CN112542819A - Under-voltage protection circuit - Google Patents
Under-voltage protection circuit Download PDFInfo
- Publication number
- CN112542819A CN112542819A CN202011381646.0A CN202011381646A CN112542819A CN 112542819 A CN112542819 A CN 112542819A CN 202011381646 A CN202011381646 A CN 202011381646A CN 112542819 A CN112542819 A CN 112542819A
- Authority
- CN
- China
- Prior art keywords
- capacitor
- resistor
- voltage
- circuit
- iron core
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/243—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for DC systems
Landscapes
- Rectifiers (AREA)
Abstract
The invention discloses an under-voltage protection circuit, which is characterized in that: the energy-saving type transformer comprises a capacitor C8, an energy storage filter circuit, a voltage comparison circuit and a switch device for controlling the on-off of an iron core coil, wherein the power supply inlet end is respectively connected with one end of a high-voltage-withstanding capacitor C8 and the anode of a rectifier diode D7, the other end of the capacitor C8 is connected with the J1 end of the iron core coil through a bridge rectifier circuit to realize a resistance-capacitance voltage reduction function, the cathode of a diode D7 is connected with the driving electrode of the switch device through the voltage comparison circuit, and the switch device is controlled through the output signal of the voltage comparison circuit to control the attraction and the. The invention uses simpler electronic components in the realization of the under-voltage protection function, and can realize the main under-voltage protection function only by using the simple combination of the capacitor, the diode, the switch tube and the iron core coil. The used device is simple, the reliability is higher, the power consumption is much lower than that of other common hardware schemes, and the heating problem of the power device and the coil is obviously improved.
Description
Technical Field
The invention relates to an undervoltage protection circuit, and belongs to the field of distribution circuit breakers.
Background
The undervoltage protection is mainly applied to a low-voltage distribution system, and aims to avoid undervoltage damage or burning of rear-end equipment caused by the reasons of neutral point conductor disconnection, reverse connection between a phase line and a neutral line at a user inlet end and the like, so that economic loss is caused to users or personal safety is directly endangered.
The existing under-voltage protection circuit has two main design schemes, one is to use an analog circuit and realize under-voltage protection by a voltage comparison mode. The scheme belongs to a hardware implementation scheme, has high universality but high power consumption, and is easy to damage a power device so as to cause the failure of an under-voltage protection function, and the power device is seriously heated; the other scheme is to realize under-voltage protection by using a resistance sampling and single chip microcomputer processing mode. The scheme belongs to a software implementation scheme, the cost is high, the circuit is complex, and voltage misjudgment and even functional failure can be caused if a software algorithm is in a problem.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing under-voltage protection circuit has the problems of large power consumption and high cost.
In order to solve the above problems, the technical solution of the present invention is to provide an under-voltage protection circuit, which is characterized in that: the high-voltage-withstanding voltage-reducing transformer comprises a capacitor C8, an energy storage filter circuit, a voltage comparison circuit and a switch device for controlling the on-off of an iron core coil, wherein the power supply inlet wire end is respectively connected with one end of a high-voltage-withstanding capacitor C8 and the anode of a rectifier diode D7, the power supply input end is connected with a piezoresistor RV1 in parallel, the other end of the capacitor C8 is connected with the J1 end of the iron core coil through a bridge rectifier circuit to realize a resistance-capacitance voltage-reducing function, and the energy storage filter circuit is connected between the bridge rectifier circuit and the J;
the cathode of the diode D7 is connected with the driving pole of the switching device through the voltage comparison circuit, one end of the switching device is connected with the J3 end of the iron core coil, and the other end of the switching device is grounded; the voltage comparison circuit outputs signals to control the on and off of the switching device, so that the attraction and the disconnection of the iron core coil are controlled.
Preferably, the energy storage filter circuit comprises a capacitor C6 and a capacitor C7 which are connected in parallel, one end of the capacitor C6 and one end of the capacitor C7 are connected with the output end of the bridge rectifier circuit, and the other end of the capacitor C6 and the other end of the capacitor C7 are grounded.
Preferably, the voltage comparison circuit comprises an operational amplifier U1, a voltage division filter circuit and a reference voltage circuit; the voltage division filter circuit comprises a resistor R12, a resistor R13, a resistor R18 and a capacitor C4, the reference voltage circuit comprises a resistor R3, a resistor R4, a capacitor C3, a capacitor C9 and a voltage stabilizing diode U2, the cathode of a diode D7 is respectively connected with one ends of the resistor R10 and the resistor R12, the other end of the resistor R12 is respectively connected with one ends of the resistor R18 and the resistor R2 and the anode of the capacitor C4 through a resistor R13, the other end of the resistor R18 and the cathode of the capacitor C4 are grounded, and the other end of a resistor R2 is connected with the positive input end of an operational amplifier U1;
the other end of the resistor R10 is respectively connected with the cathode of the voltage stabilizing diode DZ1, the anode of the capacitor C5, one end of the capacitor C1 and the VCC end, and the anode of the voltage stabilizing diode DZ1, the cathode of the capacitor C5 and the other end of the capacitor C1 are grounded; the VCC end is respectively connected with the input end of a three-terminal voltage stabilizing diode U2 and one end of a resistor R4 through a resistor R3, the adjusting end of a three-terminal voltage stabilizing diode U2 is respectively connected with one end of a capacitor C9, the anode of a capacitor C3 and one end of a resistor R4, the output end of a three-terminal voltage stabilizing diode U2, the cathode of a capacitor C3 and the other end of a capacitor C9 are grounded, the other end of the resistor R4 is connected with the reverse input end of an operational amplifier U1, and a resistor R16 is connected between the output end and the forward input end of the operational amplifier U1.
Preferably, the switching device is a MOS transistor Q1, a gate of the MOS transistor Q1 is connected to one end of a capacitor C2, one end of a resistor R6 and one end of a resistor R1, respectively, the other end of the resistor R1 is connected to an output end of an operational amplifier U1, the other end of the resistor R6, the other end of the capacitor C2 and a source of the MOS transistor Q1 are grounded, and a drain of the MOS transistor Q1 is connected to a J3 end of the iron core coil.
Compared with the prior art, the invention has the beneficial effects that:
the invention uses simpler electronic components in the realization of the under-voltage protection function, and can realize the main under-voltage protection function only by using the simple combination of the capacitor, the diode, the switch tube and the iron core coil. The used device is simple, the reliability is higher, the power consumption is much lower than other common hardware schemes, and the heating problem of the power device and the coil is obviously improved.
Drawings
FIG. 1 is a schematic diagram of an under-voltage protection circuit according to the present invention;
fig. 2 is a schematic diagram of an under-voltage protection circuit according to the present invention.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
The principle of an under-voltage protection circuit of the present invention is shown in fig. 1, merely as an example to illustrate the principles of the present invention. 1. The power supply module converts commercial power into corresponding direct current to supply power to each module. 2. The energy storage filter circuit filters noise waves for the under-voltage action module and provides energy for attracting the iron core coil at the voltage recovery moment. 3. The voltage comparison module outputs a control signal to control the undervoltage action module to complete corresponding action by acquiring the power supply voltage and comparing the power supply voltage with the set reference voltage.
As shown in fig. 2, the undervoltage protection circuit of the present invention includes a capacitor C8, a storage filter circuit, a voltage comparator circuit, and a switch device for controlling the on/off of the iron core coil. The power supply inlet wire end is connected with one end of a high voltage-resistant capacitor C8 and the anode of a rectifier diode D7 respectively, the power supply input end is connected with a piezoresistor RV1 in parallel, the other end of the capacitor C8 is connected with the J1 end of an iron core coil through a bridge rectifier circuit formed by a diode D1, a diode D2, a diode D3 and a diode D4 to realize the resistance-capacitance voltage reduction function, the rear end is equivalent to an open circuit when the iron core is disconnected, at the moment, the C8 does not play a role in voltage reduction, and the voltage reduction function is only played after the iron core coil is attracted.
And a storage filter circuit is connected between the bridge rectifier circuit and the J1 end of the iron core coil. The energy storage filter circuit comprises an energy storage filter C6 and a capacitor C7 which are connected in parallel, one end of the capacitor C6 and one end of the capacitor C7 are connected with the output end of the bridge rectifier circuit, and the other end of the capacitor C6 and the other end of the capacitor C7 are grounded. When the iron core coil is disconnected, the two ends of the energy storage filter capacitor C6 and the capacitor C7 are high-voltage, and the stored energy is enough to enable the iron core to be instantly attracted when the voltage is recovered; when the iron core is attracted, the voltages at the two ends of the energy storage filter capacitor C6 and the capacitor C7 automatically drop to a very low level, so that the iron core coil cannot cause serious heating.
The cathode of the diode D7 is connected to one end of the resistor R10 and one end of the resistor R12, the other end of the resistor R10 is connected to the cathode of the zener diode DZ1, the anode of the capacitor C5, one end of the capacitor C1 and the VCC terminal, and the anode of the zener diode DZ1, the cathode of the capacitor C5 and the other end of the capacitor C1 are grounded. The VCC end is respectively connected with the input end of a three-terminal voltage stabilizing diode U2 and one end of a resistor R4 through a resistor R3, the adjusting end of a three-terminal voltage stabilizing diode U2 is respectively connected with one end of a capacitor C9, the anode of a capacitor C3 and one end of a resistor R4, the output end of a three-terminal voltage stabilizing diode U2, the cathode of a capacitor C3 and the other end of a capacitor C9 are grounded, the other end of the resistor R4 is connected with the reverse input end of an operational amplifier U1, and a resistor R16 is connected between the output end and the forward input end of the operational amplifier U1. The other end of the resistor R12 is connected with one end of the resistor R18 and the resistor R2 and the anode of the capacitor C4 through a resistor R13, the other end of the resistor R18 and the cathode of the capacitor C4 are grounded, and the other end of the resistor R2 is connected with the positive input end of the operational amplifier U1.
D7 is a rectifier diode, the rectified power supply is divided into two paths, one path of the rectified power supply is subjected to voltage division by an R10 resistor and then is subjected to action of a voltage stabilizing diode DZ1 to provide a stable VCC voltage, and the VCC voltage is processed by resistors R3 and R4, capacitors C3 and C9 and a voltage stabilizing diode U2 to provide a reference voltage for an operational amplifier U1; the other path is subjected to voltage division and filtering by resistors R12, R13, R18 and a capacitor C4 and then enters an operational amplifier U1 through a resistor R2 to provide a sampling voltage signal for U1.
The switching device adopts a MOS tube Q1, and the operational amplifier U1 outputs a corresponding control signal to the grid electrode of the MOS tube Q1 after the sampling voltage is compared with the reference voltage. The grid of the MOS tube Q1 is respectively connected with one end of a capacitor C2, one end of a resistor R6 and one end of a resistor R1, the other end of the resistor R1 is connected with the output end of an operational amplifier U1, the other end of the resistor R6, the other end of the capacitor C2 and the source of the MOS tube Q1 are grounded, the drain of the MOS tube Q1 is connected with the J3 end of the iron core coil, and the connection and the disconnection of the Q1 are controlled through an output signal of an operational amplifier U1, so that the attraction and the disconnection of the iron core coil are controlled.
When the power supply voltage is lower than a set protection value, the grid voltage signal of the MOS tube Q1 is lower than a trigger conduction value at the moment, and the MOS tube Q1 is in a turn-off state, so that the iron core coil cannot be attracted; when the power supply voltage is higher than the set protection value, the output signal of the operational amplifier U1 is higher than the grid triggering conduction value of the MOS tube Q1, the MOS tube Q1 is conducted, the iron core is instantly attracted, and the iron core and the front end capacitor C8 form a resistance-capacitance voltage reduction circuit, so that the current of the main loop is kept very small, the power consumption of the MOS tube is very small, and the heating condition of the coil and the MOS tube Q1 is effectively reduced.
The switching device (MOS transistor Q1) plays a role in executing logic control in the circuit; in the circuit, when the Q1 is conducted and the power supply voltage is recovered, the C6 and the C7 can ensure that enough energy is available to enable the iron core to be attracted rapidly, and after the iron core is attracted, the C8 can limit the current in the circuit to enable the voltage drop at two ends of the iron core coil to be reduced, so that the heating of the power device is improved obviously.
Claims (4)
1. An under-voltage protection circuit, comprising: the high-voltage-withstanding voltage-reducing transformer comprises a capacitor C8, an energy storage filter circuit, a voltage comparison circuit and a switch device for controlling the on-off of an iron core coil, wherein the power supply inlet wire end is respectively connected with one end of a high-voltage-withstanding capacitor C8 and the anode of a rectifier diode D7, the power supply input end is connected with a piezoresistor RV1 in parallel, the other end of the capacitor C8 is connected with the J1 end of the iron core coil through a bridge rectifier circuit to realize a resistance-capacitance voltage-reducing function, and the energy storage filter circuit is connected between the bridge rectifier circuit and the J;
the cathode of the diode D7 is connected with the driving pole of the switching device through the voltage comparison circuit, one end of the switching device is connected with the J3 end of the iron core coil, and the other end of the switching device is grounded; the voltage comparison circuit outputs signals to control the on and off of the switching device, so that the attraction and the disconnection of the iron core coil are controlled.
2. An undervoltage protection circuit as claimed in claim 1, wherein: the energy storage filter circuit comprises a capacitor C6 and a capacitor C7 which are connected in parallel, one end of the capacitor C6 and one end of the capacitor C7 are connected with the output end of the bridge rectifier circuit, and the other end of the capacitor C6 and the other end of the capacitor C7 are grounded.
3. An undervoltage protection circuit as claimed in claim 1, wherein: the voltage comparison circuit comprises an operational amplifier U1, a voltage division filter circuit and a reference voltage circuit; the voltage division filter circuit comprises a resistor R12, a resistor R13, a resistor R18 and a capacitor C4, the reference voltage circuit comprises a resistor R3, a resistor R4, a capacitor C3, a capacitor C9 and a voltage stabilizing diode U2, the cathode of a diode D7 is respectively connected with one ends of the resistor R10 and the resistor R12, the other end of the resistor R12 is respectively connected with one ends of the resistor R18 and the resistor R2 and the anode of the capacitor C4 through a resistor R13, the other end of the resistor R18 and the cathode of the capacitor C4 are grounded, and the other end of a resistor R2 is connected with the positive input end of an operational amplifier U1;
the other end of the resistor R10 is respectively connected with the cathode of the voltage stabilizing diode DZ1, the anode of the capacitor C5, one end of the capacitor C1 and the VCC end, and the anode of the voltage stabilizing diode DZ1, the cathode of the capacitor C5 and the other end of the capacitor C1 are grounded; the VCC end is respectively connected with the input end of a three-terminal voltage stabilizing diode U2 and one end of a resistor R4 through a resistor R3, the adjusting end of a three-terminal voltage stabilizing diode U2 is respectively connected with one end of a capacitor C9, the anode of a capacitor C3 and one end of a resistor R4, the output end of a three-terminal voltage stabilizing diode U2, the cathode of a capacitor C3 and the other end of a capacitor C9 are grounded, the other end of the resistor R4 is connected with the reverse input end of an operational amplifier U1, and a resistor R16 is connected between the output end and the forward input end of the operational amplifier U1.
4. An undervoltage protection circuit as claimed in claim 1, wherein: the switching device is a MOS tube Q1, the grid electrode of the MOS tube Q1 is respectively connected with one end of a capacitor C2, one end of a resistor R6 and one end of a resistor R1, the other end of the resistor R1 is connected with the output end of an operational amplifier U1, the other end of the resistor R6, the other end of the capacitor C2 and the source electrode of the MOS tube Q1 are grounded, and the drain electrode of the MOS tube Q1 is connected with the J3 end of the iron core coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011381646.0A CN112542819A (en) | 2020-12-01 | 2020-12-01 | Under-voltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011381646.0A CN112542819A (en) | 2020-12-01 | 2020-12-01 | Under-voltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112542819A true CN112542819A (en) | 2021-03-23 |
Family
ID=75016734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011381646.0A Pending CN112542819A (en) | 2020-12-01 | 2020-12-01 | Under-voltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112542819A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205265230U (en) * | 2015-06-15 | 2016-05-25 | 温州永奇电气科技有限公司 | Voltage controller is owed in outage time delay |
| CN206135389U (en) * | 2016-08-30 | 2017-04-26 | 德力西电气有限公司 | Under -voltage tripper |
| CN106786397A (en) * | 2016-12-05 | 2017-05-31 | 成都小晓学教育咨询有限公司 | Voltage protection circuit based on circuit rectifies bridge |
| CN208638015U (en) * | 2018-09-04 | 2019-03-22 | 厦门盈瑞丰电子科技有限公司 | A kind of device for under-voltage releasing equipment circuit |
| WO2019109811A1 (en) * | 2017-12-05 | 2019-06-13 | 广州金升阳科技有限公司 | Battery short-circuit protection circuit for charging power supply |
-
2020
- 2020-12-01 CN CN202011381646.0A patent/CN112542819A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205265230U (en) * | 2015-06-15 | 2016-05-25 | 温州永奇电气科技有限公司 | Voltage controller is owed in outage time delay |
| CN206135389U (en) * | 2016-08-30 | 2017-04-26 | 德力西电气有限公司 | Under -voltage tripper |
| CN106786397A (en) * | 2016-12-05 | 2017-05-31 | 成都小晓学教育咨询有限公司 | Voltage protection circuit based on circuit rectifies bridge |
| WO2019109811A1 (en) * | 2017-12-05 | 2019-06-13 | 广州金升阳科技有限公司 | Battery short-circuit protection circuit for charging power supply |
| CN208638015U (en) * | 2018-09-04 | 2019-03-22 | 厦门盈瑞丰电子科技有限公司 | A kind of device for under-voltage releasing equipment circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108539708A (en) | A kind of multiple overcurrent-overvoltage safety protection circuit | |
| CN205545180U (en) | Short -circuit protection circuit and power supply device | |
| CN102790375B (en) | Direct current undervoltage release and circuit breaker | |
| CN114124055B (en) | Single live wire micro-power consumption WIFI wall switch circuit | |
| CN206685893U (en) | A kind of power input protection circuit of the road vehicle controller based on discrete component | |
| CN207718188U (en) | A kind of ON-OFF control circuit | |
| CN107635343A (en) | Input detection protection circuit and HID lamp AC electronic ballast | |
| CN113725835B (en) | Surge current suppression circuit for spacecraft switch control path | |
| CN112542819A (en) | Under-voltage protection circuit | |
| CN101771338A (en) | Switching power supply module with high reliability and low power consumption | |
| CN202917957U (en) | Relay switching-off and switching-on control circuit for ammeter and intelligent ammeter | |
| CN214154002U (en) | Driver control circuit | |
| CN208589767U (en) | A kind of power supply or battery export self- recoverage short-circuit protection circuit | |
| CN209169052U (en) | A kind of self-shield D.C. contactor driving circuit | |
| CN207408524U (en) | Control box has access to electricity short-circuit detecting circuit on charging gun cable | |
| CN102946088A (en) | Switch-on/off control circuit for electric meter relay and intelligent electric meter | |
| CN202817699U (en) | DC undervoltage tripping device and breaker | |
| CN215183734U (en) | Quick release circuit of energy-saving module of contactor | |
| CN208241298U (en) | A kind of power supply or battery self- recoverage short-circuit protection circuit based on field-effect tube | |
| CN214851264U (en) | Protection circuit and power supply device | |
| CN220857615U (en) | Power supply device | |
| CN218215191U (en) | Permanent magnet current-limiting circuit based on constant current chopping | |
| CN109585221A (en) | A kind of switch arc suppression control method | |
| CN214898258U (en) | Relay zero-crossing control circuit | |
| CN212849841U (en) | Short-circuit protection circuit of switching power supply |
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 |