CN202103616U - Electronic temperature controller having compressor starting function - Google Patents

Abstract

Provided is an electronic temperature controller having a compressor starting function. The electronic temperature controller is composed of a power supply circuit (1), a one-chip microcomputer (7), a compressor switch circuit (3), a compressor starting circuit (2), a temperature compensating circuit (4), a temperature adjusting and detecting circuit (5), and an LED lamp set (6). The electronic temperature controller employs the one-chip microcomputer to form a control system, with the power supply circuit thereof adopting capacitor to reduce voltage and the positive and negative halfwaves being respectively processed, wherein the positive half cycle, after rectification filtering voltage stabilization, provides power to the control system formed by the one-chip microcomputer (7); and the negative half cycle, after rectification filtering voltage stabilization, provides power supply to the LED lamp set (6) for internal illumination of the refrigeration device. Two connecting leads are arranged between a compressor starting circuit (2) and the compressor (Cp), wherein one connecting lead is connected with the compressor starting winding (S) while the other connecting lead is connected with the common terminal (C) of the starting winding (S) and the main winding (M). The electronic temperature controller, with extremely simple circuit, realizes the function of the conventional compressor non-power consumption starter upon the electronic temperature controller, featuring concise circuit, low cost, and wide application range.

Description

A kind of electronic temperature control device with the compressor start function

Technical field

The present invention relates to a kind of temperature control equipment, particularly the electronic temperature control device of small-sized refrigerating utensil.

Background technology

At present, adopt electronic technology to realize that temperature controlled scheme has a lot.The temperature controlling schemes overwhelming majority to the small-sized refrigerating utensil is to adopt traditional compression-type temperature controller, and its function singleness just realize temperature control, but it is with low cost, so obtained to be widely used.In recent years, along with growth in the living standard, people no longer satisfy simple temperature control requirement; On some refrigerating appliances, bring into use single-chip computer control system; It has also added many other functions except can realizing the temperature controlled function, such as temperature shows, touch key-press or the like; But, be a kind of simple start-stop to the control and the indifference of the control of the compressor of refrigerating appliance and traditional compression-type temperature controller.

The small-sized refrigerating utensil uses the single phase alternating current (A.C.) compressor to realize refrigerating function usually, and the employed load motor of compressor generally has two windings, and one is main winding, and another is starting winding (also claiming auxiliary winding).The starting winding works when electric motor starting, and behind electric motor starting, needs to realize breaking off, and main winding is used to realize steady operation.Just because of the existence of starting winding is arranged, compressor has all attached starter usually, and the starter that uses at present has three types: Weight type starter, PTC starter, electronic type power consumption starter.The Weight type starter is because the defective of self seldom use at present; The PTC starter is because inexpensive present use is very extensive, but has the power consumption about 1～5 watt during its work, therefore at some energy consumption is had the refrigerating appliance of special demands and uses the electronic type power consumption starter, but this starter costs an arm and a leg, so use seldom.

Summary of the invention

The purpose of this invention is to provide a kind of electronic temperature control device, to solve the defective that existing electronic temperature control device does not have the compressor start function with the compressor start function.Owing to be the compressor start function that on the basis of electronic temperature control device, realizes, so it is with low cost, and has realized no power consumption starting, meet current environmental requirement, have market application foreground widely.

The present invention is achieved in that the electronic temperature control device (hereinafter to be referred as " thermostat ") of described band compressor start function, is made up of power circuit 1, single-chip microcomputer 7, compressor switch circuit 3, compressor start circuit 2, temperature-compensation circuit 4, adjustment and testing circuit 5 and LED lamp group 6.This thermostat is formed a control system by single-chip microcomputer 7, and its power circuit 1 adopts capacitance decompression, and positive and negative then half-wave is handled respectively, and positive half cycle is wherein supplied power to single-chip computer control system after the rectifying and wave-filtering voltage stabilizing; The LED lamp group 6 that negative half period uses for the refrigerating appliance interior lighting after the rectifying and wave-filtering voltage stabilizing provides power supply; Done two benefits like this: the one, with low cost; Two is that two groups of power supplys are independent of each other; Be convenient to independent control, the power supply of the LED lamp group of using especially for the refrigerating appliance interior lighting 6 needs frequent switch; Can certainly after the rectifying and wave-filtering voltage stabilizing, supply power by negative half period, and the LED lamp group 6 that positive half cycle uses for the refrigerating appliance interior lighting after the rectifying and wave-filtering voltage stabilizing provides power supply to single-chip computer control system.Thermostat detects the refrigerating appliance temperature inside through adjustment and testing circuit 5;, pass through by needs compressor switch circuit 3 Driven Compressor Cp when freezing; Meanwhile pass through the starting winding of compressor start circuit 2 Driven Compressor Cp; Through after compressor Cp starting, turn-offing compressor start circuit 2 after a while, so just realized compressor Cp start-up function.Compressor start circuit 2 is controlled through single-chip microcomputer 7, and the executive component of this starting circuit both can be that the bidirectional triode thyristor element also can be a relay.Have two to be connected lead between compressor start circuit 2 and the compressor Cp, one is connected with the starting winding S of compressor Cp, and another is connected with the starting winding S of compressor Cp and the common port C of main winding M.Original thermostat has a lead that is connected with the starting winding S of compressor Cp just can realize the start-up function of compressor Cp; But the overload protective device P action protection that causes compressor Cp when unexpected reason; And overload protective device P cooling recover to connect after because the single-chip computer control system of thermostat and do not know that overload of compressor protector P protection action then connected compressor Cp; Cause thermostat can not provide initiating signal once more, thereby compressor Cp can't start once more.The problem that the compressor Cp that causes in order to solve overload of compressor protector P action can't start once more; We introduce a signal line at the starting winding S of compressor Cp and the common port C of main winding M (normally overload protective device P link to each other with compressor Cp an end) and give thermostat; Thermostat just can know when the overload protective device P of compressor Cp has moved like this; In case overload of compressor protector P action and when recovering thermostat control compressor start circuit 2 immediately and reset once, so just can guarantee compressor Cp normal starting.

Accompanying drawing and description of drawings

Fig. 1 is a functional-block diagram of the present invention

Fig. 2 is a kind of embodiment schematic diagram of the present invention

Embodiment

Fig. 2 is a kind of embodiment schematic diagram of the present invention.

In Fig. 2, L, N are the single phase alternating current power supply incoming lines, and Cp is a compressor, and three incoming line S of compressor Cp, M, C are respectively starting winding, main winding and common ports, and P is the overload protective device of compressor, and H1 is the heater that refrigerating appliance is used for temperature-compensating.C1 is the capacitor that is used for step-down; U1 is a single-chip microcomputer; D3, R3, C3, D4, C4 constitute the single-chip computer control system power supply that the halfwave rectifier stabilized voltage power supply is given the electronic temperature control device of above-mentioned band compressor start function with the positive half cycle of AC power; The LED lamp group that D1, D2, R2, C2 use for the refrigerating appliance interior lighting with the negative half period formation half-wave stabilized voltage power supply of AC power provides power supply; R6, Q2, R5, Q1, D5, K1 form the compressor switch circuit; D7, R8, D6, R9, Q4 form the compressor start circuit; Wherein Q4 is the bidirectional triode thyristor of Driven Compressor starting winding; Also can replace with relay, D7, R8, D6 form the signal deteching circuit of overload of compressor protector action, and this signal is sent into single-chip computer control system; W1, RW, R10, R11, C5 form adjustment and testing circuit.

The operation principle of above-mentioned thermostat is such: the control system of forming when single-chip microcomputer 7 (hereinafter to be referred as single-chip computer control system) detects through adjustment and testing circuit 5 and exports control signal when the refrigerating appliance temperature inside is higher than the temperature that the user sets and remove Driven Compressor Cp main winding M to compressor switch circuit 3; Meanwhile exporting control signal removes the starting winding S of Driven Compressor Cp for compressor start circuit 2; The main winding M of compressor Cp and starting winding S are simultaneously like this; Compressor Cp is able to running, and compressor Cp running back single-chip computer control system is exported control signal close compressor starting circuit 2 immediately.After compressor Cp breaks off because of unexpected reason overload protective device P action; In case overload protective device P is closed again; The signal deteching circuit of the overload of compressor protector action that D7, R8, D6 form is just sent signal into single-chip computer control system immediately; System exports the starting winding S that control signal removes Driven Compressor Cp for compressor start circuit 2 immediately, and compressor Cp main winding M and starting winding S obtain the electricity starting simultaneously.

Claims (4)

1. electronic temperature control device with the compressor start function; Form by power circuit [1], single-chip microcomputer [7], compressor switch circuit [3], compressor start circuit [2], temperature-compensation circuit [4], adjustment and testing circuit [5] and LED lamp group [6]; It is characterized in that: described compressor start circuit [2] has two leads to be connected with compressor [Cp]: a lead is connected with the starting winding [S] of compressor [Cp], and another is connected with the starting winding [S] of compressor [Cp] and the common port [C] of main winding [M]; Described power circuit [1] is that its positive half cycle provides power supply after the rectifying and wave-filtering voltage stabilizing, for the control system of above-mentioned single-chip microcomputer [7] composition after adopting capacitor step-down and step-down, and the LED lamp group [6] that negative half period uses for the refrigerating appliance interior lighting after the rectifying and wave-filtering voltage stabilizing provides power supply.

2. electronic temperature control device according to claim 1 is characterized in that the driving execution element that described compressor start circuit [2] is adopted realized by bidirectional triode thyristor.

3. electronic temperature control device according to claim 1 is characterized in that the driving execution element that described compressor start circuit [2] is adopted realized by relay.

4. electronic temperature control device according to claim 1; It is characterized in that described power circuit [1] is that its negative half period provides power supply after the rectifying and wave-filtering voltage stabilizing, for the control system of above-mentioned single-chip microcomputer [7] composition after adopting capacitor step-down and step-down, the LED lamp group [6] that positive half cycle uses for the refrigerating appliance interior lighting after the rectifying and wave-filtering voltage stabilizing provides power supply.

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