CN201384407Y

CN201384407Y - Electric toaster with electromagnetic latch

Info

Publication number: CN201384407Y
Application number: CN200920003318U
Authority: CN
Inventors: 蔡汉文
Original assignee: Hon Way Plastic and Metal Manufacturing Co Ltd
Current assignee: LINKCO (GUANG ZHONG) ELE APP MFY Ltd
Priority date: 2009-01-19
Filing date: 2009-01-19
Publication date: 2010-01-20
Anticipated expiration: 2019-01-19

Abstract

The utility model provides an electric toaster with an electromagnetic latch. In electric toasters the bread rack is latched during toasting by an electromagnet activated by a control circuit. The first DC supply circuit includes switching means operable to supply current to the coil of the electromagnet. A first DC supply circuit is connected to a branch from the heating element through a first rectifier. A second direct current supply circuit for supplying current to the control circuit is connected to a branch between the at least one power switch and the direct current input power connection terminal through a second rectifier.

Description

Electric bread baker with electromagnetic latch

Technical field

The utility model relates to a kind of movably electrical heating bread baker of toast rack that has between ejected position that extends and retracted position, activates electromagnet by control circuit in the baking process and come the breech lock bread baker in bread baker.

Background technology

In such bread baker, in the baking operating process,, be provided with electric current to electromagnet coil for toast rack being remained on more lower position.During the baking EO, the sever supply current of electromagnet, and toast rack rises to extended position under the effect of spring.

The bread baker of the prior art of this type has power circuit, and power circuit provides AC power (AC power supplies) to heating element heater, and activates power switch by grill to moving of baking position and operate.Be used for regulating control circuit and the power circuit of baking time and be separated, the control electric current comprises power supply, integrated circuit (IC) and is used for closing the transistor switch of electromagnet.Other mode buttons of selecting by manual variable resistance, according to the user (for example, be used for reducing " heating mode again " of heat time heating time or be used for prolonging " bagel mode " of heating) come the transformation period constant, thereby finish adjusting.Power supply comprises rectifier and voltage regulator, and being used for provides DC current (DC electric current) to integrated circuit and electromagnet.Power supply is tap between attaching plug and power switch, makes whenever bread baker is inserted electrical mains, and integrated circuit all can be drawn little electric current.Though this bread baker performance of the prior art is satisfactory, the bread baker of this universal class still needs to improve reliability, and particularly electromagnet keeps the reliability of operation.

The utility model content

According to one side of the present utility model, a kind of electric bread baker is provided, comprising:

A pair of AC power supplies (AC power) binding post;

Heating element heater;

At least one power switch, described at least one power switch are connected between described AC power supplies binding post and the described heating element heater;

Toast rack, described toast rack moves to the baking position from ejected position opposing elastic device, to activate at least one power switch;

Electromagnet, described electromagnet have excitation coil and are used for toast rack is latched in the baking position;

The one DC supply circuit, a described DC supply circuit comprise and operationally be used for providing the switching device of electric current to coil, and a DC supply circuit is connected to branch road from heating element heater by first rectifier;

Control circuit, described control circuit are used for the operation of gauge tap device, and described control circuit comprises integrated circuit;

With the 2nd DC supply circuit, described the 2nd DC supply circuit is used for providing electric current to described control circuit, and described the 2nd DC supply circuit is connected to branch road between described at least one power switch and the described AC power supplies binding post by second rectifier;

Preferably, described the 2nd DC supply circuit comprises zener diode voltage regulator.

Preferably, a described DC supply circuit is isolated with photoelectrical coupler and described control circuit.

Can find, compared with prior art, can enough breech lock effects that a kind of reinforcement is provided according to circuit of the present utility model., low current control circuit and the transient process that is produced by power supply and high-current circuit or carry further improve reliability by being isolated.

Description of drawings

Following example also is described the preferred form of the utility model in conjunction with the accompanying drawings, wherein:

Fig. 1 is the electric circuit schematic diagram of bread baker of the present utility model;

Fig. 2 is the schematic diagram of the bolt lock mechanism of bread baker of the present utility model.

The specific embodiment

Referring to Fig. 1 of accompanying drawing, be connected to the electric current main line at AC binding post L shown in the right-hand side and N.Power switch 10 be triple-pole switch (comprise three one poles, single-throw switch element SW2-2, SW3-1 SW3-2) and in the following known mode of describing in detail with reference to figure 2 mechanically operates.

The heating element heater 12 that last electric current lifting-line passes to heating element heater 11 and is connected in series from normal open switch 10, element 13 is connected with 12 with element 11 in parallel simultaneously.

Heating element heater 11 comprises first divider 15 with the branch road 14 that is connected to first rectifier 15.The opposite side of first rectifier 14 is connected with following current load line from switch 10.

The one DC supply circuit 16 comprises filter condenser 17, switching transistor 18, phototransistor 19 and electromagnet coil 20 and the

resistor

21,22 of the output that strides across first rectifier 15.Resistor 21, coil 20 and switching transistor 18 are connected in series between the negative line of a DC circuit, and the emitter stage of switching transistor 18 is connected to the emitter stage of phototransistor 19 by resistance 22 simultaneously.In this mode, the operation actuation switch transistor 18 of phototransistor 19 is used for supplying with electric current to coil 20.

Be each

node

23,24 between upper and lower current load On line switch 10 and AC binding post L, N, upper and lower branch road extends to second diode rectifier 25 from node.

The 2nd DC supply circuit 26 comprises: stride across the filter condenser 27,28 of described second rectifier, 25 outputs, and resistor 29 and Zener diode 30, these devices are supplied with dc voltage Vcc as voltage-stablizer, to give integrated circuit 31 power supplies.

Microprocessor or integrated circuit 31 are parts of the control circuit 32 of known type, will not be described in detail its operating process here.Master controller in control circuit 32 and sensor comprise variable resistance 33, and variable resistance 33 is as the main device of controlling the baking degree by the timing in baking cycle.Five kinds of mode switch 33-37 are used for further control cycle (these patterns comprise " freezing ", " heating again ", " bagel " etc.), every kind of LED (light emitting diode) 38-42 that the selection mode of every kind of pattern of indication that is associated is all arranged." cancellation " switch allows every kind of pattern to be cancelled selection.Negative temperature coefficient thermistor 43 is used for monitoring temperature.

Control circuit is included in transistor 45 and the LED (light emitting diode) 46 that connects between Vcc and the ground wire.LED46 and phototransistor 19 are two elements of photoelectrical coupler or optoisolator 47.The base stage of transistor 45 is connected on the output pin of IC (integrated circuit) 31.

Activate sensing circuit 61 and be connected node 60 places between the switch 10 and heating element heater 11 in the electric current lifting-line, provide the DC signal to come indicator cock 10 to close and electric power offers element 11-13 to integrated circuit 31.Activate sensing circuit 61 and comprise diode 62 and divider 63.The output 65 that the lead (not shown) will activate sensing circuit 61 is connected to the pin 66 of IC (integrated circuit) 31.

Fig. 2 has schematically illustrated the toast rack 50 and the electromagnetic latch mechanism 51 of bread baker, and electromagnetic latch mechanism 51 is used for resisting the spring 52 that it can be advanced to extended position toast rack 50 is remained on its baking position (not showing).The

latch

53,54 of spring bias voltage is connected respectively to toast rack 50 and bread baker base 55 by pivot (arranging around orthogonal pivotal axis) separately.

Ferromagnetic block 56 is installed to latch 54, and is relative with the electromagnet coil 20 that is fixed to base.The throwing of switch 10 (throw) is schematically depicted as in abutting connection with the edge of latch 54, by its closed latch 54, and each among closed SW2-1, SW3-1 and the SW3-2 simultaneously.

In operation, when binding post L, N are connected in the supply main, electric current is supplied to the 2nd DC supply circuit by second rectifier, is used for supplying with electric current to control circuit.Want baking a slice of bread or similar thing, the user is placed on these things in the toast rack 50, and toast rack 50 is reduced to the baking position.Originally latch 53,54 is close, and parts 54 its retracting springs 58 of antagonism rotate, thus Closing Switch 10.Then, activating sensing circuit 61 provides signal to IC31, and therefore the IC31 guide current makes that photoelectrical coupler 47 can console switch transistor 18 to the base stage of transistor 45.Along with electric current flows between the collector and emitter of switching transistor 18 and flows through electromagnet coil 20, electromagnet coil 20 attracts ferromagnetic block 56.Further downward mobile ferromagnetic block 56 and the electromagnet coil 20 of making of toast rack 50 engages, and electromagnetic circuit keeps together ferromagnetic block 56 and electromagnet coil 20.Along with

latch

53,54 is bonded with each other, therefore toast rack 50 is latched in the baking position.By this way, the electric current of drawing by electromagnet coil 20 does not generally rely on the electric current of being drawn by control circuit, and obtains more powerful, more reliable breech lock effect.

The utility model each side is described by the mode of example, and what should be understood that simultaneously is, can make amendment and adds it, and can not break away from protection domain of the present utility model.

Claims

1. An electric toaster, characterized in that, comprising:

A pair of AC power terminals;

Heating element;

at least one power switch connected between the AC power terminal and the heating element;

a bread rack movable from a pop-up position to a toasting position against the resilient means to activate said at least one power switch;

an electromagnet having an energizing coil for latching the bread rack in the toasting position;

A first direct current supply circuit comprising switching means operable to supply current to said coil, said first direct current supply circuit being connected to a branch from a heating element through a first rectifier road;

a control circuit for controlling operation of the switching device, the control circuit comprising an integrated circuit; and

A second DC supply circuit, the second DC supply circuit is used to supply current to the control circuit, and the second DC supply circuit is connected between the at least one power switch and the AC power connection terminal through a second rectifier branches between.

2. The toaster of claim 1, wherein the second DC supply circuit comprises a Zener diode regulator.

3. The toaster according to claim 1 or 2, wherein the first DC supply circuit is isolated from the control circuit by a photocoupler.