CN2491866Y

CN2491866Y - Purifying a.c. regulatted supply

Info

Publication number: CN2491866Y
Application number: CN 01235345
Authority: CN
Inventors: 刘琴
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-06-20
Filing date: 2001-06-20
Publication date: 2002-05-15
Anticipated expiration: 2011-06-20

Abstract

A cleaning alternating current stable voltage source comprises a sine energy distributor, a control circuit, a voltage stabilizing circuit, a relay JK1, and an over-voltage protection circuit, wherein the control circuit is composed of a microprocessing circuit, an over-zero input synchronous formation extract circuit, an over-zero output synchronous formation extract circuit, an output sample circuit, an excitation control circuit, a display circuit, and an alarm circuit. The cleaning alternating current stable voltage source which utilizes microprocessing as the core of the control circuit has the advantages that the control function is strong, the output voltage is exactly displayed, and the upgrade is simple.

Description

Purify alternating current steady voltage plug

The utility model relates to a kind of alternating current steady voltage plug, is meant a kind of purification alternating current steady voltage plug based on the work of sinusoidal energy distribution principle especially.

Purifying alternating current steady voltage plug is a kind of stabilized voltage supply commonly used, is widely used in the various electronic equipments.At present, home market existing ac purification power supply product all is based on the work of sinusoidal energy distribution voltage-regulation principle, and its control is to adopt traditional analog control mode, and this control mode has plurality of advantages such as control characteristic is better, efficient is high, cost is low.Yet adopt the purification alternating current steady voltage plug of analog control mode to exist many weak points,, function single as control function is unfavorable for expansion.

The purpose of this utility model is to overcome the deficiency of prior art, and strong, the easy upgrading of a kind of control function, the intelligent AC power that purifies are provided.

For achieving the above object; the utility model is to adopt following proposal to realize: it comprises sinusoidal energy dispenser, control circuit, mu balanced circuit, relay J K1, overvoltage crowbar, and control circuit is formed synchronously by micro-processor interface circuit, input zero passage and extracts circuit, output zero passage and form synchronously and extract circuit, output sample circuit, trigger control circuit, display circuit, warning circuit and form.The input of described micro-processor interface circuit is connected to the output sample circuit, the output zero passage forms the extraction circuit synchronously, imports the input that zero passage forms the extraction circuit synchronously, and its output connects display circuit, warning circuit, trigger control circuit.

The utility model will be further described below in conjunction with accompanying drawing.

Fig. 1 is an electric theory diagram of the present utility model.

Fig. 2 is the structured flowchart of control circuit

Fig. 3 is the utility model sinusoidal energy dispenser electrical schematic diagram.

Fig. 4 is the utility model control circuit schematic diagram.

Referring to Fig. 1; for the utility model comprises sinusoidal energy dispenser 1, mu balanced circuit 2, relay J K1, overvoltage crowbar 3, control circuit 4; the 220V alternating current powers to the load behind sinusoidal energy dispenser 1; the control of the size-controlled system circuit 4 of sinusoidal energy dispenser 1 output voltage; mu balanced circuit 2 provides working power for control circuit 4; overvoltage crowbar 3 disconnects relay J K1 when output voltage is too high, the protection load.

Referring to Fig. 2, control circuit 4 is formed synchronously by micro-processor interface circuit 9, input zero passage and extracts circuit 5, output zero passage and form synchronously and extract circuit 6, output sample circuit 7, trigger control circuit 8, display circuit 10, warning circuit 11 and form.The input of described micro-processor interface circuit 9 is connected to the input zero passage and forms extraction circuit 5 synchronously, exports the input that zero passage forms extraction circuit 6, output sample circuit 7 synchronously, and its output contacts control circuit 8, display circuit 10, warning circuit 11.

Referring to Fig. 3, sinusoidal energy dispenser is made up of inductance L 1, L2, L3, capacitor C 1, C2, bidirectional triode thyristor D1.The 220V alternating current is through L1, L2, L3, capacitor C 1, C2, behind the sinusoidal energy dispenser that bidirectional triode thyristor D1 forms, end output from inductance L 1, behind relay J K1, power to the load, the size of its output voltage is subjected to the control of bidirectional triode thyristor conducting state, inductance L 1 is drawn the input synchronizing voltage of a terminal as control circuit with the L2 tie-point, the control end SCR1 of bidirectional triode thyristor D2 links to each other with the trigger end of control circuit, the output terminal of sinusoidal energy dispenser is connected to a step-down transformer B1, the secondary of B1 has 3 groups: T2, T3, T4, the output of T2 is as the power supply of mu balanced circuit, the output of T3 is as the output sampling voltage, and the output of T4 is as the output synchronizing voltage.

Referring to Fig. 4, U1 is the MCU microprocessor, is the core component of The whole control, and it adopts the PIC16C711-04 processor of U.S. MICROCHIP company, and capacitor C 1, C2, crystal BS1, resistance R 1 are formed the crystal oscillating circuit of U1; The input zero passage forms the extraction circuit synchronously and is made up of amplifier U2A, diode D13, D14, D15, D16, resistance R 20, R21, R22, R23, R24, R16, R17, input zero passage synchronizing pulse forms and extracts circuit and provide the zero-crossing pulse signal of a width＜1ms every 10ms to the 6th pin of MCU, the time-base signal that triggers as the bidirectional triode thyristor phase shift; The output zero passage forms the extraction circuit synchronously to be made up of amplifier U2C, diode D11, D12, resistance R 13, R14, R15, R18, and it provides a rectangular pulse signal every 10ms to the 13rd pin of MCU, as the sampling time-base signal of MCU; Overvoltage crowbar is made up of amplifier U2B, resistance R 8, R18, R27, R28, potentiometer VR2, capacitor C 4, triode Q4, diode D2, relay J K1.The output sample circuit is made up of diode D1, D2, D3, D5, resistance R 10, R11, R12, potentiometer VR1, capacitor C 3, and the output sampled value is taken out 17 pin of delivering to microprocessor U1 through resistance R 10 from potentiometer VR1.Trigger control circuit is made up of triode Q1, Q2, resistance R 3, R246, R25, R26,1 pin of microprocessor U1,2 pin connect the base stage of triode Q2, Q1 respectively behind resistance R 2, R3, the collector of triode Q2, Q1 connects the control end of bidirectional triode thyristor D2 respectively through resistance R 25, R26.Display circuit is made up of digital circuit U5, light-emitting diode display, triode Q7, Q8, Q9, resistance R 29～R35, R4, R6,7 pin of U1,8 pin, 9 pin link to each other with the base stage of Q7, Q8, Q9 through resistance R 4, R5, R6 respectively, 10 pin of U1,11 pin connect 2 pin, 3 pin of U5 respectively, and display circuit is finished the accurate demonstration of output voltage; Warning circuit is made up of hummer FMQ, triode Q3, resistance R 19, and the alerting signal of little processing 12 pin output is delivered to the base stage of Q3 through resistance R 9, amplifies the back through Q3 and promotes hummer FMQ warning.

Principle of work of the present utility model is summarized as follows: civil power is through inductance L 1, L2, L3; after capacitor C 1, C2 and bidirectional triode thyristor D1 form sinusoidal energy dispenser; powering load behind overvoltage protective relay JK1 again; the size-controlled system circuit control of its output voltage, control circuit is kept the stable of output voltage by the conduction angle of control bidirectional triode thyristor.Its concrete control procedure is as follows: when output voltage changes, sample circuit is the fluctuating signal of 50Hz with the interchange output transform of 50Hz, and amplitude dropped to the 17th pin that proper range offers MCU, MCU carries out synchronized sampling to the Hai signal down synchronously output zero passage synchronizing signal, and finish A/D and change, when 10ms finishes, MCU carries out data processing to adopting data, and with this result and the comparison of standard output valve, according to the result relatively and the comprehensive condition of variation, calculate the silicon controlled conduction angle, import the down synchronous of zero passage synchronizing signal again, MCU is in the semiperiod of each civil power, according to the triggering and conducting angle of calculating, send and trigger control signal,, reach the purpose of adjusting and regulated output voltage by the ON time of bidirectional triode thyristor in the trigger control circuit control sinusoidal energy dispenser to trigger control circuit.When output voltage change to surpass setting, the threshold value of MCU and setting relatively after, send interrupted alerting signal by its 12 pin to warning circuit, the while sends abnormal signal by its 7～11 pin to display circuit, is shown by display circuit.Digital display circuit is in the semiperiod of each civil power, and the output voltage that sampling is obtained shows output voltage values with dynamic scan mode through 7～11 pin of MCU on LED.The 220V alternating current is delivered to mu balanced circuit by winding T2 after transformer B1 step-down, provide working power through rectification, voltage stabilizing to control circuit.

The overvoltage crowbar principle of work is; exchange output behind transformer B1 isolated buck; form the bridge rectifier rectification by D7～D9; to deliver to by U2B after R19, VR2, R28 voltage divider dividing potential drop be the main comparer positive input of forming to DC voltage after the rectification; when if its value is lower than comparer reverse input end setting value 6V, the comparer output low level, triode Q4 ends; overvoltage protection relay J K1 is failure to actuate, and stable voltage is exported to load through the normally closed contact of protective relay.Otherwise improper voltage output is cut off in overvoltage protection relay J K1 action, reaches the purpose of protection payload security.

The utility model is owing to adopt microprocessor as the core control circuit of power supply, its tool Strong, the accurate advantage that shows output voltage, easy upgrading of control function is arranged.

Claims

A kind of purification alternating current steady voltage plug, it comprises sinusoidal energy dispenser (1), mu balanced circuit (2), relay J K ₁Overvoltage crowbar (3); control circuit (4); it is characterized in that: control circuit (4) is by micro-processor interface circuit (9); the input zero passage forms synchronously extracts circuit (5); the output zero passage forms synchronously extracts circuit (6); output sample circuit (7); trigger control circuit (8); display circuit (10); warning circuit (11) is formed; the input of described micro-processor interface circuit (9) is connected to the input zero passage and forms extraction circuit (5) synchronously; the output zero passage forms synchronously extracts circuit (6); the input of output sample circuit (7), control circuit (8) is sent out in its output contact; display circuit (10); warning circuit (11).