CN111130086B - Power supply system safety potential protection circuit - Google Patents
Power supply system safety potential protection circuit Download PDFInfo
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- CN111130086B CN111130086B CN201911362442.XA CN201911362442A CN111130086B CN 111130086 B CN111130086 B CN 111130086B CN 201911362442 A CN201911362442 A CN 201911362442A CN 111130086 B CN111130086 B CN 111130086B
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- potential protection
- voltage
- ground
- protection unit
- resistor
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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
Abstract
The invention discloses a power supply system safety potential protection circuit, which improves the shock resistance of a high-voltage power supply system and the adaptability of input voltage by adding a buffer network and a potential protection unit, can calculate the parameter value of each element in the protection circuit according to the current impact condition to be endured, and can be suitable for the potential protection of different high-voltage (0-5kV) power supply systems; in addition, the bidirectional potential protection unit is additionally arranged between the high-voltage output ground and the shell ground, so that high-power bidirectional potential protection of the high-voltage power supply system can be realized, and the requirements of high reliability and strong impact resistance of the high-voltage power supply system in practical application can be met.
Description
Technical Field
The invention belongs to the technical field of special switching power supplies, and particularly relates to a safety potential protection circuit of a power supply system.
Background
On the satellite, the power distribution system transforms and distributes the electric energy provided by the bus to each electric device according to the power utilization requirement of each load of the spacecraft. The converter is the most important part in a power distribution system, and mainly has the main function of converting primary bus voltage of various spacecrafts such as satellites and spacecrafts into voltage required by various satellite subsystems and equipment in ground test and in-orbit operation stages for satellite electronic equipment. Due to the different loads of the spacecraft, the required supply voltages also vary greatly. Also, due to the diversity of the loads, there is diversity in the output return (ground) of the converter.
There are many grounds on satellites, and the grounds associated with the transducers fall into 3 major categories, including: the satellite is arranged on the shell ground, and the total ground wire of the satellite is connected with the shell of the satellite; the input ground of a converter in the power distribution system; the output return (output ground) of the converter in the power distribution system, i.e. the supply loop of the load. There are many different situations between the output ground of the converter and the chassis ground of the satellite due to the different loads connected. When the output of the converter is high voltage or the output return line needs to be isolated from the chassis ground due to other special reasons, a large potential difference between the output ground and the chassis ground due to electrostatic accumulation may exist. In addition to this, when the output of the high-voltage converter is short-circuited, although the power supply is protected and cut off, a large potential difference exists between the output ground and the chassis ground. In this case, a circuit is required to be added between the output ground and the chassis ground to clamp the voltage between the output ground and the chassis ground.
The design of the potential protection circuit is carried out by adopting a resistance-capacitance or diode in the traditional design, the protection performance of the potential protection circuit often cannot achieve the expected effect, and the damage of a product or a system is caused.
Disclosure of Invention
In view of the above, the present invention provides a safety potential protection circuit for a power system, which can provide safety potential protection between an output ground of a high voltage power system and a chassis ground.
The invention provides a power supply system safety potential protection circuit, which comprises a buffer network and a potential protection unit, wherein the buffer network is formed by connecting RC circuits in series, is connected between a high-voltage output ground and a shell ground in series and is used for buffering voltage shock between the high-voltage output ground and the shell ground under the transient condition; two end points of the potential protection unit are connected in series between the high-voltage output ground and the machine shell ground and used for limiting the voltage between the high-voltage output ground and the machine shell ground within a set voltage range;
the potential protection unit comprises a resistor R3, a resistor R4, a voltage regulator tube V5, a voltage regulator tube V8, a field effect transistor Q2, a diode V6 and a diode V7, wherein one end of the resistor R4 is connected with a first end point of the potential protection unit, and the other end of the resistor R4 is connected with a resistor R3 in series and then connected with a gate of the field effect transistor Q2; the anode of the voltage regulator tube V5 is connected with the first end point, and the cathode of the voltage regulator tube V5 is connected with the grid of the field effect transistor Q2; the source electrode of the field effect transistor Q2 is connected with the first terminal, the drain electrode of the field effect transistor Q2 is connected with the cathode electrode of the diode V6, and the anode electrode of the diode V6 is connected with the second terminal of the potential protection unit; the other end of the resistor R4 is connected with the anode of a voltage regulator tube V8, the cathode of the voltage regulator tube V8 is connected with the cathode of a diode V7, and the anode of the diode V7 is connected with the second end point.
Further, the potential protection units are two potential protection units connected in parallel, and are respectively a first potential protection unit and a second potential protection unit; the first end point of the first potential protection unit is connected with a high-voltage output ground, and the second end point of the first potential protection unit is connected with a machine shell ground; the first end point of the second potential protection unit is connected with the shell ground, and the second end point of the second potential protection unit is connected with the high-voltage output ground.
Has the advantages that:
the invention improves the shock resistance of a high-voltage power supply system and the adaptability of input voltage by adding the buffer network and the potential protection unit, can calculate the parameter value of each element in the protection circuit according to the current impact condition to be endured, and is suitable for potential protection of different high-voltage (0-5kV) power supply systems; in addition, the bidirectional potential protection unit is additionally arranged between the high-voltage output ground and the shell ground, so that high-power bidirectional potential protection of the high-voltage power supply system can be realized, and the requirements of high reliability and strong impact resistance of the high-voltage power supply system in practical application can be met.
Drawings
Fig. 1 is a schematic structural diagram of a power system safety potential protection circuit provided in the present invention.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a power system safety potential protection circuit, as shown in fig. 1, comprising a buffer network and a potential protection unit, wherein the buffer network is formed by connecting RC circuits in series, and the buffer network is connected between a high-voltage output ground and a shell ground in series and is used for buffering voltage shock between the high-voltage output ground and the shell ground under the transient condition; two end points of the potential protection unit are connected in series between the high-voltage output ground and the shell ground, and are used for limiting the voltage between the high-voltage output ground and the shell ground within a set voltage range, and calculating parameter values of each element in the protection circuit according to the current impact condition to be endured.
The buffer network buffers sudden voltage changes between a high-voltage output ground and a shell ground under the transient condition, damage to a power supply system caused by sudden high-voltage changes is prevented, and a resistor in the buffer network has a voltage-sharing effect, so that damage to a capacitor caused by uneven voltage division between two capacitors is prevented.
The potential protection unit comprises an electronic switch, a clamping voltage breakdown circuit and a current direction limiting circuit, and specifically comprises:
the electronic switch consists of a field effect transistor Q1, a resistor R1, a resistor R2 and a voltage regulator tube V1 (or a field effect transistor Q2, a resistor R3, a resistor R4 and a voltage regulator tube V5), wherein the field effect transistor additionally arranged on an input positive line is equivalent to the electronic switch, and the field effect transistor is slowly conducted by controlling the grid voltage of the N-channel field effect transistor, so that the aim of connecting a high-voltage output ground and a shell ground is fulfilled;
the clamping voltage breakdown circuit is a voltage regulator tube V4 (or a voltage regulator tube V8), the voltage regulator tube is adopted to limit the maximum voltage difference between a high-voltage output ground and a machine shell ground, when the voltage difference between the high-voltage output ground and the machine shell ground exceeds the voltage of the voltage regulator tube, the MOSFET starts to be gradually conducted, and the voltage difference between the two grounds is reduced;
the current direction limiting circuit consists of a diode V2 and a diode V3 (or a diode V6 and a diode V7), and limits the leakage direction of current.
Considering that there may be two kinds of situations due to the polarity of the voltage difference, two symmetrical potential protection units are adopted to respectively discharge the voltage difference in two polarity directions, so that high-power bidirectional potential protection can be provided for a high-voltage power supply system, the symmetrical potential protection units are respectively a first potential protection unit and a second potential protection unit, a first end of the first potential protection unit is connected with a high-voltage output ground, a second end of the first potential protection unit is connected with a casing ground, and a first end of the second potential protection unit is connected with the casing ground, and a second end of the second potential protection unit is connected with the high-voltage output ground, specifically:
the first potential protection unit comprises a resistor R3, a resistor R4, a voltage regulator tube V5, a voltage regulator tube V8, a field effect transistor Q2, a diode V6 and a diode V7, wherein one end of the resistor R4 is connected with a first endpoint, and the other end of the resistor R4 is connected with a resistor R3 in series and then connected with the grid electrode of the field effect transistor Q2; the anode of the voltage regulator tube V5 is connected with the first end point, and the cathode of the voltage regulator tube V5 is connected with the grid of the field effect transistor Q2; the source of the field effect transistor Q2 is connected with the first terminal, the drain of the field effect transistor Q2 is connected with the cathode of the diode V6, and the anode of the diode V6 is connected with the second terminal; the other end of the resistor R4 is connected with the anode of a voltage regulator tube V8, the cathode of a voltage regulator tube V8 is connected with the cathode of a diode V7, and the anode of the diode V7 is connected with a second endpoint;
the second potential protection unit comprises a resistor R1, a resistor R2, a voltage regulator tube V1, a voltage regulator tube V4, a field effect transistor Q1, a diode V2 and a diode V3, wherein one end of the resistor R2 is connected with a first endpoint, and the other end of the resistor R2 is connected with a resistor R1 in series and then connected with the grid electrode of the field effect transistor Q1; the anode of the voltage regulator tube V1 is connected with the first end point, and the cathode of the voltage regulator tube V1 is connected with the grid of the field effect transistor Q1; the source of the field effect transistor Q1 is connected with the first terminal, the drain of the field effect transistor Q1 is connected with the cathode of the diode V2, and the anode of the diode V3 is connected with the second terminal; the other end of the resistor R2 is connected with the anode of a voltage regulator tube V4, the cathode of the voltage regulator tube V4 is connected with the cathode of a diode V3, and the anode of the diode V3 is connected with a second end point.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A power system safety potential protection circuit is characterized by comprising a buffer network and a potential protection unit, wherein the buffer network is formed by connecting RC circuits in series, and the buffer network is connected between a high-voltage output ground and a shell ground in series and is used for buffering voltage shock between the high-voltage output ground and the shell ground under the transient condition; two end points of the potential protection unit are connected in series between the high-voltage output ground and the machine shell ground and used for limiting the voltage between the high-voltage output ground and the machine shell ground within a set voltage range;
the potential protection unit comprises a resistor R3, a resistor R4, a voltage regulator tube V5, a voltage regulator tube V8, a field effect transistor Q2, a diode V6 and a diode V7, wherein one end of the resistor R4 is connected with a first end point of the potential protection unit, and the other end of the resistor R4 is connected with a resistor R3 in series and then connected with a gate of the field effect transistor Q2; the anode of the voltage regulator tube V5 is connected with the first end point, and the cathode of the voltage regulator tube V5 is connected with the grid of the field effect transistor Q2; the source electrode of the field effect transistor Q2 is connected with the first terminal, the drain electrode of the field effect transistor Q2 is connected with the cathode electrode of the diode V6, and the anode electrode of the diode V6 is connected with the second terminal of the potential protection unit; the other end of the resistor R4 is connected with the anode of a voltage regulator tube V8, the cathode of a voltage regulator tube V8 is connected with the cathode of a diode V7, and the anode of the diode V7 is connected with the second end point;
the potential protection units are two potential protection units which are connected in parallel and are respectively a first potential protection unit and a second potential protection unit; the first end point of the first potential protection unit is connected with a high-voltage output ground, and the second end point of the first potential protection unit is connected with a machine shell ground; the first end point of the second potential protection unit is connected with the shell ground, and the second end point of the second potential protection unit is connected with the high-voltage output ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911362442.XA CN111130086B (en) | 2019-12-26 | 2019-12-26 | Power supply system safety potential protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911362442.XA CN111130086B (en) | 2019-12-26 | 2019-12-26 | Power supply system safety potential protection circuit |
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| CN111130086A CN111130086A (en) | 2020-05-08 |
| CN111130086B true CN111130086B (en) | 2022-03-25 |
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| CN113541116B (en) * | 2021-08-03 | 2023-11-10 | 北京控制工程研究所 | Voltage clamping circuit and system based on power MOS |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203415975U (en) * | 2013-08-20 | 2014-01-29 | 中国大唐集团财务有限公司 | Two-way surge protection circuit |
| CN104409456A (en) * | 2014-11-28 | 2015-03-11 | 中国科学院上海微系统与信息技术研究所 | SOI ESD two-stage protection network |
| CN106786353A (en) * | 2016-12-13 | 2017-05-31 | 京信通信技术(广州)有限公司 | A kind of overvoltage crowbar |
| CN108400578B (en) * | 2017-02-08 | 2020-06-30 | 钜泉光电科技(上海)股份有限公司 | High-voltage ESD protection circuit |
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