CN213152034U - Startup and shutdown control circuit and cooking equipment - Google Patents
Startup and shutdown control circuit and cooking equipment Download PDFInfo
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- CN213152034U CN213152034U CN202021831530.8U CN202021831530U CN213152034U CN 213152034 U CN213152034 U CN 213152034U CN 202021831530 U CN202021831530 U CN 202021831530U CN 213152034 U CN213152034 U CN 213152034U
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Abstract
The utility model discloses a startup and shutdown control circuit and cooking equipment, wherein, the input of the time sequence switch circuit power supply circuit of startup and shutdown control circuit is connected with alternating current power supply, the output of the time sequence switch circuit power supply circuit is connected with the time sequence switch circuit, the time sequence switch circuit is respectively connected with the input of key circuit and relay drive circuit, the output of relay drive circuit is connected with the control end of relay; when a key of the key circuit is pressed in the power-off state, the time sequence switch circuit controls the relay to be attracted through the relay driving circuit, and the controlled circuit is communicated with the power supply to finish the power-on action; when the key of the key circuit is continuously pressed for more than the preset time in the starting state, the time sequence switch circuit controls the relay to be disconnected through the relay driving circuit, the controlled circuit is disconnected with the power supply, and the shutdown action is completed.
Description
Technical Field
The utility model belongs to the technical field of the culinary art and specifically relates to a switch on and off control circuit and cooking equipment are related to.
Background
In daily life, most cooking equipment powered by 220V alternating current power supply, such as an oven, a steam box, an induction cooker, a dosing machine and the like, is controlled by connecting switches in series on a zero line and a live line of the alternating current power supply, and when the switches are pressed, input power supply connection can be realized. The on-off control circuit has the characteristics of low price, but in the actual use process, under the action of conditions such as moisture, oil stain, artificial damage and the like, the hidden danger of electric leakage can be caused, and personal injury or property loss can be easily caused.
In addition, because cooking equipment is directly exposed in the air and is directly used, the cooking equipment is difficult to avoid being influenced by environments such as moisture, dust, oil stains and the like, the cooking equipment needs to be cleaned and managed frequently, a startup and shutdown key of the cooking equipment can be touched by mistake in the cleaning and management process, and the cooking equipment is easily turned off by mistake particularly when the cooking equipment is turned on.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a switching on and shutting down control circuit and cooking equipment, main aim at solve current switching on and shutting down control circuit and use unsafe and the easy technical problem who shuts down of mistake.
In order to achieve the above object, the utility model provides a startup and shutdown control circuit, which comprises a key circuit, a time sequence switch circuit power supply circuit, a relay drive circuit and a relay, wherein,
the input end of the power supply circuit of the time sequence switch circuit is connected with an alternating current power supply, the output end of the power supply circuit of the time sequence switch circuit is connected with the time sequence switch circuit, the time sequence switch circuit is respectively connected with the input ends of the key circuit and the relay drive circuit, and the output end of the relay drive circuit is connected with the control end of the relay;
when a key of the key circuit is pressed in the power-off state, the time sequence switch circuit controls the relay to be attracted through the relay driving circuit, and the controlled circuit is communicated with the power supply to finish the power-on action; when the continuous pressing of the key circuit exceeds the preset time in the starting state, the time sequence switch circuit controls the relay to be disconnected through the relay driving circuit, and the controlled circuit is disconnected with the power supply to finish the shutdown action.
In an embodiment of the present invention, optionally, the power on/off control circuit further includes a main control circuit and a main control circuit power supply circuit, the input pin and the output pin of the main control circuit are respectively connected to the time sequence switch circuit, and the voltage input pin of the main control circuit is connected to the output terminal of the relay through the main control circuit power supply circuit; when a key of the key circuit is pressed in a starting-up state, the time sequence switch circuit sends a power supply turn-off signal to the main control circuit through an input pin of the main control circuit; when the time sequence switch circuit receives a shutdown signal sent by an output pin of the main control circuit in a startup state, the time sequence switch circuit controls the relay to be disconnected through the relay driving circuit, and the main control circuit is disconnected with the power supply to complete shutdown actions.
In an embodiment of the present invention, optionally, the sequential switching circuit power supply circuit includes an ac/dc conversion module, a lead voltage dependent resistor and a first filter circuit, wherein a voltage input pin of the ac/dc conversion module is connected to a live wire, a zero line and a ground wire of an ac power supply respectively, and a live wire input pin and a zero line input pin of the ac/dc conversion module are further connected through the lead voltage dependent resistor; and a voltage output pin of the alternating current-direct current conversion module is connected with an output end of the time sequence switch circuit power supply circuit through a first filter circuit.
The utility model discloses an in an embodiment, optionally, the time sequence switch circuit includes voltage filter module, the power monitoring module, regularly adjust electric capacity and a plurality of filter circuit, wherein, voltage filter module's input links to each other with time sequence switch circuit supply circuit's output, voltage filter module's output links to each other with power monitoring module's voltage input pin, power monitoring module's key input pin passes through the second filter circuit and links to each other with key circuit, power monitoring module's enable pin passes through the third filter circuit and links to each other with relay drive circuit's input, power monitoring module's timer pin links to each other with the earthing terminal through regularly adjusting electric capacity.
In an embodiment of the present invention, optionally, the voltage filtering module includes a first protection diode and a fourth filter circuit, wherein an input end of the voltage filtering module is connected to the ground terminal through the first protection diode, and an input end of the voltage filtering module is further connected to an output end of the voltage filtering module through the fourth filter circuit.
In an embodiment of the present invention, optionally, the key circuit includes a contact switch and a second protection diode, wherein an anode of the contact switch is connected to the key signal input pin of the power monitoring module, a cathode of the contact switch is connected to the ground terminal, and the anode and the cathode of the contact switch are connected to each other through the second protection diode.
In an embodiment of the present invention, optionally, the relay driving circuit includes a field effect transistor, a fifth filter circuit and a first photoelectric coupler, wherein a gate of the field effect transistor is connected to an enable pin of the power monitoring module, a source of the field effect transistor is connected to an output terminal of the voltage filter module, a drain of the field effect transistor is connected to an anode input terminal of the first photoelectric coupler through the fifth filter circuit, and a cathode input terminal of the first photoelectric coupler is connected to the ground terminal; the output end of the emitting electrode of the first photoelectric coupler is connected with the control end of the relay, the control end of the relay is also connected with a live wire of an alternating current power supply, and the output end of the collecting electrode of the first photoelectric coupler is connected with a zero line of the alternating current power supply.
The utility model discloses an in an embodiment, optionally, the on-off control circuit is still including the direct current converting circuit who connects between master control circuit power supply circuit's output and master control circuit's voltage input pin, direct current converting circuit includes direct current conversion module, sixth filter circuit and at least one load resistance, wherein, direct current conversion module's voltage input pin links to each other with master control circuit power supply circuit's output, direct current conversion module's voltage output pin passes through sixth filter circuit and links to each other with direct current conversion circuit's output, direct current conversion circuit's output links to each other with the earthing terminal through at least one load resistance.
In an embodiment of the present invention, optionally, the power on/off control circuit further includes a first electrical isolation circuit connected between the output pins of the timing switch circuit and the main control circuit, the first electrical isolation circuit includes a second photoelectric coupler, a plurality of pull-up resistors and two phase inverters, wherein an anode input terminal of the second photoelectric coupler is connected to an output terminal of the dc conversion circuit, a cathode input terminal of the second photoelectric coupler is connected to the output pin of the main control circuit, and a cathode input terminal of the second photoelectric coupler is further connected to an output terminal of the dc conversion circuit through the pull-up resistor; the output end of the emitter of the second photoelectric coupler is connected with the grounding end, the output end of the collector of the second photoelectric coupler is connected with the power supply cut-off pin of the power supply monitoring module of the time sequence switch circuit through two serially connected inverters, and the output end of the collector of the second photoelectric coupler is also connected with the output end of the power supply circuit of the main control circuit through a pull-up resistor.
In an embodiment of the present invention, optionally, the power on/off control circuit further includes a second electrical isolation circuit connected between the input pins of the timing switch circuit and the main control circuit, the second electrical isolation circuit includes a third photoelectric coupler, a plurality of pull-up resistors and two phase inverters, wherein an anode input terminal of the third photoelectric coupler is connected to an output terminal of the main control circuit power supply circuit, a cathode input terminal of the third photoelectric coupler is connected to an external signal detection pin of the power monitoring module of the timing switch circuit through the two phase inverters connected in series, and a cathode input terminal of the third photoelectric coupler is further connected to an output terminal of the main control circuit power supply circuit through the pull-up resistor; the output end of the emitter of the third photoelectric coupler is connected with the grounding end, the output end of the collector of the third photoelectric coupler is connected with the input pin of the main control circuit, and the output end of the collector of the third photoelectric coupler is also connected with the output end of the direct current conversion circuit through the pull-up resistor.
In addition, in order to realize the above-mentioned purpose, the utility model discloses still provide a cooking equipment, cooking equipment includes the switching on and shutting down control circuit of above-mentioned arbitrary item.
The utility model provides a startup and shutdown control circuit and cooking equipment, startup and shutdown control circuit includes keying circuit, sequential switch circuit supply circuit, relay drive circuit and relay, wherein, sequential switch circuit supply circuit can get the electricity in 220V alternating current power supply, and produce the relatively safe 5V direct current voltage as the operating voltage of startup and shutdown control circuit, in this circuit, sequential switch circuit and keying circuit and relay control circuit that link to each other with sequential switch circuit all work under 5V direct current voltage, therefore can effectively avoid using the power consumption hidden danger that 220V alternating current power supply connection key switch brought, the security level of startup and shutdown control circuit has been improved, in addition, sequential switch circuit in the circuit can judge time and the chronogenesis that the button was pressed down, consequently can regard as the judgement of start or shut down, therefore, short-press startup and long-press shutdown are realized, and misoperation caused by manual cleaning and the like in work is avoided.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.
Drawings
The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:
fig. 1 shows a schematic structural diagram of a startup and shutdown control circuit provided by an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a sequential switch circuit power supply circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram illustrating a sequential switch circuit, a key circuit and a relay driving circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a circuit structure of a dc conversion circuit according to an embodiment of the present invention;
fig. 5 shows a schematic circuit structure diagram of a first electrical isolation circuit and a second electrical isolation circuit provided in an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
To further illustrate the technical means and effects of the present invention adopted to achieve the intended purpose of the present invention, the following detailed description is given with reference to the accompanying drawings and preferred embodiments, in order to explain the detailed embodiments, structures, features and effects of the present invention. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The following describes a power on/off control circuit according to some embodiments of the present invention with reference to fig. 1 to 5.
As shown in fig. 1, an embodiment of the present invention provides a power on/off control circuit. The startup and shutdown control circuit comprises a key circuit, a time sequence switch circuit power supply circuit, a relay drive circuit and a relay, wherein the input end of the time sequence switch circuit power supply circuit is connected with an alternating current power supply (AC 220V), the output end of the time sequence switch circuit power supply circuit is connected with the time sequence switch circuit, the time sequence switch circuit is respectively connected with the key circuit and the input end of the relay drive circuit, and the output end of the relay drive circuit is connected with the control end of the relay.
Specifically, the time sequence switch circuit power supply circuit is used for converting an input 220V alternating current power supply into a 5V direct current power supply and supplying power to the time sequence switch circuit through the 5V direct current power supply, the time sequence switch circuit is used for responding to pressing response of a key in the key circuit and outputting low level or high level to the relay drive circuit, so that the relay is controlled to be attracted and disconnected through the relay control circuit, and when the relay is attracted, a controlled circuit connected with the on-off control circuit is communicated with the power supply, so that the on-off action is completed. In this embodiment, the controlled circuit may include a strong current circuit such as a motor power supply circuit connected to a 220V ac power supply, or may include a weak current circuit such as a main control circuit connected to a 5V dc power supply, and when the controlled circuit includes the weak current circuit, the relay and the weak current circuit need to be connected together through an ac/dc conversion circuit.
Further, the timing control logic of the timing switch circuit may include the following: when a key of the key circuit is pressed in the power-off state, the time sequence switch circuit controls the relay to suck through the relay driving circuit, and the controlled circuit is communicated with the power supply, so that the power-on action is finished; when the keys of the key circuit are continuously pressed for more than the preset time in the starting state, the time sequence switch circuit controls the relay to be disconnected through the relay driving circuit, and the controlled circuit is disconnected with the power supply, so that the shutdown action is completed. In addition, the time sequence switch circuit also provides a soft shutdown interface, when the soft shutdown interface receives a shutdown signal, the time sequence switch circuit can control the relay to be disconnected through the relay driving circuit, and the controlled circuit is disconnected with the power supply, so that the shutdown action is completed, and the remote shutdown or the automatic shutdown after the system action is finished can be realized through the mode.
The on-off control circuit provided by the above embodiment comprises a key circuit, a time sequence switch circuit power supply circuit, a relay drive circuit and a relay, wherein the time sequence switch circuit power supply circuit can get power from a 220V alternating current power supply and generate relatively safe 5V direct current voltage as the working voltage of the on-off control circuit, in the circuit, the time sequence switch circuit, the key circuit connected with the time sequence switch circuit and the relay control circuit all work under 5V direct current voltage, so that the power utilization hidden trouble caused by connecting a 220V alternating current power supply with a key switch can be effectively avoided, the safety level of the on-off control circuit is improved, in addition, the time sequence switch circuit in the circuit can judge the pressing time and time sequence of the key, and can be used for judging the on-off or the off, thereby realizing the short-pressing on and the long-pressing off, avoiding the misoperation of shutdown caused by manual cleaning and other operations in work.
The utility model discloses an in an embodiment, optionally, as shown in FIG. 1, the on-off control circuit still includes master control circuit and master control circuit power supply circuit, and wherein, master control circuit's input pin and output pin link to each other with the time sequence switch circuit respectively, and master control circuit's voltage input pin passes through master control circuit power supply circuit and links to each other with the output of relay.
Specifically, the master control circuit can also be understood as the controlled circuit of the on-off control circuit, the master control circuit can be connected with the output end of the relay through the master control circuit power supply circuit, when the time sequence switch circuit controls the relay to be attracted through the relay drive circuit, the master control circuit power supply circuit is connected with the alternating current power supply, at the moment, the master control circuit power supply circuit can convert the input alternating current power supply into a 5V direct current power supply and supply power for the master control circuit, in addition, the input pin and the output pin of the master control circuit are also respectively connected with the time sequence switch circuit, and therefore communication between the master control circuit and the time sequence switch circuit is achieved.
Further, the sequential control logic between the sequential switch circuit and the main control circuit may include the following modes: when a key of the key circuit is pressed in a power-on state, the time sequence switch circuit sends a power supply turn-off signal to the main control circuit through an input pin of the main control circuit, and at the moment, the main control circuit can execute data processing and data storage operation before power-off; after the main control circuit finishes the data processing and data storage operation, a shutdown signal is sent to the time sequence switch circuit through an output pin of the main control circuit, and after the time sequence switch circuit receives the signal, the relay can be controlled to be disconnected through the relay driving circuit, so that the main control circuit is disconnected from the power supply, and the shutdown action is finished. In addition, the sequential control logic may also be implemented by a programming device, that is, the programming device may perform sequential logic determination on the input signal and execute the shutdown function according to the sequential logic determination result, for example, the programming device may determine the input key signal and the shutdown signal, and execute the shutdown function when it is determined that the key signal reaches the predetermined duration or the shutdown signal reaches the preset condition.
The utility model discloses an in an embodiment, optionally, the time sequence switch circuit power supply circuit of on & off control circuit includes the AC/DC conversion module, lead wire piezo-resistor and first filter circuit, wherein, the voltage input pin of AC/DC conversion module links to each other with AC power supply's live wire, zero line and earth connection respectively, the live wire input pin and the zero line input pin of AC/DC conversion module still link to each other through lead wire piezo-resistor, the voltage output pin of AC/DC conversion module links to each other through first filter circuit and time sequence switch circuit power supply circuit's output.
Specifically, the alternating current-direct current conversion module can convert a 220V alternating current power supply connected with the alternating current-direct current conversion module into a 5V direct current power supply, a lead voltage dependent resistor is further connected between a live wire input pin and a zero line input pin of the alternating current-direct current conversion module, the lead voltage dependent resistor is a voltage limiting type protection device, and when overvoltage is borne between two poles of the lead voltage dependent resistor, voltage can be clamped to a relatively fixed voltage value by utilizing the nonlinear characteristic of the lead voltage dependent resistor, so that the protection of a rear-stage circuit is realized. In addition, a voltage output pin of the alternating current-direct current conversion module is also connected with a filter circuit, and the filter circuit can filter the output 5V direct current power supply, so that the quality of the output power supply is improved.
Further, a circuit implementation manner of the power supply circuit of the sequential switch circuit is shown in fig. 2, wherein a live wire input pin (ACN) of the ac/dc conversion module U8 is connected to a live wire (N) of the ac power supply, a null line input pin (ACL) of the ac/dc conversion module U8 is connected to a null wire (L) of the ac power supply, a ground input pin (FG) of the ac/dc conversion module U8 is connected to a ground wire (PE) of the ac power supply, a live wire input pin (ACN) and a null line input pin (ACL) of the ac/dc conversion module U8 are further connected through a lead voltage dependent resistor GV2 to clamp an overvoltage of the input power supply and protect a subsequent stage circuit, voltage output pins (V + and V-) of the ac/dc conversion module U8 are connected to an output terminal +5V _ PWR of the power supply circuit of the sequential switch circuit through a first filter circuit composed of an electrolytic filter capacitor E2 and a capacitor C16, thereby improving the quality of the output power supply. In addition, the power supply circuit of the main control circuit mentioned in the above embodiment may also be implemented by such a circuit, wherein the input terminal of the power supply circuit of the main control circuit is connected to the output terminal of the relay, and the output terminal thereof is connected to the main control circuit.
The utility model discloses an in an embodiment, optionally, the time sequence switch circuit of on-off control circuit includes voltage filter module, power monitoring module, regularly adjust electric capacity and a plurality of filter circuit, wherein, voltage filter module's input links to each other with time sequence switch circuit supply circuit's output, voltage filter module's output links to each other with power monitoring module's voltage input pin, power monitoring module's key input pin passes through the second filter circuit and links to each other with key circuit, power monitoring module's enable pin passes through the third filter circuit and links to each other with relay drive circuit's input, power monitoring module's timer pin passes through regularly to adjust electric capacity and links to each other with the earthing terminal.
Specifically, voltage filter module connects between time sequence switch circuit supply circuit and power monitoring module, can carry out filtering process and voltage protection to time sequence switch circuit's input voltage through components and parts such as filter capacitance, filter inductance and protection diode and handle, it is further, power monitoring module links to each other with button circuit and relay drive circuit, through the button action in the button circuit, can control power monitoring module's sequential logic, thereby make power monitoring module's enable pin output low level or high level respectively, and then control relay drive circuit drive relay actuation or disconnection, with this start-up and shut-down action of accomplishing the circuit. In addition, the power supply monitoring module is also connected with a timing adjusting capacitor, the time length of the time sequence switch circuit for long key-press shutdown can be controlled by adjusting the capacity of the timing adjusting capacitor, the power supply monitoring module also comprises a plurality of filter circuits, a pull-up circuit, a current-limiting resistor and other components, and the components can enable the power supply monitoring module to run more safely and stably.
Further, a circuit implementation manner of the sequential switch circuit is shown in fig. 3, wherein a voltage input pin (VIN) of the power supply monitoring module U2 is connected to an output terminal of a power supply circuit of the sequential switch circuit through a voltage filter circuit to introduce a dc power supply to supply power to the power supply monitoring module U2, and the voltage input pin (VIN) is further connected to a filter circuit composed of R5 and C6 to improve the quality of the input power supply; a power supply starting pin (ON) is connected with the grounding end to start the power supply monitoring module; a power supply cut-off pin (KILL) is connected with an output pin of the main control circuit through a filter circuit consisting of R6 and C6 so as to receive a shutdown signal sent by the main control circuit; the key signal input Pin (PB) is connected with the key circuit through a filter circuit consisting of R7 and C7 so as to respond to the key action of the key circuit; the enable pin (EN) is connected with the output end of the relay drive circuit through a filter circuit consisting of R4 and C10, and is also connected with the output end of the voltage filter circuit through a pull-up resistor R2 to control the relay drive circuit to work; the external signal detection pin (INT) is connected with an input pin of the main control circuit through a filter circuit consisting of C4, and is also connected with the output end of the voltage filter circuit through a pull-up resistor R1 so as to send a power supply turn-off signal to the main control circuit; the timer pin (TMR) is connected with the grounding end through a timing adjusting capacitor C3 to adjust the time parameter of key-press shutdown; the grounding pin (GND) is connected with the grounding end so that the power supply monitoring module can work normally.
In an embodiment of the present invention, optionally, the voltage filtering module of the sequential switching circuit includes a first protection diode and a fourth filter circuit, wherein the input terminal of the voltage filtering module is connected to the ground terminal through the first protection diode, and the input terminal of the voltage filtering module is further connected to the output terminal of the voltage filtering module through the fourth filter circuit.
Specifically, the fourth filter circuit can be composed of components such as an inductor and a capacitor, so as to realize the filtering processing of the direct-current power supply input by the power supply circuit of the time-sequence switch circuit and improve the power supply quality; the first protection diode can protect the time sequence switch circuit from being damaged by voltage spikes introduced by the lead, thereby protecting the safety of the rear-stage circuit. Further, a circuit implementation manner of the voltage filter circuit is shown in fig. 3, wherein an input end of the voltage filter circuit is connected to the +5V _ PWR output end of the time sequence switch circuit power supply circuit, an input end of the voltage filter circuit is further connected to a ground end through a bidirectional TVS diode TVS1 and a filter capacitor C1, an output end of the voltage filter circuit is connected to an input end of the voltage filter circuit through a filter inductor B1, and an output end of the voltage filter circuit is further connected to the ground end through a filter capacitor C2, wherein the bidirectional TVS diode TVS1 can suppress an excessive voltage exceeding a breakdown voltage thereof to protect the time sequence switch circuit from a voltage spike introduced by a wire, the filter inductor B1 can eliminate high-frequency noise in the dc voltage, and the filter capacitors C1 and C2 can filter and decouple the input dc voltage to improve power quality.
In an embodiment of the present invention, optionally, the key circuit of the on/off control circuit includes a contact switch and a second protection diode, wherein the anode of the contact switch is connected to the key signal input pin of the power monitoring module, the cathode of the contact switch is connected to the ground terminal, and the anode and the cathode of the contact switch are connected to each other through the second protection diode.
Specifically, the second protection diode can protect the sequential switch circuit from being interfered by electrostatic signals introduced by the keys, so that the safety of a rear-stage circuit is protected. Further, a circuit implementation manner of the key circuit is shown in fig. 3, wherein an anode PB + of the contact switch P1 is connected to a key signal input pin of the power monitoring module U2, a cathode PB-of the contact switch P1 is connected to a ground terminal, and an anode PB + and a cathode PB-of the contact switch P1 are connected through a second protection diode TVS4, so as to protect the timing switch circuit from electrostatic signal interference introduced by the key.
In an embodiment of the present invention, optionally, the relay driving circuit of the power on/off control circuit includes a field effect transistor, a fifth filter circuit and a first photoelectric coupler, wherein a gate of the field effect transistor is connected to an enable pin of the power monitoring module, a source of the field effect transistor is connected to an output terminal of the voltage filter module, a drain of the field effect transistor is connected to an anode input terminal of the first photoelectric coupler through the fifth filter circuit, and a cathode input terminal of the first photoelectric coupler is connected to the ground terminal; the output end of the emitting electrode of the first photoelectric coupler is connected with the control end of the relay, the control end of the relay is also connected with a live wire of an alternating current power supply, and the output end of the collecting electrode of the first photoelectric coupler is connected with a zero line of the alternating current power supply.
Specifically, the relay driving circuit may be a field effect transistor switching circuit, and the principle of the circuit is to control the on/off of a source(s) and a drain (d) by using a gate (g) of a field effect transistor, in this embodiment, the field effect transistor may be a P-type field effect transistor, that is, when a voltage (Vgs) between the gate and the source of the field effect transistor is smaller than a certain threshold, the source and the drain are turned on, so that the drain of the field effect transistor is connected to the output terminal of the voltage filtering module, further, an anode input terminal of the first photoelectric coupler is connected to a 5V high level, the first photoelectric coupler is turned on, an emitter output terminal of the first photoelectric coupler is connected to a collector output terminal, so that a zero line of an ac power supply connected to a collector is connected to a control terminal of the relay, and the control terminal of the relay is connected to a live line and a zero line of the ac power supply respectively, the controlled circuit is communicated with a power supply, the relay driving circuit provided by the embodiment utilizes the photoelectric coupler to maintain a good electric signal isolation effect, and can quickly realize the transmission of electric signals.
Further, a circuit implementation manner of the relay driving circuit is shown in fig. 3, wherein a gate of the fet G1 is connected to an enable pin (EN) of the power monitoring module U2 through a filter circuit of the sequential switching circuit, a source of the fet G1 is connected to an output terminal of a voltage filter circuit of the sequential switching circuit, a drain of the fet G1 is connected to an anode input terminal of the first photocoupler U1A through a filter circuit composed of a resistor R3 and a capacitor C9, where a switching circuit of the fet is formed, further, a cathode input terminal of the first photocoupler U1A is connected to a ground terminal, an anode input terminal of the first photocoupler U1A is further connected to a cathode input terminal of the first photocoupler U1A through a protection diode D3 connected in a reverse direction, so as to protect the relay driving circuit from a voltage spike introduced by a wire, and further, the emitter output of first optoelectronic coupler U1A links to each other with the one end of the control end of relay, the other end of the control end of relay links to each other with alternating current power supply's live wire, the collecting electrode output of first optoelectronic coupler links to each other with alternating current power supply's zero line, when optoelectronic coupler U1A switched on, the emitter output of first optoelectronic coupler U1A links to each other with the collecting electrode output, make the control end of relay link to each other with alternating current power supply's live wire and zero line respectively, thereby realized switching on of power, wherein, the relay specifically can be ac contactor.
The utility model discloses an in an embodiment, optionally, the on-off control circuit is still including the direct current converting circuit who connects between master control circuit power supply circuit's output and master control circuit's voltage input pin, direct current converting circuit includes direct current conversion module, sixth filter circuit and at least one load resistance, wherein, direct current conversion module's voltage input pin links to each other with master control circuit power supply circuit's output, direct current conversion module's voltage output pin passes through sixth filter circuit and links to each other with direct current conversion circuit's output, direct current conversion circuit's output links to each other with the earthing terminal through at least one load resistance.
Specifically, the direct current conversion circuit can play a role in electric signal isolation, although the input signal and the output signal of the direct current conversion circuit are 5V direct current voltages, the 5V direct current voltages output by the direct current conversion circuit can effectively reduce signal interference caused by high voltage, so that the safety and the stability of the startup and shutdown control circuit are improved, in addition, a filter circuit in the circuit can carry out filtering and decoupling processing on the input end voltage and the output end voltage, the quality of a power supply is improved, the voltage stability is improved, furthermore, the voltage stability can also be improved through a load resistor in the direct current conversion circuit, the rapid power failure during shutdown can be realized, and the safety of the circuit is further improved.
Further, a circuit implementation manner of the dc conversion circuit is shown in fig. 4, wherein a high voltage input pin (VS1/VS2) of the dc conversion module U5 is connected to the output terminal +5V _ PWR of the main control circuit power supply circuit through the filter capacitors C12 and C13, a low voltage input pin (OIN1/OIN2) of the dc conversion module U5 is connected to the ground terminal, the circuit completes the input of 5V direct current voltage, furthermore, a high-voltage output pin (VOUT1/VOUT2) of the direct current conversion module U5 is connected with an output end +5V _ ISO of the direct current conversion circuit through an LC resonance circuit consisting of L2, C14 and C15, the output end +5V _ ISO of the direct current conversion circuit is also connected with a ground end through load resistors R14 and R15, a low-voltage output pin (OOUT1/OOUT2) of the direct current conversion module U5 is connected with the ground end, and the circuit completes the output of high-quality 5V direct current voltage.
In an embodiment of the present invention, the power on/off control circuit optionally further comprises a first electrical isolation circuit connected between the timing switch circuit and the output pin of the main control circuit, the first electrical isolation circuit comprises a second photocoupler, a plurality of pull-up resistors and two inverters, the positive electrode input end of the second photoelectric coupler is connected with the output end of the direct current conversion circuit, the negative electrode input end of the second photoelectric coupler is connected with an output pin of the main control circuit, the negative electrode input end of the second photoelectric coupler is connected with the output end of the direct current conversion circuit through a pull-up resistor, the emitter output end of the second photoelectric coupler is connected with the grounding end, the collector output end of the second photoelectric coupler is connected with a power supply cut-off pin of a power supply monitoring module of the time sequence switch circuit through two series-connected inverters, and the collector output end of the second photoelectric coupler is connected with the output end of the power supply circuit of the main control circuit through the pull-up resistor.
Specifically, first electric isolating circuit can play the effect of signal of telecommunication isolation, and first electric isolating circuit can separate switch machine control circuit and the signal of telecommunication by control circuit (master control circuit) promptly, and wherein, two inverters can play the effect of reinforcing signal, and second photoelectric coupler can play the effect of signal of telecommunication isolation, through this kind of mode, can make switch machine control circuit when the signal of telecommunication disturbance appears, still can guarantee master control circuit's safety and stability operation.
Further, a circuit implementation manner of the first electrical isolation circuit is shown IN fig. 5, wherein an anode input end of a second photocoupler U6 of the first electrical isolation circuit is connected to an output terminal +5V _ ISO of the dc conversion circuit, a cathode input end of a second photocoupler U6 is connected to an output pin POWOFFF _ IN of the main control circuit through a current limiting resistor R20, a cathode input end of a second photocoupler U6 is further connected to an output terminal +5V _ ISO of the dc conversion circuit through a pull-up resistor R18, and an anode input end of a second photocoupler U6 is connected to a cathode input end of a second photocoupler U6 through a protection diode D1 connected IN a reverse direction; the emitter output end of the second photoelectric coupler U6 is connected with the ground terminal, the collector output end of the second photoelectric coupler U6 is connected with a power supply cut-off pin KILL of the power supply monitoring module through two serially connected inverters U3A and U3B and a current-limiting resistor R11, and the collector output end of the second photoelectric coupler U6 is further connected with the output end +5V _ PWR of the power supply circuit of the main control circuit through a pull-up resistor R9.
The utility model discloses an in an embodiment, optionally, the on-off control circuit is still including connecting the second electric isolating circuit between sequential switch circuit and master control circuit's input pin, second electric isolating circuit includes third photoelectric coupler, a plurality of pull-up resistance and two inverters, wherein, third photoelectric coupler's positive pole input links to each other with master control circuit supply circuit's output, third photoelectric coupler's negative pole input links to each other with sequential switch circuit's power monitoring module's external signal detection pin through two inverters of establishing ties, third photoelectric coupler's negative pole input still links to each other with master control circuit supply circuit's output through pull-up resistance, third photoelectric coupler's projecting pole output links to each other with the earthing terminal, third photoelectric coupler's collecting electrode output links to each other with master control circuit's input pin, third photoelectric coupler's collecting electrode output still links to each other with direct current conversion circuit's output through pull-up resistance .
Specifically, the second electric isolation circuit is the same as the first electric isolation circuit in function, and also plays a role in electric signal isolation, namely the second electric isolation circuit can also separate the on-off control circuit from the electric signal of the controlled circuit (main control circuit), wherein two phase inverters can play a role in enhancing signals, and the third photoelectric coupler can play a role in electric signal isolation.
Further, a circuit implementation manner of the second electrical isolation circuit is shown in fig. 5, wherein an anode input terminal of a third photocoupler U7 is connected to an output terminal +5V _ PWR of the main control circuit power supply circuit through a current limiting resistor R16, a cathode input terminal of a third photocoupler U7 is connected to an external signal detection pin PWR _ KEY of the power monitoring module through two serially connected inverters U3D and U3E, a cathode input terminal of a third photocoupler U7 is further connected to an output terminal +5V _ PWR of the main control circuit power supply circuit through a pull-up resistor R10, an anode input terminal of a third photocoupler U7 is connected to a cathode input terminal of a third photocoupler U7 through a reverse-connected protection diode D2, an emitter output terminal of the third photocoupler U7 is connected to a ground terminal, a collector output terminal of a third photocoupler U7 is connected to an input pin PWR _ KEY _ OUT of the main control circuit, the collector output end of the third photocoupler U7 is also connected with the output end +5V _ ISO of the direct current conversion circuit through a pull-up resistor R17.
On the other hand, the embodiment of the utility model provides a cooking equipment, this cooking equipment includes a switching on and shutting down control circuit, this switching on and shutting down control circuit includes keying circuit, time sequence switch circuit supply circuit, relay drive circuit and relay, wherein, time sequence switch circuit supply circuit's input links to each other with alternating current power supply (AC 220V), time sequence switch circuit supply circuit's output links to each other with time sequence switch circuit, time sequence switch circuit links to each other with keying circuit and relay drive circuit's input respectively, relay drive circuit's output links to each other with the control end of relay.
Specifically, the time sequence switch circuit power supply circuit is used for converting an input 220V alternating current power supply into a 5V direct current power supply and supplying power to the time sequence switch circuit through the 5V direct current power supply, the time sequence switch circuit is used for responding to pressing response of keys in the key circuit and outputting low level or high level to the relay drive circuit, so that the relay is controlled to be attracted and disconnected through the relay control circuit, when the relay is attracted, other controlled circuits of cooking equipment connected with the on-off control circuit are communicated with the power supply, and therefore starting action is completed.
Further, the timing control logic of the timing switch circuit may include the following: when the key of the key circuit is pressed in the off state, the time sequence switch circuit can control the relay to be attracted through the relay driving circuit, and the controlled circuit of the cooking equipment is communicated with the power supply, so that the starting action is finished; when the keys of the key circuit are continuously pressed for more than the preset time in the starting state, the time sequence switch circuit can control the relay to be disconnected through the relay driving circuit, and the controlled circuit of the cooking equipment is disconnected with the power supply, so that the shutdown action is completed.
The cooking equipment provided by the embodiment can get electricity in a 220V alternating-current power supply, and relatively safe 5V direct-current voltage is generated to serve as working voltage of the on-off control circuit, in the circuit, the time sequence switch circuit, the key circuit connected with the time sequence switch circuit and the relay control circuit all work under 5V direct-current voltage, so that the potential power utilization hazard caused by the fact that the 220V alternating-current power supply is connected with the key switch can be effectively avoided, the safety level of the cooking equipment is improved, in addition, the time sequence switch circuit in the circuit can judge the time and the time sequence of pressing down the key, and the judgment of on-off or off-can be carried out, so that short-time pressing on-off and long-time pressing off-off are realized, and the phenomenon that mistaken off is caused by manual cleaning and.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (11)
1. The on-off control circuit is characterized by being applied to cooking equipment and comprising a key circuit, a time sequence switch circuit power supply circuit, a relay drive circuit and a relay,
the input end of the power supply circuit of the time sequence switch circuit is connected with an alternating current power supply, the output end of the power supply circuit of the time sequence switch circuit is connected with the time sequence switch circuit, the time sequence switch circuit is respectively connected with the input ends of the key circuit and the relay drive circuit, and the output end of the relay drive circuit is connected with the control end of the relay;
when the key of the key circuit is pressed in the power-off state, the time sequence switch circuit controls the relay to be attracted through the relay driving circuit, and the controlled circuit is communicated with the power supply to finish the power-on action; when the key of the key circuit is continuously pressed for more than the preset time in the starting state, the sequential switch circuit controls the relay to be disconnected through the relay driving circuit, and the controlled circuit is disconnected with the power supply to finish the action of shutdown.
2. The on-off control circuit according to claim 1, further comprising a main control circuit and a main control circuit power supply circuit, wherein an input pin and an output pin of the main control circuit are respectively connected to the sequential switch circuit, and a voltage input pin of the main control circuit is connected to the output terminal of the relay through the main control circuit power supply circuit;
when a key of the key circuit is pressed in a starting-up state, the time sequence switch circuit sends a power supply turn-off signal to the main control circuit through an input pin of the main control circuit; when the time sequence switch circuit receives a shutdown signal sent by an output pin of the main control circuit in a startup state, the time sequence switch circuit controls the relay to be disconnected through the relay driving circuit, and the main control circuit is disconnected with the power supply to complete shutdown actions.
3. The on-off control circuit of claim 1, wherein the sequential switching circuit supply circuit comprises an AC/DC conversion module, a lead voltage dependent resistor and a first filter circuit,
the voltage input pin of the alternating current-direct current conversion module is respectively connected with a live wire, a zero line and a grounding wire of the alternating current power supply, and the live wire input pin and the zero line input pin of the alternating current-direct current conversion module are also connected through the lead piezoresistor; and a voltage output pin of the alternating current-direct current conversion module is connected with the output end of the time sequence switch circuit power supply circuit through the first filter circuit.
4. The on-off control circuit of claim 1, wherein the sequential switching circuit comprises a voltage filtering module, a power monitoring module, a timing adjustment capacitor, and a plurality of filtering circuits, wherein,
the input end of the voltage filtering module is connected with the output end of the time sequence switch circuit power supply circuit, the output end of the voltage filtering module is connected with the voltage input pin of the power supply monitoring module, the key input pin of the power supply monitoring module is connected with the key circuit through the second filtering circuit, the enabling pin of the power supply monitoring module is connected with the input end of the relay driving circuit through the third filtering circuit, and the timer pin of the power supply monitoring module is connected with the grounding end through the timing adjusting capacitor.
5. The on/off control circuit of claim 4, wherein the voltage filter module comprises a first protection diode and a fourth filter circuit, wherein,
the input end of the voltage filtering module is connected with the ground end through the first protection diode, and the input end of the voltage filtering module is also connected with the output end of the voltage filtering module through the fourth filtering circuit.
6. The on/off control circuit of claim 4, wherein the key circuit comprises a contact switch and a second protection diode, wherein,
the anode of the contact switch is connected with a key signal input pin of the power supply monitoring module, the cathode of the contact switch is connected with the grounding end, and the anode and the cathode of the contact switch are connected through the second protection diode.
7. The on/off control circuit according to claim 4, wherein the relay driving circuit comprises a field effect transistor, a fifth filter circuit, and a first photocoupler, wherein,
the grid electrode of the field effect transistor is connected with an enabling pin of the power supply monitoring module, the source electrode of the field effect transistor is connected with the output end of the voltage filtering module, the drain electrode of the field effect transistor is connected with the anode input end of the first photoelectric coupler through the fifth filtering circuit, and the cathode input end of the first photoelectric coupler is connected with the ground terminal;
the output end of the emitting electrode of the first photoelectric coupler is connected with the control end of the relay, the control end of the relay is also connected with the live wire of the alternating current power supply, and the output end of the collecting electrode of the first photoelectric coupler is connected with the zero line of the alternating current power supply.
8. The on-off control circuit of claim 2, further comprising a DC conversion circuit connected between the output of the main control circuit power supply circuit and the voltage input pin of the main control circuit, the DC conversion circuit comprising a DC conversion module, a sixth filter circuit and at least one load resistor, wherein,
and a voltage input pin of the direct current conversion module is connected with an output end of the power supply circuit of the main control circuit, a voltage output pin of the direct current conversion module is connected with an output end of the direct current conversion circuit through the sixth filter circuit, and an output end of the direct current conversion circuit is connected with a ground end through the at least one load resistor.
9. The on-off control circuit of claim 8, further comprising a first electrical isolation circuit connected between the timing switch circuit and the output pin of the main control circuit, the first electrical isolation circuit comprising a second optocoupler, a plurality of pull-up resistors, and two inverters, wherein,
the anode input end of the second photoelectric coupler is connected with the output end of the direct current conversion circuit, the cathode input end of the second photoelectric coupler is connected with the output pin of the main control circuit, and the cathode input end of the second photoelectric coupler is also connected with the output end of the direct current conversion circuit through a pull-up resistor;
the output end of the emitter of the second photoelectric coupler is connected with the ground terminal, the output end of the collector of the second photoelectric coupler is connected with the power supply cut-off pin of the power supply monitoring module of the time sequence switching circuit through two series-connected inverters, and the output end of the collector of the second photoelectric coupler is also connected with the output end of the power supply circuit of the main control circuit through a pull-up resistor.
10. The on-off control circuit of claim 8, further comprising a second electrical isolation circuit connected between the timing switch circuit and the input pin of the master control circuit, the second electrical isolation circuit comprising a third optocoupler, a plurality of pull-up resistors, and two inverters, wherein,
the anode input end of the third photoelectric coupler is connected with the output end of the main control circuit power supply circuit, the cathode input end of the third photoelectric coupler is connected with an external signal detection pin of the power supply monitoring module of the time sequence switch circuit through two series-connected inverters, and the cathode input end of the third photoelectric coupler is also connected with the output end of the main control circuit power supply circuit through a pull-up resistor;
and the output end of the collector of the third photoelectric coupler is connected with the output end of the direct current conversion circuit through a pull-up resistor.
11. A cooking apparatus comprising the on/off control circuit according to any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021831530.8U CN213152034U (en) | 2020-08-27 | 2020-08-27 | Startup and shutdown control circuit and cooking equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021831530.8U CN213152034U (en) | 2020-08-27 | 2020-08-27 | Startup and shutdown control circuit and cooking equipment |
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| Publication Number | Publication Date |
|---|---|
| CN213152034U true CN213152034U (en) | 2021-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021831530.8U Active CN213152034U (en) | 2020-08-27 | 2020-08-27 | Startup and shutdown control circuit and cooking equipment |
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| Country | Link |
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| CN (1) | CN213152034U (en) |
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