CN114362094A - Overcurrent protection circuit for fast recovery high-voltage power supply system - Google Patents
Overcurrent protection circuit for fast recovery high-voltage power supply system Download PDFInfo
- Publication number
- CN114362094A CN114362094A CN202111577889.6A CN202111577889A CN114362094A CN 114362094 A CN114362094 A CN 114362094A CN 202111577889 A CN202111577889 A CN 202111577889A CN 114362094 A CN114362094 A CN 114362094A
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistor
- power supply
- current
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention belongs to the power electronic technology, and particularly relates to an overcurrent protection circuit for a fast recovery high-voltage power supply system. The current measuring circuit, the pre-stage filter circuit, the current comparison circuit, the monostable trigger circuit, the gate circuit and the post-stage filter circuit are sequentially connected in series; compared with the existing overcurrent protection technology applied to a high-voltage power supply system, the RC filter circuits are added at the front stage and the rear stage of the overcurrent protection circuit, so that interference signals are superposed on output signals of overcurrent protection in a strong electric field working environment, and overcurrent input signals are transmitted to a control system without distortion. The overcurrent protection of the fast recovery high-voltage power supply system can be met by designing the values of the timing capacitor and the timing resistor of the monostable trigger, and the adjustable timing resistor is adopted, so that the overcurrent maintenance time of the fast recovery high-voltage power supply system can be adjusted within 1-2 ms, the overcurrent protection circuit board is prevented from being continuously replaced due to different system requirements, and the economic benefit is increased.
Description
Technical Field
The invention belongs to the power electronic technology, and particularly relates to an overcurrent protection circuit for a fast recovery high-voltage power supply system.
Background
The high-power high-voltage power supply is an important part of an auxiliary heating system in a magnetic confinement fusion device, and a matched auxiliary heating system also puts forward new requirements along with the establishment of a Chinese circulator No. two M (HL-2M) device. The neutral beam injection system is easy to generate a sparking (short circuit) phenomenon in the heating process, and once sparking occurs, the high-voltage power supply system can close a switch of the power supply system so as to protect the safety of a load. The conventional need is that the high voltage power supply system will not be activated after a strike has occurred, while the improved neutral beam injection system requires that the high voltage power supply be restarted within a few milliseconds after the strike, thereby placing new demands on the over current protection circuitry of the high voltage power supply system. The overcurrent protection circuit for the fast recovery high-voltage power supply system is required to recover the initial state after the output current value of the high-voltage power supply system exceeds the set protection value for 1-2 ms, and the overcurrent maintaining time is 1-2 ms.
The traditional overcurrent protection circuit has the defects of long maintenance time, immobility, incapability of effectively adjusting an overcurrent protection value, no movement caused by the use of the overcurrent protection circuit in a strong magnetic field in a high-voltage environment and the like, and cannot adapt to the overcurrent protection of a fast recovery high-voltage power supply system. The high-voltage power supply system realizes that the output of the high-voltage power supply system is quickly cut off when the high-voltage power supply system is ignited through an output signal of the overcurrent protection circuit through the control system, so that the overcurrent protection circuit is required to have high reliability, good follow-up performance and quick response. A new overcurrent protection circuit is required to solve the above-described problems.
Disclosure of Invention
The invention aims to provide an overcurrent protection circuit for a fast recovery high-voltage power supply system, which has high reliability, good following performance and fast response.
The technical scheme of the invention is as follows:
the over-current protection circuit for the fast recovery high-voltage power supply system comprises a current measuring circuit, a preceding stage filter circuit, a current comparison circuit, a monostable trigger circuit, a gate circuit and a post-stage filter circuit which are sequentially connected in series;
the current measuring circuit converts the measured current into a voltage signal;
the pre-stage filter circuit filters the voltage signal to form an input signal of the current comparison circuit;
the current comparison circuit compares the voltage signal input into the current comparison circuit with a voltage set value in the comparator to form an input signal of the monostable trigger circuit;
the monostable trigger circuit comprises a monostable trigger, and when the output signal changes, the monostable trigger is triggered at the rising edge of the signal to maintain the time of the overcurrent protection signal;
the gate circuit and the post-stage filter circuit carry out NAND operation on the signal output by the monostable trigger and the gate circuit, output a level signal and then filter the level signal to form an output signal of the overcurrent protection circuit.
The current measuring circuit comprises a current Hall sensor and a measuring resistor which are connected; the pre-stage filter circuit comprises a pre-stage filter resistor connected with the output end of the current Hall sensor, a pre-stage filter capacitor and a voltage stabilizing diode which are connected in parallel with the output end of the pre-stage filter resistor, and the pre-stage filter capacitor and the voltage stabilizing diode are both grounded.
The current-current comparison circuit comprises a comparator, two paths of parallel resistors R1 and R2 connected with two input ends of the comparator, a pull-up resistor connected with an output end and a power supply end of the comparator, and a monolithic capacitor and an electrolytic capacitor respectively connected with the power supply end of the comparator; the monolithic capacitor and the electrolytic capacitor are respectively grounded; the input end of the monolithic capacitor is connected with the output end of the preceding stage filter resistor.
The current and current comparison circuit comprises an adjustable resistor, the adjustable resistor is connected with the resistor R1 in series, and the adjustable resistor is grounded.
The monostable trigger circuit comprises a grounded monostable trigger, a timing resistor connected to an external timing resistor end of the monostable trigger, a timing capacitor connected in parallel between the external timing resistor end and an external timing capacitor end of the monostable trigger, and a monolithic capacitor and an electrolytic capacitor which are respectively connected to a power supply end of the monostable trigger in a grounded state; the input end of the monostable trigger is connected with the output end of the comparator.
The timing resistor is connected with a power supply.
The gate circuit and the post-stage filter circuit comprise a NAND gate, a pull-up resistor and a post-stage filter capacitor which are connected in series, and further comprise a pull-up resistor, a monolithic capacitor and an electrolytic capacitor; one end of the pull-up resistor is connected with the output end of the NAND gate, and the other end of the pull-up resistor is respectively connected with the monolithic capacitor and the electrolytic capacitor; the post-stage filter capacitor, the monolithic capacitor and the electrolytic capacitor are all grounded; the input end of the NAND gate is connected with the output end of the monostable trigger.
The invention has the following remarkable effects:
compared with the existing overcurrent protection technology applied to a high-voltage power supply system, the RC filter circuits are added at the front stage and the rear stage of the overcurrent protection circuit, so that interference signals are superposed on output signals of overcurrent protection in a strong electric field working environment, and overcurrent input signals are transmitted to a control system without distortion.
The overcurrent protection of the fast recovery high-voltage power supply system can be met by designing the values of the timing capacitor and the timing resistor of the monostable trigger, and the adjustable timing resistor is adopted, so that the overcurrent maintenance time of the fast recovery high-voltage power supply system can be adjusted within 1-2 ms, the overcurrent protection circuit board is prevented from being continuously replaced due to different system requirements, and the economic benefit is increased.
And an adjustable resistor is adopted for the overcurrent protection value, and the overcurrent protection current value can be adjusted in a larger range. The power supply for the chip components in the circuit is added with the electrolytic capacitor and the monolithic capacitor and distributed at two ends of the chip, so that interference signals caused by power supply ends can be effectively reduced.
Drawings
FIG. 1 is a schematic diagram of an over-current protection circuit for a fast recovery high voltage power supply system;
FIG. 2 is a diagram of a current measurement and pre-filter circuit;
FIG. 3 is a diagram of an overcurrent protection comparison circuit;
FIG. 4 is a diagram of a rising edge triggered monostable flip-flop circuit;
FIG. 5 is a block diagram of a gate and post-filter circuit;
in the figure: 1-a current measuring circuit; 2-a preceding stage filter circuit; 3-a current comparison circuit; 4-monostable trigger circuit; 5-gate circuit and post-stage filter circuit; 6-current hall sensor; 7, measuring the resistance; 8, a preceding stage filter resistor; 9-a preceding stage filter capacitor; 10-a zener diode; 11-voltage regulating resistance; 12-monolithic capacitors; 13-electrolytic capacitor; 14-pull-up resistor; 15-a comparator; 16-timing capacitor; 17-timing resistance; 18-monostable flip-flop; 19-post filter resistance; 20-a post-stage filter capacitor; 21-nand gate.
Detailed Description
The invention is further illustrated by the accompanying drawings and the detailed description.
As shown in fig. 1, the overcurrent protection circuit for a fast recovery high-voltage power supply system includes a current measurement circuit 1, a pre-stage filter circuit 2, a current comparison circuit 3, a monostable trigger circuit 4, a gate circuit and a post-stage filter circuit 5, which are connected in sequence;
the output end of the previous module and the input end of the next module in all the modules are connected to form an integral series structure, and the output end of the previous module and the input end of the next module are marked by the same letter symbols.
The current measured by the current measuring circuit 1 is converted into a voltage signal, the voltage signal passes through the pre-stage filter circuit 2 to form a voltage signal of an output comparator, the input voltage signal is compared with a voltage comparison value set in the current comparison circuit 3, when the voltage comparison value set by the high voltage of the input voltage signal is input, the comparator outputs a high level, the signal output by the comparator forms an output signal with a certain time through the monostable trigger circuit 4, the level time of the output signal is determined by the values of the timing capacitor 16 and the timing resistor 17, the output signal of the monostable trigger circuit 4 is connected with the gate circuit and the post-stage filter circuit 5, finally, an optical signal is formed by electric conversion light and transmitted to the control system, and whether the current is over current is judged.
As shown in fig. 2, the current measuring circuit 1 includes a current hall sensor 6 and a measuring resistor 7 connected, and an output terminal of the current hall sensor 6 is denoted as Uc; wherein the measuring resistor 7 is connected to ground;
the pre-stage filter circuit 2 comprises a pre-stage filter resistor 8 connected with the output end of the current Hall sensor 6, a pre-stage filter capacitor 9 and a voltage stabilizing diode 10 which are connected in parallel with the output end of the pre-stage filter resistor 8, and both the pre-stage filter capacitor 9 and the voltage stabilizing diode 10 are grounded;
the input end of the preceding filter circuit 2 is marked as the output end of the current hall sensor 6, and the output end of the preceding filter circuit 2, which is the output end of the preceding filter resistor 8, is marked as Uin.
The current measuring circuit 1 and the preceding stage filter circuit 2 adopt a current Hall sensor 6 to measure the current value of the fast recovery high-voltage power supply system, and the output current of the current Hall sensor 6 is connected with a measuring resistor 7 in series to form a voltage signal; the pre-filter capacitor 9 is connected in parallel with the zener diode 10, the formed parallel loop is connected in series with the pre-filter resistor 8, and the formed overall loop is connected in parallel with the measuring resistor 7.
As shown in fig. 3, the current-current comparison circuit 3 includes a comparator 15, two parallel resistors R1 and R2 connected to two input terminals of the comparator 15, an adjustable resistor 11 connected in series with the resistor R1, a pull-up resistor 14 connected to an output terminal and a power supply terminal of the comparator 15, and a monolithic capacitor 12 and an electrolytic capacitor 13 respectively connected to the power supply terminal of the comparator 15; wherein, the monolithic capacitor 12, the electrolytic capacitor 13 and the adjustable adjusting resistor 11 are respectively grounded; the adjustable resistor 11 is connected with a power supply in series;
the output end of the current comparison circuit 3 is the input end of the monolithic capacitor 12 and is marked as Uin, and the output end of the current comparison circuit is the output end of the comparator 15 and is marked as Uo;
the current comparison circuit 3 compares the value of the input voltage with the voltage set value in the comparator, and the voltage set value is set by adjusting the adjustable resistor 11. One end of an adjustable resistor 11 is connected with a power supply in series, the other end of the adjustable resistor 11 is connected with the ground, a sliding arm of the adjustable resistor 11 is connected with a resistor R1 in series, the adjustable resistor is connected with a comparator 15, an input voltage signal is connected with a resistor R2 in series, the adjustable resistor 11 is connected with the comparator, the power supply of the comparator is connected with the ground through a monolithic capacitor 12, the compared power supply is connected with the ground through an electrolytic capacitor 13, and the power supply of the comparator is connected with the ground through two capacitors, so that the phenomenon that an interference signal caused by a power supply end is superposed into an original input signal to cause interference of an output signal is reduced. The power supply is connected to the output of comparator 15 through pull-up resistor 14.
As shown in fig. 4, the monostable trigger circuit 4 includes a monostable flip-flop 18 connected to ground, a timing resistor 17 connected to an external timing resistor terminal of the monostable flip-flop 18, a timing capacitor 16 connected in parallel between the external timing resistor terminal of the monostable flip-flop 18 and an external timing capacitor terminal, and a monolithic capacitor 12 and an electrolytic capacitor 13 connected to ground at a power supply terminal of the monostable flip-flop 18, respectively;
wherein the timing resistor 17 is connected with a power supply;
the input end of the monostable trigger circuit 4 is the input end of the monostable trigger 18 and is marked as UO, and the output end thereof is the output end of the monostable trigger 18 and is marked as-Q1;
the power supply in the monostable trigger circuit 4 is connected with a monostable trigger 18 through a timing resistor 17, the timing resistor 17 is connected with a timing capacitor 16 and then connected with the monostable trigger, the power supply of the monostable trigger 18 is connected with the ground through two capacitors like the power supply of a comparator, and the interference brought to a chip by the power supply is eliminated. The monostable 18 realizes the time for maintaining the overcurrent protection signal through the values of the timing capacitor 16 and the timing resistor 17, the output signal of the comparator 15 changes, the monostable 18 triggers on the rising edge of the signal, so that the output signal of the monostable 18 changes, and the maintaining time of the output level is the timing time of the monostable 18.
As shown in FIG. 5, the gate circuit and the post-stage filter circuit 5 comprise a NAND gate 21, a pull-up resistor 14 and a post-stage filter capacitor 20 connected in series, and further comprise a pull-up resistor 14, a monolithic capacitor 12 and an electrolytic capacitor 13,
Wherein, one end of the pull-up resistor 14 is connected with the output end of the NAND gate 21, and the other end is respectively connected with the monolithic capacitor 12 and the electrolytic capacitor 13;
the NAND gate 21 is provided with two input ends, and the power end and one of the input ends of the NAND gate 21 are connected with a power supply; the other input end of the NAND gate 21 is taken as an integral input end and is marked as-Q1;
the post-stage filter capacitor 20, the monolithic capacitor 12 and the electrolytic capacitor 13 are all grounded;
the integral output end of the gate circuit and the post-stage filter circuit 5 is-Q1, and the output end is U;
the gate circuit and the post-stage filter circuit 5 perform NAND operation on a signal output by the monostable trigger 18 and the output level signal of the monostable trigger is filtered to form an output signal of an overcurrent protection circuit, and the output signal is transmitted to a control system through electro-optic conversion. The power supply of the gate circuit and the later stage filter circuit and one input of the NAND gate are connected with the power supply, the power supply is connected with the ground through two capacitors, the power supply is connected with the pull-up resistor 14 in series, the pull-up resistor 14 is connected with the output of the NAND gate 21, the output of the NAND gate 21 is connected with one end of the later stage filter resistor 19, the other end of the later stage filter resistor 19 is connected with the later stage filter capacitor 20, the later stage filter capacitor 20 is connected with the ground, and the output signal of the overcurrent protection is the connection position of the later stage filter resistor 19 and the later stage filter capacitor 20.
Claims (7)
1. A overcurrent protection circuit for recovering high voltage power supply system soon, its characterized in that: the device comprises a current measuring circuit (1), a pre-stage filter circuit (2), a current comparison circuit (3), a monostable trigger circuit (4), a gate circuit and a post-stage filter circuit (5) which are sequentially connected in series;
the current measuring circuit (1) converts the measured current into a voltage signal;
the pre-stage filter circuit (2) filters the voltage signal to form an input signal of the current comparison circuit (3);
the current comparison circuit (3) compares the voltage signal input into the current comparison circuit with a voltage set value in the comparator to form an input signal of the monostable trigger circuit (4);
the monostable trigger circuit (4) comprises a monostable trigger (18), when the output signal changes, the monostable trigger (18) is triggered at the rising edge of the signal, and the time of the overcurrent protection signal is maintained;
the gate circuit and the post-stage filter circuit (5) perform NAND operation on a signal output by the monostable trigger (18) and the gate circuit, output a level signal and filter the level signal to form an output signal of the overcurrent protection circuit.
2. The overcurrent protection circuit for a fast recovery high-voltage power supply system as set forth in claim 1, wherein: the current measuring circuit (1) comprises a current Hall sensor (6) and a measuring resistor (7) which are connected; the pre-stage filter circuit (2) comprises a pre-stage filter resistor (8) connected with the output end of the current Hall sensor (6), a pre-stage filter capacitor (9) and a voltage stabilizing diode (10) which are connected with the output end of the pre-stage filter resistor (8) in parallel, and the pre-stage filter capacitor (9) and the voltage stabilizing diode (10) are both grounded.
3. The overcurrent protection circuit for a fast recovery high-voltage power supply system as set forth in claim 2, wherein: the current-current comparison circuit (3) comprises a comparator (15), two paths of parallel resistors R1 and R2 connected with two input ends of the comparator (15), a pull-up resistor (14) connected with an output end and a power supply end of the comparator (15), and a monolithic capacitor (12) and an electrolytic capacitor (13) which are respectively connected with the power supply end of the comparator (15); the monolithic capacitor (12) and the electrolytic capacitor (13) are respectively grounded; the input end of the monolithic capacitor (12) is connected with the output end of the pre-stage filter resistor (8).
4. The over-current protection circuit for a fast recovery high voltage power supply system of claim 3, wherein: the current and current comparison circuit (3) comprises an adjustable resistor (11), the adjustable resistor (11) is connected with a resistor R1 in series, and the adjustable resistor (11) is grounded.
5. The over-current protection circuit for a fast recovery high voltage power supply system of claim 3, wherein: the monostable trigger circuit (4) comprises a grounded monostable trigger (18), a timing resistor (17) connected to an external timing resistor end of the monostable trigger (18), a timing capacitor (16) connected between the external timing resistor end and an external timing capacitor end of the monostable trigger (18) in parallel, and a grounded monolithic capacitor (12) and an electrolytic capacitor (13) which are respectively connected to a power supply end of the monostable trigger (18); the input end of the monostable trigger (18) is connected with the output end of the comparator (15).
6. The over-current protection circuit for a fast recovery high voltage power supply system of claim 5, wherein: the timing resistor (17) is connected with a power supply.
7. The over-current protection circuit for a fast recovery high voltage power supply system of claim 5, wherein: the gate circuit and the post-stage filter circuit (5) comprise a NAND gate (21), a pull-up resistor (14) and a post-stage filter capacitor (20) which are connected in series, and further comprise a pull-up resistor (14), a monolithic capacitor (12) and an electrolytic capacitor (13); one end of the pull-up resistor (14) is connected with the output end of the NAND gate (21), and the other end of the pull-up resistor is respectively connected with the monolithic capacitor (12) and the electrolytic capacitor (13); the post-stage filter capacitor (20), the monolithic capacitor (12) and the electrolytic capacitor (13) are all grounded; the input end of the NAND gate (21) is connected with the output end of the monostable trigger (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111577889.6A CN114362094B (en) | 2021-12-22 | 2021-12-22 | Overcurrent protection circuit for fast recovery high-voltage power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111577889.6A CN114362094B (en) | 2021-12-22 | 2021-12-22 | Overcurrent protection circuit for fast recovery high-voltage power supply system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114362094A true CN114362094A (en) | 2022-04-15 |
| CN114362094B CN114362094B (en) | 2023-05-16 |
Family
ID=81101344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111577889.6A Active CN114362094B (en) | 2021-12-22 | 2021-12-22 | Overcurrent protection circuit for fast recovery high-voltage power supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114362094B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465245A (en) * | 2008-12-19 | 2009-06-24 | 上海电器科学研究所（集团）有限公司 | Device for preventing false action of low-voltage apparatus implement device |
| CN105356863A (en) * | 2015-09-29 | 2016-02-24 | 贵州剑星科技有限公司 | Fast recovery detection delay circuit with monostable characteristic |
| CN106169736A (en) * | 2016-09-30 | 2016-11-30 | 南京林业大学 | A kind of brshless DC motor quick rotation-clogging protection method and circuit |
-
2021
- 2021-12-22 CN CN202111577889.6A patent/CN114362094B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465245A (en) * | 2008-12-19 | 2009-06-24 | 上海电器科学研究所（集团）有限公司 | Device for preventing false action of low-voltage apparatus implement device |
| CN105356863A (en) * | 2015-09-29 | 2016-02-24 | 贵州剑星科技有限公司 | Fast recovery detection delay circuit with monostable characteristic |
| CN106169736A (en) * | 2016-09-30 | 2016-11-30 | 南京林业大学 | A kind of brshless DC motor quick rotation-clogging protection method and circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114362094B (en) | 2023-05-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102629751B (en) | Over-current protection circuit | |
| CN114362094B (en) | Overcurrent protection circuit for fast recovery high-voltage power supply system | |
| CN203708097U (en) | Novel switch power supply short circuit protection circuit | |
| CN203415955U (en) | Novel short-circuit protection circuit for switching power supply | |
| CN217156768U (en) | Circuit for monitoring load short circuit state | |
| CN205960624U (en) | Switch power -supply overvoltage protecting circuit | |
| CN212676883U (en) | Overcurrent protection and delay recovery circuit and power supply equipment | |
| CN114838635A (en) | Digital detonator detonation control interface overcurrent short-circuit protection circuit and control method | |
| CN208797826U (en) | A kind of short-circuit protection of external load | |
| CN210156915U (en) | Controllable time delay hiccup formula output short-circuit protection circuit of switching power supply | |
| CN200990142Y (en) | Voltage current collecting channel circuit | |
| CN108173251B (en) | Lightning protection circuit of alarm control system | |
| CN218352157U (en) | Overcurrent protection circuit for High Performance Liquid Chromatography (HPLC) communication fault diagnosis equipment | |
| CN110797982A (en) | Remote signaling acquisition method for distribution automation terminal | |
| CN205478068U (en) | Ignition module among ke luzi automobile ignition coil | |
| CN210348265U (en) | Simple PLC input isolation module | |
| CN218940939U (en) | Direct-current power supply slow start circuit | |
| CN220874507U (en) | String current detection circuit and photovoltaic inverter system | |
| CN218648724U (en) | Safe and reliable power supply circuit | |
| CN217692657U (en) | Fast protection circuit for switching power supply | |
| CN215867002U (en) | Relay adhesion detection circuit | |
| CN210577787U (en) | Protection circuit supporting hot plug and impact prevention | |
| CN219372011U (en) | Filter, lightning protection filter and aircraft with lightning protection overcurrent protection | |
| CN202841629U (en) | Solar energy boost LED driving power supply with protection function | |
| CN220457115U (en) | Microcomputer protection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |