CN219873315U - Circuit and device of power supply safety controller - Google Patents

Abstract

The utility model 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 transformer unit, a rectifier bridge circuit, a voltage stabilizing circuit and a switch control circuit which are sequentially connected in series, and further comprises a relay unit, wherein the input end of the transformer unit is used for being connected with external alternating current, one end of an output loop of the relay unit is connected with the input end of the transformer unit, the other end of the output loop of the relay unit is used for outputting power supply voltage, one end of a control loop of the relay unit is connected with the output end of the voltage stabilizing circuit, the other end of the control loop of the relay unit is connected with the switch control circuit, 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 based on the switching signal. By adopting the technical scheme of the utility model, the normal output or disconnection of the control power supply can be carried out under the state that the switch is in ultra-low direct-current voltage and ultra-low current, and the safety of operating personnel for operating the switch is improved.

Description

Circuit and device of power supply safety controller

Technical Field

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

Background

In daily life, the switch of household lamps and lanterns and other electrical appliances is directly connected on 220V voltage. If the switch is abnormal, an operator may directly contact 220V voltage, thereby causing a safety hazard. For example, when the hands of the operators carry moisture, the operators may get an electric shock due to the conduction effect of the moisture.

In the prior art, in order to avoid misoperation of operators, the electric shock is processed by improving the insulativity of an operating mechanism of a switch, so that operators cannot directly contact with higher power supply voltage (such as mains supply) when quality problems (electric leakage of the switch) occur on the switch or moisture exists on hands of the operators. However, if the voltage level is high, the cost of the insulation treatment will be high, and the electric shock hidden trouble may still be easily caused because insulation is not made or the insulation performance is reduced. That is, how to simply and conveniently improve the safety of the switching control of the power supply is a problem to be solved.

Disclosure of Invention

In order to solve the above problems, the present utility model provides a circuit and a device for a power safety controller, which can control the normal output or disconnection of a power supply when a switch is in an ultralow direct-current voltage and ultralow current state, and improve the safety of operating personnel operating the switch.

The utility model is realized in the following way:

in a first aspect, the present utility model provides a circuit of a power safety controller, which includes a transformer unit, a rectifier bridge circuit, a voltage stabilizing circuit, and a switch control circuit connected in series in this order, and further includes a relay unit, wherein an input end of the transformer unit is connected to an external ac power, one end of an output loop of the relay unit is connected to an input end of the transformer unit, the other end of the output loop of the relay unit is used for outputting a power supply voltage, one end of a control loop of the relay unit is connected to an output end of the voltage stabilizing circuit, the other end of the control loop of the relay unit is connected to the switch control circuit, and the switch control circuit 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 based on the switching signal.

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 output end of the voltage stabilizing circuit, and the output end of the temperature protection circuit is connected with the switch control circuit through the control loop of the relay unit; or; the input end of the temperature protection circuit is connected with the output end of the rectifier bridge, and the output end of the temperature protection circuit is connected with the input end of the voltage stabilizing circuit.

Further, based on the foregoing, the transformer unit includes a transformer T1, the rectifier bridge circuit includes a rectifier bridge BD1 and a capacitor C1, the voltage stabilizing circuit includes a voltage stabilizing tube U1 and a resistor R1, the relay unit includes a solid state relay J1, and the switch control circuit includes a transistor Q1, a diode D2, a diode D3, a switch S1 and a fuse F1; the input end of the transformer T1 is connected with external alternating current, one end of an output loop of the solid state relay J1 is connected with the input end of the transformer T1, the other end of the output loop is used for outputting power supply voltage, the output end of the transformer T1 is connected with the input end of the rectifier bridge BD1, the output end of the rectifier bridge BD1 is connected with the capacitor C1 in parallel, a pin Vin of the voltage regulator U1 is connected with the positive output end of the rectifier bridge BD1, a pin GND of the voltage regulator U1 is connected with the negative output end of the rectifier bridge BD1, one end of the resistor R1 is connected with a pin Vout of the voltage regulator U1, and the other end of the resistor R1 is connected with an emitter of the triode Q1 through a control loop of the solid state relay J1; the collector of the triode Q1 is connected with the negative electrode output end of the rectifier bridge BD1, the base of the triode Q1 is connected with the cathode of the diode D1, the anode of the diode D1 is connected with the collector of the triode Q1, the anode of the diode D2 is connected with the anode of the diode D1, the cathode of the diode D2 is connected with the cathode of the diode D1, the anode of the diode D3 is connected with the anode of the diode D2, the cathode of the diode D3 is connected with the cathode 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 input end of the transformer T1, the other end is used for outputting another supply voltage, the emitter of the triode Q2 is connected to the resistor R1 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 rectifier bridge BD1, 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, 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 transformer unit includes a transformer T1, the rectifier bridge circuit includes a rectifier bridge BD1 and a capacitor C1, the voltage stabilizing circuit includes a voltage stabilizing tube U1 and a resistor R1, the relay unit includes an electromechanical relay J3, and the switch control circuit includes a triode 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 transformer T1 is connected to external ac, one end of the output loop of the electromechanical relay J3 is connected to the input end of the transformer T1, the other end is used to output a supply voltage, the output end of the transformer T1 is connected to the input end of the rectifier bridge BD1, the output end of the rectifier bridge BD1 is connected in parallel to the capacitor C1, the pin Vin of the voltage regulator U1 is connected to the positive output end of the rectifier bridge BD1, the pin GND of the voltage regulator U1 is connected to the negative output end of the rectifier bridge BD1, one end of the resistor R1 is connected to the pin Vout of the voltage regulator U1, the other end is connected to the emitter of the triode Q3 through the control loop of the electromechanical relay J3, the emitter of the triode Q3 is connected to the anode of the diode D7, and the cathode of the diode D7 is connected to the resistor R1;

the collector of the triode Q3 is connected with the negative electrode output end of the rectifier bridge BD1, the base of the triode Q3 is connected with the cathode of the diode D1, the anode of the diode D1 is connected with the collector of the triode Q3, the anode of the diode D2 is connected with the anode of the diode D1, the cathode of the diode D2 is connected with the cathode of the diode D1, the anode of the diode D3 is connected with the anode of the diode D2, the cathode of the diode D3 is connected with the cathode 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 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;

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 resistor R1, one end of the output loop of the electromechanical relay J4 is connected to the input end of the transformer T1, the other end is used for outputting another supply voltage, the emitter of the triode Q4 is connected to the resistor R1 through the control loop of the electromechanical relay J4, the collector of the triode Q4 is connected to the negative output end of the rectifier bridge BD1, 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 parallel.

Further, based on the foregoing, the temperature protector RT1 is further included; the temperature protector RT1 is connected in series between the resistor R1 and the pin Vout of the regulator U1; or; the temperature protector RT1 is connected in series between the rectifier bridge BD1 and the pin Vin of the regulator U1.

In a second aspect, the present utility model provides a device for a power safety controller, comprising a housing and a circuit board provided with circuitry for any one of the power safety controllers of the first aspect, the circuit board being provided within the housing.

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

through optimizing circuit structure, can make switch in the state of ultralow direct voltage, ultralow electric current carry out the normal output or disconnection of control power, promote the security of operating personnel operation switch. In addition, before the power switch is not opened, no voltage or current exists in the whole circuit, so that the safety is ensured. The fire disaster caused by spontaneous combustion of wires and cables which are lost and repaired all the time in a plurality of old houses and old workshops is avoided. In addition, when the power switch and the power socket of the power safety controller are connected, and heavy rain and flood tide occur, even if the power switch and the power socket are completely soaked in large water, large-area electric shock accidents can not occur.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, 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 utility model 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 an embodiment of a power safety controller according to the present utility model;

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

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

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

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

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

Icon: 1. a transformer unit; 2. a rectifier bridge circuit; 3. a voltage stabilizing circuit; 4. a switch control circuit; 5. a relay unit; 6. a temperature protection circuit.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model 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 utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Examples

Some embodiments of the present utility model 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.

For the switching mechanism, the operator may be at risk of electric shock due to the switch being wet or the switch leaking electricity. The problem of electric leakage is solved by improving the insulativity of the switch equipment, however, the insulativity of the switch equipment is reduced under long-time operation, and the risk of electric shock of personnel is still easy to cause.

In order to cope with the above problems, the embodiment of the utility model provides a circuit of a power supply safety controller, which can control the normal output or disconnection of a power supply under the state that a switch is in ultra-low direct-current voltage and ultra-low current, and can always ensure the safety of operating the switch by an operator.

Referring to fig. 1, the circuit of the power safety controller includes a transformer unit 1, a rectifier bridge circuit 2, a voltage stabilizing circuit 3 and a switch control circuit 4 connected in series in sequence, and further includes a relay unit 5, wherein an input end of the transformer unit 1 is connected to an external ac power, one end of an output loop of the relay unit 5 is connected to the input end of the transformer unit 1, the other end is used for outputting a power supply voltage, one end of a control loop of the relay unit 5 is connected to an output end of the voltage stabilizing circuit 3, the other end is connected to the switch control circuit 4, and the switch control circuit 4 is used for receiving a switching signal input by a user and controlling current on or off of a control loop of the relay unit 5 based on the switching signal.

In the above embodiment, after the external ac (mains supply or self-generating power) is connected, the transformer unit 1 steps down and limits the current of the ac with larger voltage that can be connected, and then supplies the ac to the rectifier bridge circuit 2 to rectify the ac into smaller dc voltage, and then the dc voltage output by the rectifier bridge circuit 2 is further stabilized in the corresponding interval by the voltage stabilizing circuit 3, that is, when the connected external ac fluctuates or the load connected at the subsequent stage changes, the stable and effective voltage can still be output. The voltage output from the voltage stabilizing circuit 3 is used to provide an operating voltage to the control loop of the relay unit 5. One end of the output loop of the relay unit 5 is directly connected to a fire wire of external alternating current, and then the other end of the output loop can be used for outputting a power supply voltage (OUT in fig. 1) for connecting to a load for working. In addition, the switch control circuit 4 is configured to receive a switching signal input by a user (i.e., a signal generated by the user controlling the opening or closing of a physical switch in the switch control circuit 4), and then control the switching on or off of the voltage stabilizing circuit 3 according to the switching signal, so as to implement the on or off of the control loop of the control relay unit 5, that is, the current on or off of the control loop that can control the relay unit 5.

The physical switch in the switch control circuit 4 is not directly connected in series to the loop constituted by the control loop of the voltage stabilizing circuit 3 and the relay unit 5. The switch control circuit 4 is provided with an electronic switch tube, and when the electronic switch tube is turned on, a loop formed by the voltage stabilizing circuit 3 and a control loop of the relay unit 5 is turned on, and otherwise, the loop is turned off. The physical switch is connected in series to the control loop of the valve switch of the switch control circuit 4, and when the physical switch is on, the valve switch will be turned on, whereas when the physical switch is off, the valve switch will be turned off. Since the voltage level of the control loop of the relay unit 5 is low (generally 5-12V), it becomes safer to switch the power on/off in the control loop. Further, based on the switch control circuit 4, the voltage level of the two ends of the physical switch can be lower, so that no influence is caused to an operator even when the physical switch is in the condition of electric leakage.

For example, referring to fig. 3, if the switch control circuit 4 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 control loop of the voltage stabilizing circuit 3 and the relay unit 5, and the physical switch in the switch control circuit 4 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.

It should be noted that, for the relay unit 5, it may be a normally closed relay so that it always outputs the power supply voltage in a normal case, and the power supply voltage is turned off after the switch control circuit 4 responds to the operator pressing the switch therein. Conversely, the relay unit 5 may be a normally open relay such that in a normal case, the power supply voltage is not outputted, and the power supply voltage will start to be outputted after the switch control circuit 4 responds to the operator pressing the switch therein.

In order to prevent the circuit of the power supply safety controller from causing the fault of components due to accidental heating in the use process, the potential safety hazard is caused. Therefore, referring to fig. 2, in some embodiments of the present utility model, a temperature protection circuit 6 is further included; an input end of the temperature protection circuit 6 is connected with an output end of the voltage stabilizing circuit 3, and an output end of the temperature protection circuit 6 is connected with the switch control circuit 4 through a control loop of the relay unit 5; or; the input end of the temperature protection circuit 6 is connected with the output end of the rectifier bridge, and the output end of the temperature protection circuit 6 is connected with the input end of the voltage stabilizing circuit 3.

By connecting the temperature protection circuit 6 in series to the circuit constituted by the voltage stabilizing circuit 3 and the control circuit of the relay unit 5, when the circuit generates heat exceeding a predetermined value when an overcurrent is caused by a short circuit or the like, the power-off process is performed to protect the front and rear electric appliances. Of course, the temperature protection circuit may be disposed between the rectifier bridge circuit 2 and the voltage stabilizing circuit 3, and the temperature protection function may be also provided.

Referring to fig. 3, in some embodiments of the present utility model, the transformer unit 1 includes a transformer T1, the rectifier bridge circuit 2 includes a rectifier bridge BD1 and a capacitor C1, the voltage stabilizing circuit 3 includes a voltage stabilizing tube U1 and a resistor R1, the relay unit 5 includes a solid state relay J1, and the switch control circuit 4 includes a transistor Q1, a diode D2, a diode D3, a switch S1 and a fuse F1. The input end of the transformer T1 is connected to an external ac, one end of the output loop of the solid state relay J1 is connected to the input end of the transformer T1, the other end is used to output a supply voltage, the output end of the transformer T1 is connected to the input end of the rectifier bridge BD1, the output end of the rectifier bridge BD1 is connected in parallel to the capacitor C1, the pin Vin of the voltage regulator U1 is connected to the positive output end of the rectifier bridge BD1, the pin GND of the voltage regulator U1 is connected to the negative output end of the rectifier bridge BD1, one end of the resistor R1 is connected to the pin Vout of the voltage regulator U1, and the other end is connected to the emitter of the triode Q1 through the control loop of the solid state relay J1. The collector of the triode Q1 is connected with the negative electrode output end of the rectifier bridge BD1, the base of the triode Q1 is connected with the cathode of the diode D1, the anode of the diode D1 is connected with the collector of the triode Q1, the anode of the diode D2 is connected with the anode of the diode D1, the cathode of the diode D2 is connected with the cathode of the diode D1, the anode of the diode D3 is connected with the anode of the diode D2, the cathode of the diode D3 is connected with the cathode of the diode D2 through the fuse F1, and the switch S1 is connected with the diode D3 in parallel.

In the above embodiments, the solid state relay has no moving parts, and typically employs 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 ease of understanding, it is assumed that the external ac power supplied is 220V ac power, and the power supply voltage OUT1 output by the solid state relay J1 is also 220V ac power. Thus, after the transformer T1 transforms the 220V ac power, a lower level voltage is outputted from the secondary winding of the transformer T1, and the transformation is assumed to be 5V. The rectifier bridge BD1 rectifies the 5V ac voltage to obtain a 5V dc voltage, and then filters the 5V dc voltage through the capacitor C1 to obtain a cleaner dc voltage. Then, the voltage regulator U1 is used for ensuring the stability of the output direct-current voltage. In addition, in order to ensure the stability of the output direct-current voltage, a resistor R1 is added to the circuit to limit the current, so that the damage of a later-stage circuit caused by overcurrent is avoided. And two diodes (diode D1 and diode D2) are connected in parallel on the base electrode and collector electrode of the power amplifier triode Q1, and the diode D3 and the fuse F1 are connected in parallel (after the diode D3 and the fuse F1 are connected in series, the diode D3 and the fuse F1 are connected in parallel on the base electrode and collector electrode of the triode Q1), so that the damage of the triode Q1 caused by the sudden increase of voltage and current can be avoided, and the control of the solid state relay J1 is lost. The contacts at two ends of the switch S1 are on an ultralow voltage and current loop, and can control the on and off of the triode Q1, so as to control the on and off of the control loop of the solid state relay J1, i.e. the on and off of the output loop of the solid state relay J1, thereby realizing the on and off control of the output voltage OUT 1.

Illustratively, the voltage regulator U1 may be 7808 IN model, the transistor Q1 may be s8550 IN model, the diode D1 and the diode D2 may be IN4742 IN model, and the diode D3 may be IN4007 IN model.

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 utility model, the relay unit 5 is configured as a plurality of relays, and then the switch control circuit 4 corresponding to one is further configured to control the on/off of the control loop of the relays, so as to realize the output of multiple power supply voltages and realize the requirement of safety control. Each switch control circuit 4 is respectively connected into a loop formed by the voltage stabilizing circuit 3 and a control loop of the relay unit 5, so that the number of components can be saved to a certain extent.

Specifically, for ease of understanding, when the configuration shown in fig. 3 is assumed to be adopted for a specific implementation, and two power supply voltages need to be output and safely controlled, a specific circuit design will be as shown in fig. 4. That is, referring to fig. 4, in some embodiments of the present utility model, the relay unit 5 further includes a solid state relay J2, and the switch control circuit 4 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 input end of the transformer T1, the other end is used for outputting another supply voltage, the emitter of the triode Q2 is connected to the resistor R1 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 rectifier bridge BD1, 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, 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.

The principle of the implementation corresponding to fig. 4 is basically the same as that of the implementation corresponding to fig. 3, and will not be described here again. 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 utility model, the transformer unit 1 includes a transformer T1, the rectifier bridge circuit 2 includes a rectifier bridge BD1 and a capacitor C1, the voltage stabilizing circuit 3 includes a voltage stabilizing tube U1 and a resistor R1, the relay unit 5 includes an electromechanical relay J3, and the switch control circuit 4 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 transformer T1 is connected to an external ac, one end of the output loop of the electromechanical relay J3 is connected to the input end of the transformer T1, the other end is connected to a supply voltage, the output end of the transformer T1 is connected to the input end of the rectifier bridge BD1, the output end of the rectifier bridge BD1 is connected in parallel to the capacitor C1, the pin Vin of the voltage regulator U1 is connected to the positive output end of the rectifier bridge BD1, the pin GND of the voltage regulator U1 is connected to the negative output end of the rectifier bridge BD1, one end of the resistor R1 is connected to the pin Vout of the voltage regulator U1, the other end is connected to the emitter of the triode Q3 through the control loop of the electromechanical relay J3, the emitter of the triode Q3 is connected to the anode of the diode D7, and the cathode of the diode D7 is connected to the resistor R1. The collector of the triode Q3 is connected with the negative electrode output end of the rectifier bridge BD1, the base of the triode Q3 is connected with the cathode of the diode D1, the anode of the diode D1 is connected with the collector of the triode Q3, the anode of the diode D2 is connected with the anode of the diode D1, the cathode of the diode D2 is connected with the cathode of the diode D1, the anode of the diode D3 is connected with the anode of the diode D2, the cathode of the diode D3 is connected with the cathode of the diode D2 through the fuse F1, and the switch S1 is connected with the diode D3 in parallel.

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 4 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 utility model, the relay unit 5 further includes an electromechanical relay J4, and the switch control circuit 4 further includes a transistor Q4, a diode D5, a diode D6, a switch S2, a fuse F2, and a diode D8. 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 resistor R1, one end of the output loop of the electromechanical relay J4 is connected to the input end of the transformer T1, the other end is used for outputting another supply voltage, the emitter of the triode Q4 is connected to the resistor R1 through the control loop of the electromechanical relay J4, the collector of the triode Q4 is connected to the negative output end of the rectifier bridge BD1, 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 parallel. 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 utility model, a temperature protector RT1 is further included; the temperature protector RT1 is connected in series between the resistor R1 and the pin Vout of the regulator U1; or; the temperature protector RT1 is connected in series between the rectifier bridge BD1 and the pin Vin of the regulator U1. By configuring the temperature protector RT1 in the circuit, the power-off processing can be performed when the temperature exceeds the limiting point of the components, so as to ensure the safety of electric appliances accessed from the front and rear ends of the temperature protector RT 1.

The embodiment of the utility model also provides a device of the power supply safety controller, which comprises a shell and a circuit board provided with the circuit of any 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 in the shell to form the device of the power supply safety controller, so that the device is beneficial to users to use, and is convenient and quick. For example, a circuit board provided with a circuit of any of the above-described power safety controllers may be subjected to a potting process (equivalent to a case obtained by potting), thereby obtaining a device of the power safety controller.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model 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 utility model 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 (8)

1. The circuit of the power supply safety controller is characterized by comprising a transformer unit, a rectifier bridge circuit, a voltage stabilizing circuit and a switch control circuit which are sequentially connected in series, and further comprising a relay unit, wherein the input end of the transformer unit is used for being connected with external alternating current, one end of an output loop of the relay unit is connected with the input end of the transformer unit, the other end of the output loop of the relay unit is used for outputting power supply voltage, one end of a control loop of the relay unit is connected with the output end of the voltage stabilizing circuit, the other end of the control loop of the relay unit is connected with the switch control circuit, and the switch control circuit is used for receiving a switch signal input by a user and controlling the current of the control loop of the relay unit to be conducted or cut off based on the switch 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 output end of the voltage stabilizing circuit, and the output end of the temperature protection circuit is connected with the switch control circuit through the control loop of the relay unit; or; the input end of the temperature protection circuit is connected with the output end of the rectifier bridge, and the output end of the temperature protection circuit is connected with the input end of the voltage stabilizing circuit.

3. The circuit of a power safety controller according to claim 1, wherein the transformer unit comprises a transformer T1, the rectifier bridge circuit comprises a rectifier bridge BD1 and a capacitor C1, the voltage stabilizing circuit comprises a voltage stabilizing tube U1 and a resistor R1, the relay unit comprises a solid state relay J1, and the switch control circuit comprises a triode Q1, a diode D2, a diode D3, a switch S1 and a fuse F1;

the input end of the transformer T1 is connected with external alternating current, one end of an output loop of the solid state relay J1 is connected with the input end of the transformer T1, the other end of the output loop is used for outputting power supply voltage, the output end of the transformer T1 is connected with the input end of the rectifier bridge BD1, the output end of the rectifier bridge BD1 is connected with the capacitor C1 in parallel, a pin Vin of the voltage regulator U1 is connected with the positive output end of the rectifier bridge BD1, a pin GND of the voltage regulator U1 is connected with the negative output end of the rectifier bridge BD1, one end of the resistor R1 is connected with a pin Vout of the voltage regulator U1, and the other end of the resistor R1 is connected with an emitter of the triode Q1 through a control loop of the solid state relay J1;

the collector of the triode Q1 is connected with the cathode output end of the rectifier bridge BD1, the base of the triode Q1 is connected with the cathode of the diode D1, the anode of the diode D1 is connected with the collector of the triode Q1, the anode of the diode D2 is connected with the anode of the diode D1, the cathode of the diode D2 is connected with the cathode of the diode D1, the anode of the diode D3 is connected with the anode of the diode D2, the cathode of the diode D3 is connected with the cathode of the diode D2 through the fuse F1, and the switch S1 is connected with the diode D3 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;

one end of the output loop of the solid-state relay J2 is connected with the input end of the transformer T1, the other end of the output loop is used for outputting another path of supply voltage, the emitter of the triode Q2 is connected with the resistor R1 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 rectifier bridge BD1, 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, the cathode of the diode D6 is connected with the cathode 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 transformer unit comprises a transformer T1, the rectifier bridge circuit comprises a rectifier bridge BD1 and a capacitor C1, the voltage stabilizing circuit comprises a voltage stabilizing tube U1 and a resistor R1, the relay unit comprises an electromechanical relay J3, the switch control circuit comprises a triode Q3, a diode D1, a diode D2, a diode D3, a switch S1 and a fuse F1, and further comprises a diode D7;

the input end of the transformer T1 is connected with external alternating current, one end of an output loop of the electromechanical relay J3 is connected with the input end of the transformer T1, the other end of the output loop of the electromechanical relay J3 is used for outputting power supply voltage, the output end of the transformer T1 is connected with the input end of the rectifier bridge BD1, the output end of the rectifier bridge BD1 is connected with the capacitor C1 in parallel, a pin Vin of the voltage regulator U1 is connected with the positive output end of the rectifier bridge BD1, a pin GND of the voltage regulator U1 is connected with the negative output end of the rectifier bridge BD1, one end of the resistor R1 is connected with a pin Vout of the voltage regulator U1, the other end of the resistor R1 is connected with an emitter of the triode Q3 through a control loop of the electromechanical relay J3, the emitter of the triode Q3 is connected with an anode of the diode D7, and a cathode of the diode D7 is connected with the resistor R1;

the collector of the triode Q3 is connected with the cathode output end of the rectifier bridge BD1, the base of the triode Q3 is connected with the cathode of the diode D1, the anode of the diode D1 is connected with the collector of the triode Q3, the anode of the diode D2 is connected with the anode of the diode D1, the cathode of the diode D2 is connected with the cathode of the diode D1, the anode of the diode D3 is connected with the anode of the diode D2, the cathode of the diode D3 is connected with the cathode of the diode D2 through the fuse F1, and the switch S1 is connected with the diode D3 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 emitter of the triode Q4 is connected with the anode of the diode D8, the cathode of the diode D8 is connected with the resistor R1, one end of an output loop of the electromechanical relay J4 is connected with the input end of the transformer T1, the other end of the output loop is used for outputting another power supply voltage, the emitter of the triode Q4 is connected with the resistor R1 through a control loop of the electromechanical relay J4, the collector of the triode Q4 is connected with the cathode output end of the rectifier bridge BD1, 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, the cathode of the diode D6 is connected with the cathode 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;

the temperature protector RT1 is connected in series between the resistor R1 and the pin Vout of the voltage stabilizing tube U1; or; the temperature protector RT1 is connected in series between the rectifier bridge BD1 and the pin Vin of the regulator U1.

8. 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 7, said circuit board being provided in said housing.