CN201134755Y - Variable-frequency power supply circuit protecting device - Google Patents
Variable-frequency power supply circuit protecting device Download PDFInfo
- Publication number
- CN201134755Y CN201134755Y CNU2007201707829U CN200720170782U CN201134755Y CN 201134755 Y CN201134755 Y CN 201134755Y CN U2007201707829 U CNU2007201707829 U CN U2007201707829U CN 200720170782 U CN200720170782 U CN 200720170782U CN 201134755 Y CN201134755 Y CN 201134755Y
- Authority
- CN
- China
- Prior art keywords
- power supply
- power
- relay
- mcu
- circuit
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model relates to a variable-frequency power source current supply circuit protective device which comprises an MCU, a power relay and a power resistance, wherein the power relay is connected on an input end of a current supply circuit in series, the MCU is supplied with working voltage to drive the power relay to cut off or close by the current supply circuit, and the power resistance is connected with the power relay in parallel. When power supply circuit is primarily electrified, the protective device cuts off a main circuit, the voltage is divided and the current is limited through the power resistance, thereby only very small electric current is provided, each component in the circuit is prevented from shocking, the relay is driven to be closed through the MCU after normal work, and the power resistance is bypassed. If the power supply circuit appears abnormally, the MCU drives the relay to cut off, thereby the safety of the circuit is guaranteed, the protective device circuit is simple and easily realized, and the cost is low.
Description
Technical field
The utility model relates to the variable frequency power supply power supply circuits, more particularly, relates to a kind of variable frequency power supply power supply circuits protective device.
Background technology
In the household electrical appliance control circuit, generally directly provide operating voltage to circuit by variable frequency power supply.The major defect of this design is, when powerful variable frequency power supply when powering on for circuit for the first time, can produce big electric current, the related device in the circuit is caused very big impact, thereby causes components from being damaged easily, thereby dangerous.So when circuit powered on for the first time, needing to provide very little electric current, can guarantee that chip and relay work get final product, make the electric current on the major loop recover normal by chip operation then.
The utility model content
The technical problem that this new device will solve is; above-mentioned shortcoming and defect at existing power supply circuits; a kind of safe variable frequency power supply power supply circuits protective device is provided; can when powering on for the first time, circuit only have little electric current to flow through; recover normal current when circuit working is no abnormal again, thereby reach the purpose of each device in the protective circuit.
In order to solve the problems of the technologies described above; the technical scheme that this new device is taked is: a kind of variable frequency power supply power supply circuits protective device is provided; comprise MCU, power relay and power resistor; described power relay is connected in series on the input of power supply circuits; described MCU provides the disconnection and closure of operating voltage to drive described power relay by power supply circuits, and described power resistor and described power relay are connected in parallel.
Wherein, described power relay is connected in series between filter circuit and the rectifier bridge.
Wherein, the relay of described MCU driving mouth is connected with the conducting that drives described triode and ends with the base stage of a triode, the grounded emitter of described triode, and the collector electrode of described triode inserts the input circuit of described power relay.
Wherein, described protective device also comprises the LED lamp that is connected with MCU, and is luminous by described MCU driving.
Wherein, described power resistor is a PTC resistance.
Enforcement the utlity model has following useful technique effect: this protective device is controlled the cut-out or the closure of main circuit by power relay.Main circuit cuts off when powering on for the first time, and variable frequency power supply only provides very little electric current by power resistor dividing potential drop current limliting, thereby has prevented that each device in the circuit from being impacted; MCU operate as normal rear drive relay closes, the main circuit closure, power resistor is by bypass.If power supply circuits occur unusual, MCU will drive relay and not work (disconnection), guarantee the safety of circuit, and simultaneously by LED lamp newspaper fault.In addition, this protective device circuit is simple and easy to realize that cost is low.
Description of drawings
Fig. 1 is the circuit diagram according to an embodiment of variable frequency power supply power supply circuits of the present utility model;
Fig. 2 is the control operation flow chart of MCU among Fig. 1.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
According to the variable frequency power supply power supply circuits of an embodiment of the utility model as shown in Figure 1, mainly comprise filter circuit 12, protective circuit 14, rectifier bridge 16, electrochemical capacitor C104, Switching Power Supply 18 and various other circuit 20.Wherein, the AC power of 220V is mainly carried out filtering through filter circuit 12, carries out rectification through rectifier bridge 16, provides the required operating voltage of each device work in the circuit through Switching Power Supply 18 again behind electrochemical capacitor C104.
Give that each device impacts in the circuit when preventing that variable frequency power supply from powering on for the first time, the utility model is set up protective circuit 14 in these power supply circuits, mainly be made of power relay JR103 and power resistor R1.Power relay JR103 is connected in series on the input of power supply circuits, and specifically as shown in fig. 1, power relay JR103 is connected between filter circuit 12 and the rectifier bridge 16.In the specific embodiment, the power relay G4A-1A that power relay JR103 can use Omron Corp to produce.Power resistor R1 and power relay JR103 are connected in parallel, and make when power relay JR103 disconnects, and variable frequency power supply is via power circuit R1 conducting current supply circuit, because the dividing potential drop current limliting of power resistor R1 provides less current to circuit.Power circuit R1 can adopt PTC resistance.
By the above protective circuit of setting up 14; predeterminable power relay JR103 state at the beginning is an off-state; thereby when the variable frequency power supply power supply circuits power on for the first time; power supply is via power resistor R1 dividing potential drop current limliting; have only very little electric current to offer each device in the circuit; prevented of the impact of big electric current, realized protective effect each device.Then, power controlling relay J R103 closure again, with power resistor R1 bypass, it is normal that power supply circuits recover.
The utility model comes the closure and the disconnection of power controlling relay by MCU.As shown in Figure 1, MCU 22 provides operating voltage by Switching Power Supply 18 and works.The relay of MCU 22 drives mouth and is connected with the base stage of triode TR1 after resistance R 2.The emitter machine ground connection of triode TR1, the input circuit of collector electrode access power relay J R103.
When these variable frequency power supply power supply circuits power on for the first time, power relay JR103 disconnects, variable frequency power supply is via filter circuit 15 filtering, through power resistor R1 dividing potential drop current limliting, through rectifier bridge 16 rectifications, behind electrochemical capacitor C104, provide the voltage of MCU 22 work and the voltage of power relay JR103 work through Switching Power Supply 18 again.After MCU 22 operate as normal, its relay is driven mouth put height, thereby make triode TR1 conducting, current supply circuit is connected in relay J R103 adhesive, thereby with power resistor R1 bypass.
If MCU 22 (for example detects circuit abnormality in the course of work, judge whether to meet designing requirement by parameters such as the electric current in the testing circuit, voltages), then MCU 22 puts its relay driving mouth low, thereby triode TR1 is ended, power relay JR103 disconnects, and variable frequency power supply is via power resistor R1 dividing potential drop current limliting.In addition, as shown in Figure 1, MCU 22 can be connected with LED light LED1 through resistance R 3.When MCU 22 detects circuit abnormality, driving LED 1 luminous newspaper fault.
Fig. 2 is the control operation flow chart of MCU among embodiment of the utility model, and is specific as follows:
In the step 202, MCU is started working by the Switching Power Supply power supply;
In the step 204, MCU drives mouth with its relay and puts height, makes the triode conducting and the driving power relay closes, with the power resistor bypass;
In the step 206, whether the various parameters in the MCU testing circuit are normal;
In the step 208, occur unusually if MCU detects circuit, then its relay is driven mouth and put lowly, thereby triode is ended power relay is disconnected, variable frequency power supply offers rectifier bridge after via power circuit dividing potential drop current limliting; Simultaneously, the luminous newspaper fault of MCU driving LED lamp;
If it is normal to detect in the circuit parameters in the step 208, then keep the power supply circuits operate as normal, enter end step 210.
Claims (5)
1, a kind of variable frequency power supply power supply circuits protective device; it is characterized in that; comprise MCU, power relay and power resistor; described power relay is connected in series on the input of power supply circuits; described MCU provides the disconnection and closure of operating voltage to drive described power relay by power supply circuits, and described power resistor and described power relay are connected in parallel.
2, variable frequency power supply power supply circuits protective device according to claim 1 is characterized in that described power relay is connected in series between filter circuit and the rectifier bridge.
3, variable frequency power supply power supply circuits protective device according to claim 1; it is characterized in that; the relay driving mouth of described MCU is connected with the conducting that drives described triode and ends with the base stage of a triode; the transmitter ground connection of described triode, the collector electrode of described triode inserts the input circuit of described power relay.
4, variable frequency power supply power supply circuits protective device according to claim 1 is characterized in that, described protective device also comprises the LED lamp that is connected with MCU, and is luminous by described MCU driving.
5, variable frequency power supply power supply circuits protective device according to claim 1 is characterized in that, described power resistor is a PTC resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201707829U CN201134755Y (en) | 2007-11-20 | 2007-11-20 | Variable-frequency power supply circuit protecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201707829U CN201134755Y (en) | 2007-11-20 | 2007-11-20 | Variable-frequency power supply circuit protecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201134755Y true CN201134755Y (en) | 2008-10-15 |
Family
ID=40063025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201707829U Expired - Fee Related CN201134755Y (en) | 2007-11-20 | 2007-11-20 | Variable-frequency power supply circuit protecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201134755Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185497A (en) * | 2011-04-27 | 2011-09-14 | 南京航空航天大学 | Automatic power-off device |
| CN102545666A (en) * | 2010-12-06 | 2012-07-04 | 三星电子株式会社 | Power supply apparatus and method to control the same |
| CN101534005B (en) * | 2009-04-09 | 2012-07-11 | 哈尔滨工业大学 | Suppressing circuit of power-on impact current |
| CN102629821A (en) * | 2012-05-04 | 2012-08-08 | 常州市运控电子有限公司 | Method for protecting charging current limiting resistor |
| US20150146459A1 (en) * | 2012-10-31 | 2015-05-28 | Zte Corporation | High-voltage protection circuit, high-voltage protection method and power supply |
| CN108964437A (en) * | 2018-06-07 | 2018-12-07 | 广州市普今电子科技有限公司 | A kind of circuit promoting starting capacitance load capability |
| CN109917162A (en) * | 2019-03-25 | 2019-06-21 | 昆山龙腾光电有限公司 | A kind of power protecting circuit and test device |
| CN110971113A (en) * | 2019-12-19 | 2020-04-07 | 广东美的暖通设备有限公司 | Drive control circuit, circuit board and air conditioner |
-
2007
- 2007-11-20 CN CNU2007201707829U patent/CN201134755Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101534005B (en) * | 2009-04-09 | 2012-07-11 | 哈尔滨工业大学 | Suppressing circuit of power-on impact current |
| CN102545666A (en) * | 2010-12-06 | 2012-07-04 | 三星电子株式会社 | Power supply apparatus and method to control the same |
| CN102185497A (en) * | 2011-04-27 | 2011-09-14 | 南京航空航天大学 | Automatic power-off device |
| CN102629821A (en) * | 2012-05-04 | 2012-08-08 | 常州市运控电子有限公司 | Method for protecting charging current limiting resistor |
| CN102629821B (en) * | 2012-05-04 | 2014-03-19 | 常州市运控电子有限公司 | Method for protecting charging current limiting resistor |
| US20150146459A1 (en) * | 2012-10-31 | 2015-05-28 | Zte Corporation | High-voltage protection circuit, high-voltage protection method and power supply |
| US9343951B2 (en) * | 2012-10-31 | 2016-05-17 | Zte Corporation | High-voltage protection circuit, high-voltage protection method and power supply |
| CN108964437A (en) * | 2018-06-07 | 2018-12-07 | 广州市普今电子科技有限公司 | A kind of circuit promoting starting capacitance load capability |
| CN109917162A (en) * | 2019-03-25 | 2019-06-21 | 昆山龙腾光电有限公司 | A kind of power protecting circuit and test device |
| CN109917162B (en) * | 2019-03-25 | 2021-08-06 | 昆山龙腾光电股份有限公司 | Power supply protection circuit and testing device |
| CN110971113A (en) * | 2019-12-19 | 2020-04-07 | 广东美的暖通设备有限公司 | Drive control circuit, circuit board and air conditioner |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201134755Y (en) | Variable-frequency power supply circuit protecting device | |
| CN101176386B (en) | Two-wire dimmer with power supply and load protection circuit in the event of switch failure | |
| CN202050564U (en) | Dimmable LED (Light-emitting Diode) drive circuit | |
| CN100478706C (en) | Electric exploration signal transmitter | |
| CN103346553A (en) | Reverse-connection-resisting and relay-coil-short-circuit-resisting control circuit of electronic controller | |
| CN202424157U (en) | LED output protection circuit | |
| CN107995732B (en) | Combined circuit and control circuit | |
| CN103692058B (en) | With the soft-start circuit of power factor correction circuit inverter type welder | |
| CN112636307A (en) | Driver precharge and power-up circuit | |
| CN105449642A (en) | Protection method and circuit of Boost circuit | |
| CN202004633U (en) | Protective device for power supply circuit of variable frequency power sources | |
| CN205212732U (en) | Separately excited DC machine a soft start control device based on STM32 | |
| CN209150781U (en) | A kind of uninterrupted fast charging and discharging DC power supply of industry solving Problem of Voltage Temporary-Drop | |
| CN101060245A (en) | Breaker coil protector | |
| CN214154002U (en) | Driver control circuit | |
| CN104210909A (en) | Load controller for elevator and frequency converter for elevator | |
| CN108899989A (en) | A kind of alternating current-direct current automatic switchover power supply system | |
| CN205005320U (en) | Driving circuit of light -emitting diode (LED) fluorescent tube | |
| CN105762755B (en) | A kind of the protection circuit and control method of single channel DC electromagnet | |
| CN205584544U (en) | Integrative lamp of solar energy LED and drive circuit | |
| CN205725135U (en) | Three-phase intelligent seamless auto switching device for dual-electric source | |
| CN203813714U (en) | Motor driving device and frequency-conversion household electrical appliance | |
| CN201967221U (en) | LED (light-emitting diode) road lamp and control device thereof | |
| CN204038795U (en) | A kind of elevator load controller and frequency transformer for elevator | |
| CN2653521Y (en) | Phase-loss detection circuit for power supply grid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081015 Termination date: 20161120 |