CN116741577A - Circuit and device of power supply safety controller - Google Patents

Abstract

The application provides a circuit and a device of a power supply safety controller, and relates to the technical field of power electronic control. The circuit comprises a switching power supply circuit, a relay unit and a switch control circuit, wherein the input end of the switching power supply circuit is used for being connected with external alternating current, one end of the switch control circuit is connected with the negative electrode output end of the switching power supply circuit, the other end of the switch control circuit is connected with the positive electrode output end of the switching power supply circuit through a control loop of the relay unit, one end of an output loop of the relay unit is connected with the positive electrode input end of the switching power supply, the other end of the output loop of the relay unit is used for outputting power supply voltage, and the switch control circuit is used for receiving a switching signal input by a user and controlling the current of the control loop of the relay unit to be conducted or cut off after amplification processing is carried out based on the switching signal. According to the technical scheme, when the switch is in ultra-low direct current voltage and ultra-low current, the on-off of the high-voltage power supply can be controlled, and an arc can not be generated near the switch.

Description

Circuit and device of power supply safety controller

Technical Field

The application relates to the technical field of power electronic control, in particular to a circuit and a device of a power supply safety controller.

Background

The magnitude of the current flowing through the human body is known to be related to the applied voltage and the human body resistance according to ohm's law (i=u/R). Many factors affect the body resistance, for example, the body resistance will drop when the hands are wet. Therefore, the magnitude of the current flowing through the human body cannot be calculated in advance, so that in order to ensure the safety of electricity, the current is generally not used, but the safe voltage is used for estimation, and the current is generally 24V or 12V.

In daily life, the switch of household lamps and lanterns and other electrical appliances is directly connected on 220V voltage. If the switch has the condition of electricity leakage, a user can possibly directly contact 220V voltage (far greater than the safety voltage of a human body) when pressing the switch, so that a safety accident occurs. Or when the switch is in the condition that dust and dangerous gas are fully distributed in the air, the risk of dust explosion and gas explosion can be caused by electric arcs appearing at the moment of switching on or switching off the switch.

Disclosure of Invention

In order to solve the above problems, the present application provides a circuit and a device for a power safety controller, which can control the on-off of a high voltage power supply when a switch is under ultra-low dc voltage and ultra-low current, and can not generate an arc near the switch.

The application is realized in the following way:

in a first aspect, the present application provides a circuit of a power safety controller, including a switching power supply circuit, a relay unit, and a switching control circuit, where an input end of the switching power supply circuit is connected to an external ac power, one end of the switching control circuit is connected to a negative output end of the switching power supply circuit, and the other end of the switching control circuit is connected to a positive output end of the switching power supply circuit through a control loop of the relay unit, one end of an output loop of the relay unit is connected to a positive input end of the switching power supply, the other end of the output loop is used to output a supply voltage, and the switching control circuit is used to receive a switching signal input by a user, and after amplifying based on the switching signal, control current of the control loop of the relay unit to be turned on or off.

Further, based on the foregoing scheme, a temperature protection circuit is further included; the input end of the temperature protection circuit is connected with the positive electrode output end of the switching power supply circuit, and the output end of the temperature protection circuit is connected with the switching control circuit through the control loop of the relay unit.

Further, based on the foregoing scheme, the switching power supply circuit is a switching power supply module, the relay unit includes a solid state relay J1, and the switching control circuit includes a transistor Q1, a diode D2, a diode D3, a switch S1, and a fuse F1; the input end of the switch power supply module is connected with external alternating current, one end of an output loop of the solid state relay J1 is connected with the positive electrode input end of the switch power supply module, the other end of the output loop is used for outputting power supply voltage, an emitter of the triode Q1 is connected with the positive electrode output end of the switch power supply module through a control loop of the solid state relay J1, a collector of the triode Q1 is connected with the negative electrode output end of the switch power supply module, a base of the triode Q1 is connected with a cathode of the diode D1, an anode of the diode D1 is connected with a collector of the triode Q1, an anode of the diode D2 is connected with an anode of the diode D1, a cathode of the diode D2 is connected with a cathode of the diode D1, an anode of the diode D3 is connected with an anode of the diode D2 through the fuse F1, and the switch S1 is connected with the diode D3 in parallel.

Further, based on the foregoing scheme, the relay unit further includes a solid state relay J2, and the switch control circuit further includes a transistor Q2, a diode D4, a diode D5, a diode D6, a switch S2, and a fuse F2; one end of the output loop of the solid state relay J2 is connected to the positive input end of the switching power supply module, the other end is used for outputting another path of supply voltage, the emitter of the triode Q2 is connected to the positive output end of the switching power supply module through the control loop of the solid state relay J2, the collector of the triode Q2 is connected to the negative output end of the switching power supply module, the base of the triode Q2 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the collector of the triode Q2, the anode of the diode D5 is connected to the anode of the diode D4, the cathode of the diode D5 is connected to the cathode of the diode D4, the anode of the diode D6 is connected to the anode of the diode D5, and the cathode of the diode D6 is connected to the cathode of the diode D5 through the fuse F2, and the switch S1 is connected in parallel to the diode D6.

Further, based on the foregoing scheme, the switching power supply circuit is a switching power supply module, the relay unit includes an electromechanical relay J3, and the switching control circuit includes a transistor Q3, a diode D1, a diode D2, a diode D3, a switch S1, a fuse F1, and a diode D7; the input end of the switching power supply module is connected with external alternating current, one end of an output loop of the electromechanical relay J3 is connected with the positive electrode input end of the switching power supply module, the other end of the output loop is used for outputting power supply voltage, an emitter of the triode Q3 is connected with an anode of the diode D7, a cathode of the diode D7 is connected with the positive electrode input end of the switching power supply module, an emitter of the triode Q3 is connected with the positive electrode output end of the switching power supply module through a control loop of the electromechanical relay J3, a collector of the triode Q3 is connected with a negative electrode output end of the switching power supply module, a base of the triode Q3 is connected with a cathode of the diode D1, an anode of the diode D1 is connected with a collector of the triode Q3, an anode of the diode D2 is connected with an anode of the diode D1, a cathode of the diode D2 is connected with a cathode of the diode D1, an anode of the diode D3 is connected with the diode F1 in parallel through the diode F1.

Further, based on the foregoing scheme, the relay unit further includes an electromechanical relay J4, and the switch control circuit further includes a transistor Q4, a diode D5, a diode D6, a switch S2, a fuse F2, and a diode D8; one end of the output loop of the electromechanical relay J4 is connected to the positive input end of the switching power supply module, the other end is used for outputting another path of supply voltage, the emitter of the triode Q4 is connected to the positive output end of the switching power supply module through the control loop of the electromechanical relay J4, the emitter of the triode Q4 is connected to the anode of the diode D8, the cathode of the diode D8 is connected to the positive input end of the switching power supply module, the collector of the triode Q4 is connected to the negative output end of the switching power supply module, the base of the triode Q4 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the collector of the triode Q4, the anode of the diode D5 is connected to the anode of the diode D4, the cathode of the diode D5 is connected to the cathode of the diode D4, the anode of the diode D6 is connected to the anode of the diode D5, and the cathode of the diode D6 is connected to the diode D1 through the fuse F2.

Further, based on the foregoing scheme, the power supply further includes a temperature protector RT1, where the temperature protector RT1 is connected in series to the positive output terminal of the switching power supply module.

Further, based on the foregoing scheme, the switching power supply further includes a resistor R1, where the resistor R1 is connected in series to the positive output terminal of the switching power supply module.

In a second aspect, the present application provides a device for a power safety controller, comprising a housing and a circuit board provided with a circuit for any one of the power safety controllers of the first aspect, wherein the circuit board is disposed in the housing and is entirely encapsulated after assembly to form a solid state.

Compared with the prior art, the application has at least the following advantages or beneficial effects:

through optimizing circuit structure, can be in the switch when ultralow direct current voltage, ultralow electric current, can control the break-make of high voltage power to can not produce electric arc spark near the switch, can make operating personnel can safe and reliable control the break-make of the higher voltage class's of power.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a block diagram illustrating a circuit configuration of a power safety controller according to an embodiment of the present application;

FIG. 2 is a block diagram of a circuit configuration of a power safety controller according to another embodiment of the present application;

FIG. 3 is a schematic diagram of an embodiment of a power safety controller according to the present application;

FIG. 4 is a schematic circuit diagram of a power safety controller according to another embodiment of the present application;

FIG. 5 is a schematic circuit diagram of another embodiment of a power safety controller according to the present application;

fig. 6 is a circuit diagram of a power safety controller according to another embodiment of the present application.

Icon: 1. a switching power supply circuit; 2. a relay unit; 3. a switch control circuit; 4. a temperature protection circuit.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Examples

Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The various embodiments and features of the embodiments described below may be combined with one another without conflict.

In the prior art, the switching mechanism is directly connected into the power supply loop, and the on-off of the power supply loop can be controlled through the opening and closing of the switching mechanism. Because the switching mechanism is directly connected in series with the power supply loop, if the switching mechanism is in electric leakage, an operator can directly contact with high voltage in the power supply loop, so that safety accidents are caused. On the other hand, when the switch mechanism is opened and closed, the high-voltage on-off is used for easily generating arc sparks, so that the risk of burning or igniting inflammable and explosive objects to a human body is generated.

It should be noted that the arc is generated at the contact point when the large voltage and the large current are on-off, and generally, if the circuit voltage is not lower than 10-20V and the current is not lower than 80-100mA, the arc will be generated between the contacts of the electrical appliance.

In order to solve the above problems, an embodiment of the present application provides a circuit of a power safety controller, which can control on/off of a high voltage power supply when a switch is under an ultra-low dc voltage or an ultra-low current, and does not generate an arc near the switch.

Referring to fig. 1, the circuit of the power safety controller includes a switching power supply circuit 1, a relay unit 2 and a switch control circuit 3, wherein an input end of the switching power supply circuit 1 is connected to an external ac power, one end of the switch control circuit 3 is connected to a negative output end of the switching power supply circuit 1, the other end is connected to a positive output end of the switching power supply circuit 1 through a control loop of the relay unit 2, one end of an output loop of the relay unit 2 is connected to a positive input end of the switching power supply, the other end is used for outputting a power supply voltage, the switch control circuit 3 is used for receiving a switching signal input by a user, and controlling current on or off of the control loop of the relay unit 2 after amplifying based on the switching signal.

In the above embodiment, after the external ac (mains supply or self-generating power) is connected, the switching power supply circuit 1 converts the connected larger ac voltage into a low-voltage dc voltage, that is, into the working voltage of the control loop of the relay unit 2. In addition, by connecting the switch control circuit 3 in series to a circuit constituted by the output terminal of the switching power supply circuit 1 and the control circuit of the relay unit 2, the on/off of the control circuit of the relay unit 2 can be controlled by the switch control circuit 3, and the on/off of the output circuit of the relay unit 2 (i.e., the on/off of the power supply voltage output by the relay unit 2) can be controlled. Wherein the switch control circuit 3 is configured to receive a switch signal input by a user, that is, a switch mechanism may be provided in the switch control circuit 3, and then an operator inputs switch information into the switch control circuit 3 by operating the switch mechanism. Then, the switching control circuit 3 amplifies the low current signal corresponding to the switching information, and then controls the current on or off of the control circuit of the relay unit 2. In other words, the switching control circuit 3 is connected in series in a loop formed by the output terminal of the switching power supply circuit 1 and the control loop of the relay unit 2, but the switching mechanism for receiving the switching signal of the operator in the switching control circuit 3 is not directly connected in series in the loop but is connected in a branch having a lower current level, but the switching of the switching mechanism causes the switching control circuit 3 to be turned on or off as a whole. Therefore, the voltage level of the control loop of the relay unit 2 is lower, and then the voltage level of the two ends of the switching mechanism can be further reduced through the switch control circuit 3, so that the safety of the switching mechanism is further improved. Therefore, even if the electric leakage occurs at the position of the switch mechanism, electric shock injury to human body is not caused, and because the voltage level is low, larger electric arc is not caused, and flammable and explosive objects are ignited.

For example, referring to fig. 3, if the switch control circuit 3 is designed based on a triode, the loop where the emitter and collector of the triode are located will be connected in series in the loop formed by the output terminal of the switch power supply circuit 1 and the control loop of the relay unit 2, and the switching mechanism in the switch control circuit 3 is connected in series in the loop where the base and collector of the triode are located. Of course, the triode herein is only an example, and in the actual design implementation process, other electronic switching transistors such as MOS transistors and thyristors may be used for design.

The relay unit 2 may be a normally closed relay or a normally open relay. When the switch control circuit 3 is a normally closed relay, the output loop continuously outputs the power supply voltage under the normal condition, and after a switch signal is switched on in response to the operation of an operator, the switch control circuit is used for amplifying the switch signal and then controlling the control loop of the normally closed relay to be on, so that the output loop of the normally closed relay is disconnected, and the output power supply voltage is disconnected. On the contrary, when the normally open relay is used, the output loop does not output the power supply voltage under the normal condition, and after the switch control circuit 3 responds to the operation of an operator and turns on a switch signal, the switch signal is amplified and then the control loop of the normally closed relay is controlled to be conducted, so that the output loop of the normally closed relay is conducted, and the output power supply voltage is conducted.

Referring to fig. 2, in some embodiments of the present application, a temperature protection circuit 4 is further included. An input end of the temperature protection circuit 4 is connected with an anode output end of the switching power supply circuit 1, and an output end of the temperature protection circuit 4 is connected with the switching control circuit 3 through a control loop of the relay unit 2.

In the above embodiment, by connecting the temperature protection circuit 4 in series between the output terminal of the switching power supply circuit 1 and the control loop of the relay unit 2, the devices in the circuit can be protected from damage by overheat. The temperature protection circuit 4 may be designed based on the characteristics of a thermistor, and when the temperature in the circuit exceeds a certain threshold value, the resistance value of the thermistor changes, so that the operation of the temperature protection circuit 4 is triggered, the circuit is cut off, and the electronic components in the circuit are protected. The burning loss of the circuit of the power supply safety controller caused by overheat and other safety accidents (such as ignition or electric shock injury to operators when the temperature is too high due to overcurrent) caused by overheat can be avoided.

Referring to fig. 3, in some embodiments of the present application, the switching power supply circuit 1 is a switching power supply module, the relay unit 2 includes a solid state relay J1, and the switching control circuit 3 includes a transistor Q1, a diode D2, a diode D3, a switch S1 and a fuse F1.

The input end of the switch power supply module is connected with external alternating current, one end of an output loop of the solid state relay J1 is connected with the positive electrode input end of the switch power supply module, the other end of the output loop is used for outputting power supply voltage, an emitter of the triode Q1 is connected with the positive electrode output end of the switch power supply module through a control loop of the solid state relay J1, a collector of the triode Q1 is connected with the negative electrode output end of the switch power supply module, a base of the triode Q1 is connected with a cathode of the diode D1, an anode of the diode D1 is connected with a collector of the triode Q1, an anode of the diode D2 is connected with an anode of the diode D1, a cathode of the diode D2 is connected with a cathode of the diode D1, an anode of the diode D3 is connected with an anode of the diode D2 through the fuse F1, and the switch S1 is connected with the diode D3 in parallel.

The main function of the switching power supply module is that high energy can be cut into countless low energy and then transmitted to the upper surface of the output end, and the output end can also feed back the input end through the height of the output voltage, so that the effect of stabilizing the output voltage can be achieved. In addition, the heat generation amount of the switching power supply module is relatively low, so that the excessive energy can be converted into heat to be emitted, the voltage can be reduced, and the efficiency of the switching power supply module is relatively high. In short, the switch power supply module has the advantages of smaller volume and light weight, and is very convenient to use because the switch power supply does not have a transformer.

In addition, solid state relays have no moving parts, and typically employ specially configured MOSFETs and BJTs to provide power switching. Due to its lack of moving parts, both wear is reduced and a higher switching speed is provided.

For the convenience of understanding, it is assumed that the external ac power is 220V ac power, the power supply voltage OUT1 output by the corresponding solid state relay J1 is also 220V ac power, and the switching power supply module is a 12V switching power supply module. The switching power supply module will be able to rectify and stabilize the incoming 220V ac to 12V dc, that is, the 12V dc will be the operating voltage of the control loop of the solid state relay J1. Then, the triode Q1 is connected in series in a loop formed by the output end of the switching power supply module and the control loop of the solid-state relay J1, so that when the triode Q1 is conducted, the loop is conducted, and the control loop of the solid-state relay J1 acts. Conversely, when transistor Q1 is turned off, the circuit will be opened, and the control circuit of solid state relay J1 will be opened accordingly. And the switch S1 connected in parallel between the base and collector ends of the triode can be used as a device for controlling the on or off of the triode Q1. The current amplification principle of the triode is as follows: assuming that the amplification factor of the transistor Q1 is i1=i2, where I1 is a current value flowing from the emitter to the collector of the transistor Q1, and I2 is a current value flowing from the emitter to the base of the transistor Q1. Thus, the value of the current flowing through the switch S1 will be less than the operating voltage of the control loop of the solid state relay J1, and particularly much less affected by the amplification factor of the transistor Q1. Therefore, contacts at two ends of the switch S1 are on a circuit with ultralow voltage and current, and can be used for controlling the on and off of the triode Q1, so as to control the on and off of a control circuit of the solid state relay J1, namely the on and off of an output circuit of the solid state relay J1, and realize the on and off of the output voltage OUT 1. In addition, two diodes (diode D1 and diode D2) are connected in parallel to the base and collector of the triode Q1, and diode D3 and fuse F1 are connected in parallel (diode D3 and fuse F1 are connected in series and then connected in parallel to the base and collector of the triode Q1), so that damage to the triode Q1 due to sudden increase of voltage and current can be avoided, and control over the solid state relay J1 is lost.

It should be noted that, since the contacts at two ends of the switch S1 are on a circuit with ultra-low voltage and current, even if the switch S1 is placed in a water source, the switch S1 will not cause electric shock injury to a human body when touched by hand, the switch S1 will not be naturally turned on in water, the circuit is formed (the water has a conductive function, but the switch S1 at the control end is an ultra-low voltage and ultra-low current, so that the switch S1 will not be turned on in water), and arc spark will not be generated due to the opening and closing of the switch S1, so that the safety of the circuit can be ensured.

Illustratively, the model of transistor Q1 may be s8550, the models of diode D1 and diode D2 may be IN4742, and the model of diode D3 may be IN4007.

In the above embodiment, one supply voltage is output, and in a practical application scenario, multiple supply voltages are generally required to be output. Of course, a plurality of circuits of the power supply safety controller can be directly arranged, so that the requirements of outputting multiple paths of power supply voltages and carrying out safety control are met. But this would result in some wastage of components. Therefore, in some embodiments of the present application, by setting the relay unit 2 as a plurality of relays and then setting the switch control circuits 3 in one-to-one correspondence to control on and off of the control loops of the relays, it is possible to output multiple power supply voltages and realize the requirement of safety control. Each path of switch control circuit 3 is respectively connected into a loop formed by the output end of the switch power supply module and the control loop of the relay unit 2, so that the number of components can be saved to a certain extent.

Specifically, for ease of understanding, when the circuit configuration shown in fig. 3 is assumed to be adopted when the circuit employing the power supply safety controller is implemented, and two power supply voltages need to be output, and safety control is performed thereon, a specific circuit design will be as shown in fig. 4. That is, referring to fig. 4, in some embodiments of the present application, the relay unit 2 further includes a solid state relay J2, and the switch control circuit 3 further includes a transistor Q2, a diode D4, a diode D5, a diode D6, a switch S2, and a fuse F2.

One end of the output loop of the solid state relay J2 is connected to the positive input end of the switching power supply module, the other end is used for outputting another path of supply voltage, the emitter of the triode Q2 is connected to the positive output end of the switching power supply module through the control loop of the solid state relay J2, the collector of the triode Q2 is connected to the negative output end of the switching power supply module, the base of the triode Q2 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the collector of the triode Q2, the anode of the diode D5 is connected to the anode of the diode D4, the cathode of the diode D5 is connected to the cathode of the diode D4, the anode of the diode D6 is connected to the anode of the diode D5, and the cathode of the diode D6 is connected to the cathode of the diode D5 through the fuse F2, and the switch S1 is connected in parallel to the diode D6.

In the above embodiment corresponding to fig. 4, the principle is basically the same as that of the implementation mode corresponding to fig. 3, but one solid-state relay J2 is further provided, and another switch control circuit 3 is formed by the triode Q2, the diode D4, the diode D5, the diode D6, the switch S2 and the fuse F2, so that the safe control output of the two power supply voltages is realized. Of course, more solid state relays and a corresponding switch control circuit 3 may be set according to actual situation requirements, so as to realize safe control output of more paths of supply voltages. Similarly, transistor Q2 may be of the type s8550, diode D4 and diode D5 may be of the type IN4742, and diode D6 may be of the type IN4007.

Referring to fig. 5, in some embodiments of the present application, the switching power supply circuit 1 is a switching power supply module, the relay unit 2 includes an electromechanical relay J3, and the switching control circuit 3 includes a transistor Q3, a diode D1, a diode D2, a diode D3, a switch S1, a fuse F1, and a diode D7.

The input end of the switching power supply module is connected with external alternating current, one end of an output loop of the electromechanical relay J3 is connected with the positive electrode input end of the switching power supply module, the other end of the output loop is used for outputting power supply voltage, an emitter of the triode Q3 is connected with an anode of the diode D7, a cathode of the diode D7 is connected with the positive electrode input end of the switching power supply module, an emitter of the triode Q3 is connected with the positive electrode output end of the switching power supply module through a control loop of the electromechanical relay J3, a collector of the triode Q3 is connected with a negative electrode output end of the switching power supply module, a base of the triode Q3 is connected with a cathode of the diode D1, an anode of the diode D1 is connected with a collector of the triode Q3, an anode of the diode D2 is connected with an anode of the diode D1, a cathode of the diode D2 is connected with a cathode of the diode D1, an anode of the diode D3 is connected with the diode F1 in parallel through the diode F1.

In the above embodiment, the solid state relay J1 is replaced with the electromechanical relay J3, as compared with the embodiment corresponding to fig. 3. Among them, electromechanical relays, also commonly referred to as mechanical relays, have contacts that are connected together in the presence of an electromagnetic field. The magnetic field that connects the two contacts together comes from a small electromagnetic coil that is turned on and off by an external circuit. Electromechanical relays generally have lower resistance than solid state relays, and thus can control higher power devices (in particular, their size versus power control ratio is better). In addition, electromechanical relays are also much cheaper than solid state relays, so to speak easier to drive. In summary, by replacing the status relay J1 with the electromechanical relay J3, a higher level of voltage can be controlled (the output power supply voltage level can be higher), and the cost is lower.

Similarly to the embodiments corresponding to fig. 3-4, in a practical application scenario, in order to output multiple supply voltages, multiple electromechanical relays and one-to-one switch control circuits 3 may be utilized to output and control multiple supply voltages based on the embodiment of fig. 5.

For easy understanding, when the configuration shown in fig. 5 is adopted in the implementation, and two paths of supply voltages need to be output and controlled safely, the specific circuit design can be as shown in fig. 6. That is, referring to fig. 6, in some embodiments of the present application, the relay unit 2 further includes an electromechanical relay J4, and the switch control circuit 3 further includes a transistor Q4, a diode D5, a diode D6, a switch S2, a fuse F2, and a diode D8. One end of the output loop of the electromechanical relay J4 is connected to the positive input end of the switching power supply module, the other end is used for outputting another path of supply voltage, the emitter of the triode Q4 is connected to the positive output end of the switching power supply module through the control loop of the electromechanical relay J4, the emitter of the triode Q4 is connected to the anode of the diode D8, the cathode of the diode D8 is connected to the positive input end of the switching power supply module, the collector of the triode Q4 is connected to the negative output end of the switching power supply module, the base of the triode Q4 is connected to the cathode of the diode D4, the anode of the diode D4 is connected to the collector of the triode Q4, the anode of the diode D5 is connected to the anode of the diode D4, the cathode of the diode D5 is connected to the cathode of the diode D4, the anode of the diode D6 is connected to the anode of the diode D5, and the cathode of the diode D6 is connected to the diode D1 through the fuse F2. In the implementation corresponding to fig. 6, the specific principle is similar to that of the implementation corresponding to fig. 5, and will not be repeated here.

Referring to fig. 3-6, in some embodiments of the present application, a temperature protector RT1 is further included, and the temperature protector RT1 is connected in series to the positive output terminal of the switching power module. That is, by configuring one temperature protector RT1 in the circuit, when the temperature exceeds the limiting point of the component, the power-off process can be performed to ensure the safety of the electric appliances accessed from the front and rear sides of the temperature protector RT 1.

Referring to fig. 3-6, in some embodiments of the present application, the switching power module further includes a resistor R1, wherein the resistor R1 is connected in series with the positive output terminal of the switching power module. That is, in order to ensure the stability of the output dc voltage, a resistor R1 is added to the circuit to limit the current, thereby avoiding the damage of the subsequent circuit caused by the overcurrent.

The embodiment of the application also provides a device of the power supply safety controller, which comprises a shell and a circuit board provided with the circuit of the power supply safety controller, wherein the circuit board is arranged in the shell. The circuit board provided with the circuit of the power supply safety controller is packaged into the shell (for example, the circuit board can be poured into the shell), so that the device of the power supply safety controller is manufactured, and the device is beneficial to users to use and is convenient and quick.

It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (9)

1. The circuit of the power supply safety controller is characterized by comprising a switching power supply circuit, a relay unit and a switch control circuit, wherein the input end of the switching power supply circuit is used for being connected with external alternating current, one end of the switch control circuit is connected with the negative electrode output end of the switching power supply circuit, the other end of the switch control circuit is connected with the positive electrode output end of the switching power supply circuit through a control loop of the relay unit, one end of an output loop of the relay unit is connected with the positive electrode input end of the switching power supply, the other end of the output loop of the relay unit is used for outputting power supply voltage, and the switch control circuit is used for receiving a switching signal input by a user and controlling the current of the control loop of the relay unit to be conducted or cut off after amplification processing is carried out based on the switching signal.

2. The circuit of a power safety controller of claim 1, further comprising a temperature protection circuit;

the input end of the temperature protection circuit is connected with the positive electrode output end of the switching power supply circuit, and the output end of the temperature protection circuit is connected with the switching control circuit through the control loop of the relay unit.

3. The circuit of a power safety controller according to claim 1, wherein the switching power supply circuit is a switching power supply module, the relay unit includes a solid state relay J1, and the switching control circuit includes a transistor Q1, a diode D2, a diode D3, a switch S1, and a fuse F1;

the input end of the switch power supply module is used for being connected with external alternating current, one end of an output loop of the solid-state relay J1 is connected with an anode input end of the switch power supply module, the other end of the output loop of the solid-state relay J1 is used for outputting power supply voltage, an emitting electrode of the triode Q1 is connected with an anode output end of the switch power supply module through a control loop of the solid-state relay J1, a collecting electrode of the triode Q1 is connected with a cathode of the diode D1, an anode of the diode D1 is connected with a collecting electrode of the triode Q1, an anode of the diode D2 is connected with an anode of the diode D1, a cathode of the diode D2 is connected with a cathode of the diode D1, a cathode of the diode D3 is connected with an anode of the diode D2 through a fuse F1, and the switch S1 is connected with the cathode of the diode D2 in parallel.

4. A circuit of a power safety controller according to claim 3, wherein the relay unit further comprises a solid state relay J2, and the switch control circuit further comprises a transistor Q2, a diode D4, a diode D5, a diode D6, a switch S2, and a fuse F2;

the output loop one end of the solid state relay J2 is connected with the positive electrode input end of the switch power supply module, the other end of the solid state relay J2 is used for outputting another path of power supply voltage, the emitter of the triode Q2 is connected with the positive electrode output end of the switch power supply module through the control loop of the solid state relay J2, the collector of the triode Q2 is connected with the negative electrode output end of the switch power supply module, the base of the triode Q2 is connected with the cathode of the diode D4, the anode of the diode D4 is connected with the collector of the triode Q2, the anode of the diode D5 is connected with the anode of the diode D4, the cathode of the diode D5 is connected with the cathode of the diode D4, the anode of the diode D6 is connected with the anode of the diode D5 through the fuse F2, and the switch S1 is connected with the diode D6 in parallel.

5. The circuit of a power safety controller according to claim 1, wherein the switching power supply circuit is a switching power supply module, the relay unit includes an electromechanical relay J3, the switching control circuit includes a transistor Q3, a diode D1, a diode D2, a diode D3, a switch S1, and a fuse F1, and further includes a diode D7;

the input end of the switching power supply module is used for being connected with external alternating current, one end of an output loop of the electromechanical relay J3 is connected with an anode input end of the switching power supply module, the other end of the output loop of the electromechanical relay J3 is used for outputting power supply voltage, an emitting electrode of the triode Q3 is connected with an anode of the diode D7, a cathode of the diode D7 is connected with an anode input end of the switching power supply module, an emitting electrode of the triode Q3 is connected with an anode output end of the switching power supply module through a control loop of the electromechanical relay J3, a collector of the triode Q3 is connected with a cathode of the switching power supply module, a base electrode of the triode Q3 is connected with a collector of the diode D1, an anode of the diode D1 is connected with an anode of the diode D1, a cathode of the diode D2 is connected with a cathode of the diode D1, an anode of the diode D3 is connected with an anode of the diode D2 through a cathode of the diode D1, and the cathode of the diode D1 is connected with the diode D1 in parallel.

6. The circuit of claim 5, wherein the relay unit further comprises an electromechanical relay J4, and the switch control circuit further comprises a transistor Q4, a diode D5, a diode D6, a switch S2, and a fuse F2, and further comprises a diode D8;

the output loop one end of the electromechanical relay J4 is connected with the positive electrode input end of the switching power supply module, the other end of the output loop is used for outputting another path of power supply voltage, the emitter of the triode Q4 is connected with the positive electrode output end of the switching power supply module through the control loop of the electromechanical relay J4, the emitter of the triode Q4 is connected with the anode of the diode D8, the cathode of the diode D8 is connected with the positive electrode input end of the switching power supply module, the collector of the triode Q4 is connected with the negative electrode output end of the switching power supply module, the base of the triode Q4 is connected with the cathode of the diode D4, the anode of the diode D4 is connected with the collector of the triode Q4, the anode of the diode D5 is connected with the anode of the diode D4, the cathode of the diode D5 is connected with the cathode of the diode D4, the anode of the diode D6 is connected with the anode of the diode D5 through the fuse F2 and the diode D6 is connected with the diode D1 in parallel.

7. A circuit of a power safety controller according to claim 3 or 5, further comprising a temperature protector RT1, wherein the temperature protector RT1 is connected in series to the positive output of the switching power module.

8. A circuit of a power safety controller according to claim 3 or 5, further comprising a resistor R1, the resistor R1 being connected in series with the positive output of the switching power supply module.

9. A device for a power safety controller, comprising a housing and a circuit board provided with a circuit for a power safety controller according to any one of claims 1 to 8, said circuit board being provided in said housing.