CN202004633U - Protective device for power supply circuit of variable frequency power sources - Google Patents
Protective device for power supply circuit of variable frequency power sources Download PDFInfo
- Publication number
- CN202004633U CN202004633U CN2011200581660U CN201120058166U CN202004633U CN 202004633 U CN202004633 U CN 202004633U CN 2011200581660 U CN2011200581660 U CN 2011200581660U CN 201120058166 U CN201120058166 U CN 201120058166U CN 202004633 U CN202004633 U CN 202004633U
- Authority
- CN
- China
- Prior art keywords
- power supply
- power
- relay
- circuit
- variable frequency
- 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
- Rectifiers (AREA)
Abstract
The utility model relates to a protective device for a power supply circuit of variable frequency power sources, which comprises a micro control unit (MCU), a power relay and a power resistor. The power relay is in series connection with an input end of the power supply circuit, the MCU is supplied by the power supply circuit to drive the opening and closing of the power relay, and the power resistor is in parallel connection with the power relay. The protective device for the power supply circuit of variable frequency power sources enables small current to flow on the circuit when the circuit is initially connected, and returns to normal current when the working of the circuit has no abnormities, thereby achieving the aim of protecting devices in the circuit.
Description
Technical field
The utility model relates to the variable frequency power supply power supply circuits, relates in particular 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 utility model is at the above-mentioned defective of prior art; a kind of variable frequency power supply power supply circuits protective device is provided; can when circuit powers on for the first time, only there be little electric current to flow through, recovers 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 utility model is achieved through the following technical solutions:
A kind of variable frequency power supply power supply circuits protective device; 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.
Preferably, described power relay is connected in series between filter circuit and the rectifier bridge.
Preferably, 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.
Preferably, described protective device also comprises the LED lamp that is connected with MCU, and is luminous by described MCU driving.
Preferably, described power resistor is a PTC resistance.
As can be seen from the above technical solutions, the utility model 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, and 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 of the 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
Below in conjunction with embodiment the utility model is described in further detail.
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 JRl03 and power resistor R1.Power relay JRl03 is connected in series on the input of power supply circuits, and specifically as shown in fig. 1, power relay JRl03 is connected between filter circuit 12 and the rectifier bridge 16.In the specific embodiment, the power relay G4A-1A that power relay JRl03 can use Omron Corp to produce.Power resistor R1 and power relay JRl03 are connected in parallel, and make when power relay JRl03 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 JRl03 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 Rl03 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 TRl after resistance R 2.The grounded emitter of triode TRl, the input circuit of collector electrode access power relay J Rl03.
When these variable frequency power supply power supply circuits power on for the first time, power relay JRl03 disconnects, variable frequency power supply is via filter circuit 12 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 JRl03 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 Rl03 adhesive, thereby with power resistor R1 bypass.
If in the course of work: MCU 22 detects circuit abnormality (for example, judging 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 makes triode.TRl ends, and power relay JRl03 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 LEDl through resistance R 3.When MCU 22 detects circuit abnormality, the luminous newspaper fault of driving LED l.
Fig. 2 is among embodiment of the utility model: the control operation flow chart of MCU, specific as follows:
In the step 202, MCU is started working by the Switching Power Supply power supply;
In the step 204, MCU drives its relay and mouthful puts height, makes the triode conducting and driving power continues
The electrical equipment closure is 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.
Above-mentioned specific embodiment is purpose, feature and the effect that is used for describing in detail the utility model, for the personage who is familiar with this type of skill, according to the above description, may do part change and modification to this specific embodiment, its essence does not detach the spiritual category person of the utility model, all should be included in the claim of this case suitable first Chen Ming.
Claims (5)
1. 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. according to the described variable frequency power supply power supply circuits of claim l protective device; 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 grounded emitter 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 |
|---|---|---|---|
| CN2011200581660U CN202004633U (en) | 2011-03-08 | 2011-03-08 | Protective device for power supply circuit of variable frequency power sources |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200581660U CN202004633U (en) | 2011-03-08 | 2011-03-08 | Protective device for power supply circuit of variable frequency power sources |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202004633U true CN202004633U (en) | 2011-10-05 |
Family
ID=44707359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200581660U Expired - Fee Related CN202004633U (en) | 2011-03-08 | 2011-03-08 | Protective device for power supply circuit of variable frequency power sources |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202004633U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150146459A1 (en) * | 2012-10-31 | 2015-05-28 | Zte Corporation | High-voltage protection circuit, high-voltage protection method and power supply |
-
2011
- 2011-03-08 CN CN2011200581660U patent/CN202004633U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201134755Y (en) | Variable-frequency power supply circuit protecting device | |
| CN101882879A (en) | Circuit converting constant current source to constant voltage source and light using same | |
| CN203352856U (en) | Capacitor step-down LED lighting power supply with open circuit protection | |
| CN102869173A (en) | Light-emitting diode (LED) drive power supply device | |
| CN109152184A (en) | lamp control device and lighting system | |
| CN202841639U (en) | Light-emitting diode (LED) driving power device | |
| CN103375887B (en) | The control circuit of air-conditioner, control method and air-conditioner | |
| CN103346553A (en) | Reverse-connection-resisting and relay-coil-short-circuit-resisting control circuit of electronic controller | |
| CN103631154B (en) | A kind of dish-washing machine, power-supplying circuit and circuit breaking controlling method | |
| CN202004633U (en) | Protective device for power supply circuit of variable frequency power sources | |
| CN202561966U (en) | Air conditioner control circuit and air conditioner | |
| CN205490112U (en) | Automatic discharge device | |
| CN103692058A (en) | Soft start circuit with power correction circuit inverter-type welding machine | |
| CN109412466A (en) | The compound start stop apparatus of turbine emergency DC lubricating and control method | |
| CN201518467U (en) | Single-phase motor soft starter and air conditioner with same | |
| CN214154002U (en) | Driver control circuit | |
| CN202979415U (en) | Switch | |
| CN104210909A (en) | Load controller for elevator and frequency converter for elevator | |
| CN201967221U (en) | LED (light-emitting diode) road lamp and control device thereof | |
| CN203104914U (en) | Improved LED (Lighting-Emitting Diode) driving circuit | |
| CN202663604U (en) | Led lamp driving circuit | |
| CN201332464Y (en) | Switch power supply circuit and television | |
| CN207150898U (en) | Prevent electric backflash circuit under LED light device | |
| CN204038795U (en) | A kind of elevator load controller and frequency transformer for elevator | |
| CN104991484B (en) | Standby zero-power-consumption countdown timer |
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 |
Granted publication date: 20111005 Termination date: 20150308 |
|
| EXPY | Termination of patent right or utility model |