diode ⑦ can be changed to adjust the output voltage of the V2 power supply, and the voltage value of the first isolation capacitor ③ and the second isolation capacitor ④ can be changed to meet the operating requirements under the requirement of different isolation strengths.
In addition, in the use case of needing multi-path isolation power supply, only the expansion power supply part device is needed to be added to generate other isolation power supply V3 (figure (4)).
Claims (4)
1. The transformer-free isolated power supply is characterized in that the output of a high-speed PWM generator ① is connected with a driver ②, the output of the driver ② powered by a power supply V1 is respectively connected with a first isolation capacitor ③ and a second isolation capacitor ④, a first isolation capacitor ③ is connected with a first diode ⑤, a second isolation capacitor ④ is connected with the other end of a first diode ⑤, the first diode ⑤ is connected with a second diode ② 0, a second diode ② 1 is connected with a voltage stabilizing diode ② 2, a filter capacitor ② 3 is connected in parallel with two ends of a voltage stabilizing diode ② 4, and two ends of the filter capacitor ② are respectively connected with a power supply V2.
2. The isolated transformer-less power supply of claim 1, wherein the first isolation capacitor ③ is coupled to the cathode of a first diode ⑤, the second isolation capacitor ④ is coupled to the anode of the first diode ⑤, the cathode of the first diode ⑤ is coupled to the anode of a second diode ⑥, the cathode of the second diode ⑥ is coupled to the cathode of the zener diode ⑦, and the anode of the second diode ⑥ is coupled to the anode of the zener diode ⑦.
3. The transformerless isolated power supply of claim 1 wherein the source V1 is connected at pins P1 and P2 of driver ②.
4. The isolated transformer-less power supply of claim 1, wherein the power supplies V2 and V1 are isolated from each other by a second isolation capacitor ④ and a first isolation capacitor ③.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910990826.XA CN110719023A (en) | 2019-10-16 | 2019-10-16 | Isolation power supply without transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910990826.XA CN110719023A (en) | 2019-10-16 | 2019-10-16 | Isolation power supply without transformer |
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| Publication Number | Publication Date |
|---|---|
| CN110719023A true CN110719023A (en) | 2020-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910990826.XA Pending CN110719023A (en) | 2019-10-16 | 2019-10-16 | Isolation power supply without transformer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053154A (en) * | 1989-05-18 | 1991-07-17 | 中野博民 | Switch power supply equipment and partition method thereof |
| US5134307A (en) * | 1989-05-18 | 1992-07-28 | Hirotami Nakano | Uninterruptible power supply apparatus and isolating method thereof |
| CN202026494U (en) * | 2010-09-20 | 2011-11-02 | 浙江大学 | Capacity isolation multi-path constant current output resonant mode direct current/direct current transformer |
| CN102510224A (en) * | 2011-11-23 | 2012-06-20 | 广州金升阳科技有限公司 | Power supply circuit |
| CN106712542A (en) * | 2015-07-31 | 2017-05-24 | 常州明石晶电科技有限公司 | Switching power supply |
-
2019
- 2019-10-16 CN CN201910990826.XA patent/CN110719023A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053154A (en) * | 1989-05-18 | 1991-07-17 | 中野博民 | Switch power supply equipment and partition method thereof |
| US5134307A (en) * | 1989-05-18 | 1992-07-28 | Hirotami Nakano | Uninterruptible power supply apparatus and isolating method thereof |
| CN202026494U (en) * | 2010-09-20 | 2011-11-02 | 浙江大学 | Capacity isolation multi-path constant current output resonant mode direct current/direct current transformer |
| CN102510224A (en) * | 2011-11-23 | 2012-06-20 | 广州金升阳科技有限公司 | Power supply circuit |
| CN106712542A (en) * | 2015-07-31 | 2017-05-24 | 常州明石晶电科技有限公司 | Switching power supply |
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