CN2893443Y

CN2893443Y - Fan speed regulating circuit for strong discharge water heater

Info

Publication number: CN2893443Y
Application number: CN 200620033654
Authority: CN
Inventors: 朱宁东
Original assignee: CHENGDU CHIFFO ELECTRONICS (GROUP) Co Ltd
Current assignee: CHENGDU CHIFFO ELECTRONICS (GROUP) Co Ltd
Priority date: 2006-03-30
Filing date: 2006-03-30
Publication date: 2007-04-25
Anticipated expiration: 2016-03-30

Abstract

The utility model discloses a fan speed regulation circuit of a forced discharge water heater. The output signal from a single chip (D1) of a control circuit controls a drive light-coupler (N1) of a drive CMOS chip (D2); a drive two-way controllable silicone (V1) of the light-coupler (N1) controls a 220V power resource current and outputs through a pin (XS3); the formed commutated current provides a comparator (N3B) with full-wave signals which are input to an orifice lead (INTO) of the single chip (D1) as power resource synchronic impulse signals through the comparator (N3B). The utility model uses the control of the single chip to test the zero-crossing point of the alternating current, controls the commutating electric angle of the two-way controllable silicon, and stepless regulate the voltage on the fan with reliable performance and high efficiency. Thus the stepless speed regulation problem of the one-way AC asynchronous electromotor with small power used by the water heater is solved.

Description

The fan speed regulation circuit of forced-ventilated water heater

Technical field

The utility model relates to gas heater, especially relates to a kind of fan speed regulation circuit of forced-ventilated water heater.

Background technology

The fume exhausting type of gas heater mainly contains nature exhaust and forced exhaust formula, and burnt gas force can be discharged outdoor forced exhaust tankless water heater be safe water heater, is the developing direction of water heater from now on.Forced exhaust formula water heater is that the exhaust blower (air blast) that utilizes water heater inside is forced the waste gas of water heater to discharge, the required air of the fuel gas buring of water heater is provided by blower fan, because water heater thermic load variation in use, the needed air that burns also should respond changes that (thermic load is big, required combustion gas is many, more air need be provided, otherwise, then need to provide air still less), in control, the air quantity that need provide according to the size adjustment blower fan of load is regulated the rotating speed that air quantity need change blower fan.The employed blower fan of forced exhaust water heater has two classes substantially, and a class is a DC Brushless Motor, and another kind of is that small power single is to AC asynchronous motor.

Now the used small power single of water heater roughly is divided into two classes to the speed governing of AC asynchronous motor water heater blower fan, and 1, adopt the blower fan of double speed (or more speed), use two rich groups, this blower fan is complicated, and efficient is low, can not realize stepless speed regulation; 2, the way of series capacitance, inductance in the blower fan circuit, change puts on the voltage on the blower fan, and this blower fan can not be realized stepless speed regulation, needs to use relay to switch, and easily circuit is produced interference.

Summary of the invention

The purpose of this utility model provides a kind of dependable performance, stable, the fan speed regulation circuit of the forced-ventilated water heater of high efficiency.

In order to achieve the above object, the utility model adopts following technical scheme: a kind of fan speed regulation circuit of forced-ventilated water heater, the single-chip microcomputer output signal control chip of control circuit drives optocoupler, and optocoupler drives bidirectional triode thyristor control 220V power turn-on and exports by plug; The rectification circuit of the 8V alternating current that the input pin of transformer input plug provides by being made of unilateral diode, power supply that mu balanced circuit provides 5V are to circuit, the input pin of transformer input plug provides the 24V alternating current to provide 24V voltage to driving air valve by the rectification circuit that is made of unilateral diode, the unidirectional civil power 24V all-wave signal that the input pin of transformer input plug provides 220V, 50Hz by the rectification circuit that is made of unilateral diode is to comparator, and this rectification all-wave signal is through being input to the mouth line of single-chip microcomputer as the power supply synchronization pulse behind comparator.

Described single-chip microcomputer adopts P87LPC762.Described driving chip adopts ULN2003, and optocoupler adopts S11MD5T, and bidirectional triode thyristor adopts BT136, and comparator adopts LM339.

The utility model is the control that utilizes single-chip microcomputer, detects the zero crossing of alternating current, the electrical angle of control two-phase silicon controlled conducting, and step-less adjustment puts on the voltage on the blower fan, dependable performance, efficient height.Thereby solve the stepless speed regulation problem of the used small power single of water heater to AC asynchronous motor.

Description of drawings

Fig. 1 is a circuit diagram of the present utility model.

The specific embodiment

A kind of circuit of fan speed regulation circuit of forced-ventilated water heater is seen shown in Figure 1: the single-chip microcomputer D1 output signal control chip D2 of control circuit drives optocoupler N1, and optocoupler N1 drives bidirectional triode thyristor V1 control 220V power turn-on and passes through plug XS3 output; Input pin (1 pin of transformer input plug XS5,2 pin) the 8V alternating current that provides passes through by unilateral diode V11, V12, V13, the rectification circuit that V14 constitutes, mu balanced circuit N2 provides the power supply of 5V to circuit, the input pin of transformer input plug XS5 (5 pin) provides the 24V alternating current to pass through by unilateral diode V7, V8, V9, the rectification circuit that V10 constitutes provides 24V voltage to driving air valve, input pin (3 pin of transformer input plug XS5,4 pin) pass through by unilateral diode V4, the rectification circuit that V5 constitutes provides 220V, the unidirectional civil power 24V all-wave signal of 50Hz is given comparator N3B, is input to the mouth line INTO of single-chip microcomputer D1 behind this rectified waveform process comparator N3B as the power supply synchronization pulse.Described single-chip microcomputer D1 adopts P87LPC762.Described chip D2 adopts ULN2003, and optocoupler N1 adopts S11MD5T, and bidirectional triode thyristor V1 adopts BT136, and comparator N3B adopts LM339.

In Fig. 1, the core of control circuit has adopted PHILIPS single-chip microcomputer D1, and output drives optocoupler N1 by driving chip D2, drives bidirectional triode thyristor V1 by optocoupler, and the conducting of control 220V power supply by plug XS3 output, drives blower fan.XS5 is the input plug of transformer, and 1,2 pin provide 8V to exchange, and by V11～V14 rectification, N2 (7805) voltage stabilizing provides the power supply (VCC) of circuit 5V.3,4 pin of transformer input plug XS5 provide 24V to exchange, by V7～V10 rectification, the 24V voltage that drives air valve is provided, do full-wave rectification by V4, V5 simultaneously, the 24V all-wave signal of the unidirectional civil power of 220V/50Hz is provided, and rectification wave mode (cycle of 10mS) is as INTO (PO3) mouthful of line of power supply synchronization pulse input single-chip microcomputer; During circuit working, the signal of V4, V5 rectification is by the effect of comparator LM339, at the zero crossing generation trailing edge wave mode of each AC signal, INTO (PO3) mouthful of line of signal input single-chip microcomputer; Single-chip microcomputer D1 detects trailing edge, produces to interrupt, in routine processes, close output, trigger is postponed and is opened the silicon controlled time (electrical angle that postpones the controllable silicon conducting) simultaneously, regulate by copped wave, reach the purpose of step-less adjustment output voltage each ac cycle.

Claims

1, a kind of fan speed regulation circuit of forced-ventilated water heater, it is characterized in that: the control of the single-chip microcomputer of control circuit (D1) output signal drives chip (D2) driving optocoupler (N1), and optocoupler (N1) drives bidirectional triode thyristor (V1) control 220V power turn-on and exports by plug (XS3); Input pin (1 pin of transformer input plug (XS5), 2 pin) alternating current that provides passes through by unilateral diode (V11, V12, V13, V14) rectification circuit of Gou Chenging, provide power supply to circuit behind the mu balanced circuit (N2), the alternating current that the input pin of transformer input plug (XS5) (5 pin) provides passes through by unilateral diode (V7, V8, V9, V10) provide voltage to driving air valve behind the rectification circuit of Gou Chenging, input pin (3 pin of transformer input plug (XS5), 4 pin) pass through by unilateral diode (V4, V5) rectification circuit of Gou Chenging provides the all-wave signal to comparator (N3B), and this rectification all-wave signal is input to the mouth line (INTO) of single-chip microcomputer (D1) as the power supply synchronization pulse through comparator (N3B) back.

2, the fan speed regulation circuit of forced-ventilated water heater according to claim 1 is characterized in that: single-chip microcomputer (D1) adopts P87LPC762.

3, the fan speed regulation circuit of forced-ventilated water heater according to claim 1 is characterized in that: drive chip (D2) and adopt ULN2003, optocoupler (N1) adopts S11MD5T, and bidirectional triode thyristor (V1) adopts BT136, and comparator (N3B) adopts LM339.