TWM450893U - Power supply protecting apparatus and power supply system - Google Patents

Abstract

A power supply protecting apparatus suitable for detecting abnormal state of a magnetic contactor which including an electromagnetic coil is provided. The magnetic contactor is turned on in response to the current through the electromagnetic coil, and outputs a three-phase working voltage to a load device accordingly. The power supply protecting apparatus includes a three-phase voltage detector and a power supply protecting circuit. The three-phase detector couples to the magnetic contactor, and uses for detecting the three-phase working voltage outputted from the magnetic contactor, wherein the power supply protecting circuit switch a corresponding circuit configuration according to the current through the electromagnetic coil and the detecting result of the three-phase voltage detector.

Description

Power supply protection device and power supply system

The present invention relates to a power protection device and a power supply system, and in particular to a power supply protection device and a power supply system suitable for detecting an abnormal state of an electromagnetic contactor.

The electromagnetic contactor is a device that turns on and turns on the circuit by the action of an electromagnet. Since it has the characteristics of being safe, convenient, and easy to be automatically controlled, the electromagnetic contactor is often used in the field of industrial wiring.

In a general electromagnetic contactor, the inside thereof basically includes an electromagnet, an electromagnetic coil, and a mechanism such as a return spring and a movable feeling. Specifically, when the user wants to turn on the electromagnetic contactor, the user can provide a rated voltage to the electromagnetic contactor and accordingly generate a current through the electromagnetic coil. The electromagnet inside the electromagnetic contactor generates a magnetic force in response to the current flowing through the electromagnetic coil, so that the contact of the originally open circuit inside the electromagnetic contactor induces a magnetic force to conduct.

However, since electromagnetic contactors must withstand considerable currents from time to time, they often cause some aging problems after long-term use, such as contact carbonization or spring fatigue. Under such circumstances, the load may be damaged due to the failure of the electromagnetic contactor to supply power or the excessive power supply due to the failure of the device itself, and even worse, may cause serious work safety accidents. For example, when the main contact of the electromagnetic contactor When stuck and stuck, the main circuit will continue to be powered without external control and cause the connected load to continue to operate. Taking the heater as a load as an example, when the electromagnetic contactor continues to supply power, the heater will continue to heat. If the liquid level of the heater is low, the heater will continue to dry and dry, causing overheating, melting, and even fire in the heating tank. And cause serious accidents such as fire. In addition, when the pump inside the heater is idling without water, it will cause the internal magnetic resistance to overheat and melt, which will damage the pump.

The present invention provides a power protection device and a power supply system that can detect an abnormal state of the electromagnetic contactor to prevent damage to the load device.

The present application proposes a power supply protection device adapted to detect an abnormal state of an electromagnetic contactor, wherein the electromagnetic contactor comprises an electromagnetic coil. The electromagnetic contactor is turned on in response to the current flowing through the electromagnetic coil, and accordingly outputs a three-phase operating voltage to the load device. The power protection device includes a three-phase voltage detector and a power protection circuit. The three-phase voltage detector is coupled to the electromagnetic contactor for detecting the three-phase operating voltage output by the electromagnetic contactor. The power supply protection circuit is coupled to the electromagnetic contactor and the three-phase voltage detector, wherein the power supply protection circuit is switched to the corresponding circuit configuration according to the current flowing through the electromagnetic coil and the detection result of the three-phase voltage detector.

In an embodiment of the present invention, the three-phase voltage detector includes a common contact, a normally open contact, and a normally closed contact. The common contact and the normally open contact form a first detection switch, and the common contact and the normally closed contact form a second detection switch. Wherein, when the three-phase voltage detector detects the three-phase work output by the electromagnetic contactor When the voltage is normal, the three-phase voltage detector turns on the first detecting switch, and when the three-phase voltage detecting device detects that the three-phase working voltage output by the electromagnetic contactor is abnormal, the three-phase voltage detecting device is turned on. Two detection switches.

In an embodiment of the present invention, the power protection device further includes a circuit breaker. The circuit breaker is coupled between the three-phase power source and the electromagnetic contactor, and is controlled by the power supply protection circuit to determine whether to disconnect the electromagnetic contactor from the three-phase power supply.

In an embodiment of the present invention, the power protection circuit includes a system voltage, a first coil, a first relay switch, a second relay switch, a third relay switch, a second coil, a fourth relay switch, a fifth relay switch, and a third The coil, the sixth relay switch, the fourth coil, and the seventh relay switch. The system voltage is coupled to the first detection switch and the first end of the second detection switch. The first coil is coupled to the electromagnetic contactor and is excited in response to the current of the electromagnetic coil. The first end of the first relay switch is coupled to the second end of the first detecting switch, wherein the first relay switch is turned on in response to the first coil of the exciting. The first end of the second relay switch is coupled to the second end of the second detecting switch, wherein the second relay switch is turned on in response to the first coil of the exciting. The first end of the third relay switch is coupled to the second end of the first detecting switch, wherein the third relay switch is turned on in response to the unexcited first coil. The second coil is coupled between the second end of the first relay switch and the ground voltage, and is excited by the current flowing through. The first end of the fourth relay switch is coupled to the first end of the first detecting switch, and the second end is coupled to the second end of the first detecting switch, wherein the fourth relay switch is turned on in response to the second coil of the exciting . The first end of the fifth relay switch is coupled to the second end of the second detecting switch, wherein the fifth relay switch is turned on in response to the second coil of the exciting. Third coil coupling Between the second end of the fifth relay switch and the ground voltage, it is excited by the current flowing through. The first end of the sixth relay switch is coupled to the circuit breaker, and the second end thereof is coupled to the resistor, wherein the sixth relay switch is turned on in response to the third coil of the excitation. The fourth coil is coupled between the second end of the second relay switch and the third relay switch and the ground voltage, wherein the fourth coil reacts with the current flowing through and is excited after a preset time. The first end of the seventh relay switch is coupled to the circuit breaker, and the second end of the seventh relay switch is coupled to the resistor, wherein the seventh relay switch is turned on in response to the fourth coil of the excitation.

In an embodiment of the present invention, the power protection circuit further includes a first prompt module, a second prompt module, and a third prompt module. The first prompting module is coupled to the second coil, wherein the first prompting module issues a prompt when the second coil is excited. The second prompting module is coupled to the third coil, wherein the second prompting module issues a prompt when the third coil is excited. The third prompt module is coupled to the second end of the second relay switch and the third relay switch, wherein the third prompting module issues a prompt when one of the second relay switch and the third relay switch is turned on.

In an embodiment of the present invention, the power protection circuit further includes an eighth relay switch, a ninth relay switch, and a buzzer. The first end of the eighth relay switch is coupled to the system voltage, wherein the eighth relay switch is turned on in response to the third coil of the excitation. The first end of the ninth relay switch is coupled to the system voltage, wherein the ninth relay switch is turned on in response to the fourth coil of the excitation. The buzzer is coupled to the second end of the eighth relay switch and the ninth relay switch, wherein the buzzer emits a buzzer warning when one of the eighth relay switch and the ninth relay switch is turned on.

In an embodiment of the present invention, when the electromagnetic coil has no current and electromagnetic contact When the three-phase working voltage is continuously output, the first detecting switch and the third relay switch are turned on, so that the fourth coil is excited after the preset time, and the seventh relay switch and the ninth relay switch are turned on in response to the fourth coil of the exciting. .

In an embodiment of the present invention, when the electromagnetic coil has a current and the three-phase operating voltage is abnormal, the second detecting switch, the first relay switch, and the second relay switch are turned on, so that the fourth coil is excited after a preset time. The seventh relay switch and the ninth relay switch are turned on in response to the fourth coil of the excitation.

In an embodiment of the present invention, when the electromagnetic coil has a current and the electromagnetic contactor continuously outputs the three-phase operating voltage, the first detecting switch, the first relay switch, and the second relay switch are turned on, so that the second coil is energized. The fourth relay switch and the fifth relay switch are turned on in response to the second coil of the excitation.

In an embodiment of the present invention, the power supply protection circuit forms a self-holding loop between the system voltage and the ground voltage via the fourth relay switch, the first relay switch, and the second coil, so that the second coil continues to be excited.

In an embodiment of the present invention, when the electromagnetic coil has a current and the three-phase operating voltage output by the electromagnetic contactor changes from normal to abnormal, the second detecting switch, the second relay switch, and the fifth relay switch are turned on, so that The three coils are excited by the fourth coil. The sixth relay switch and the eighth relay switch are turned on in response to the third coil of the excitation, and the seventh relay switch and the ninth relay switch are turned on in response to the fourth coil of the excitation.

The present application proposes a power supply system including an electromagnetic contactor, a load device, and a power supply protection device. The electromagnetic contactor includes an electromagnetic coil, wherein the electromagnetic contactor is turned on in response to a current flowing through the electromagnetic coil, and is output according to the output Three-phase operating voltage. The load device is coupled to the electromagnetic contactor and receives a three-phase operating voltage. The power protection device is coupled to the electromagnetic contactor for detecting an abnormal state of the electromagnetic contactor. The power protection device includes a three-phase voltage detector and a power protection circuit. The three-phase voltage detector is coupled to the electromagnetic contactor for detecting the three-phase operating voltage output by the electromagnetic contactor. The power supply protection circuit is coupled to the electromagnetic contactor and the three-phase voltage detector, wherein the power supply protection circuit is switched to the corresponding circuit configuration according to the current flowing through the electromagnetic coil and the detection result of the three-phase voltage detector.

Based on the above, the present invention provides a power supply protection device and a power supply system, and the power protection device can determine the electromagnetic contactor according to the current flowing through the electromagnetic coil of the electromagnetic contactor and the three-phase working voltage output by the electromagnetic contactor. Whether an abnormal state occurs, and when the abnormal state occurs, the control circuit breaker trips and issues a warning to remind the user to prevent the load device from being damaged.

In order to make the above features and advantages of the present invention more comprehensible, the following embodiments are described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a power supply system according to an embodiment of the present invention. Referring to FIG. 1 , the power supply system 100 includes an electromagnetic contactor 110 , a load device 120 , and a power supply protection device 130 . The electromagnetic contactor 110 includes an electromagnetic coil ML that is turned on in response to a current flowing through the electromagnetic coil ML, and accordingly outputs a three-phase operating voltage VRST. The load device 120 is coupled to the electromagnetic contactor 110 to receive the three-phase work output by the electromagnetic contactor 110 The voltage VRST is driven and driven accordingly, wherein the load device is, for example, a motor or a heater or the like.

The power supply protection device 130 is coupled to the electromagnetic contactor 110 for detecting an abnormal state of the electromagnetic contactor 110, for example, the electromagnetic contactor 110 is turned on but the three-phase working voltage VRST is not output (the electromagnetic coil ML is burned, the contact is melted or carbonized and reversed). In the case of under-equalization, the non-conducting electromagnetic contactor 110 has a three-phase operating voltage VRST output (which may occur if the main contact of the electromagnetic contactor 110 is stuck and stuck or the spring is damaged), or three-phase operation. The voltage VRST outputs an abnormal state (for example, an owed phase or only a single phase), and the like, and determines whether to activate a power supply protection mechanism according to the result of the detection, for example, a circuit breaker (not shown) of the power supply end of the electromagnetic contactor 110. Jump off to prevent the load device from being damaged 120.

Specifically, the power supply protection device 130 includes a three-phase voltage detector 132 and a power supply protection circuit 134. The three-phase voltage detector 132 is coupled to the electromagnetic contactor 110 for detecting whether the electromagnetic contactor 110 outputs a three-phase operating voltage VRST. The power supply protection circuit 134 is coupled to the electromagnetic contactor 110 and the three-phase voltage detector 132. The power supply protection circuit 134 can switch to the corresponding circuit configuration according to different abnormal states according to the current flowing through the electromagnetic coil ML and the detection result of the three-phase voltage detector 132, so as to issue corresponding prompts according to different abnormal states. In order to remind the user that the inspection must be performed, and the power terminal of the electromagnetic contactor 110 is disconnected to protect the load device 120.

In order to explain the present embodiment more clearly, FIG. 2 is a schematic diagram of a power supply system according to another embodiment of the present invention. Referring to FIG. 2 , the power supply system 200 includes an electromagnetic contactor 210 , a load device 220 , and a power protection device 230 . Circuit breaker 240 and three-phase power source 250. In the present embodiment, the power protection device 230 can provide a current path of the circuit breaker 240 according to the detected abnormal state, thereby causing it to trip, that is, the three-phase power source 250 is stopped from being supplied to the power terminal of the electromagnetic contactor 210. The circuit breaker 240 can be, for example, an Electric Leakage Breaker (ELB), an Earth Leakage Circuit Breaker (ELCB), or a No-Fuse Breaker. Not limited to this.

Further, in the present embodiment, the three-phase voltage detector 232 of the power supply protection device 230 includes a common contact C, a normally open contact NO, and a normally closed contact NC. The common contact C and the normally open contact NO form a first detecting switch DS1, and the common contact C and the normally closed contact NC form a second detecting switch DS2.

For the operation of the three-phase voltage detector 232, when the three-phase voltage detector 232 detects that the electromagnetic contactor 210 normally outputs the three-phase operating voltages VR, VS, and VT, the three-phase voltage detector 232 The common contact C is coupled to the normally open contact NO to turn on the first detection switch DS1. On the other hand, when the three-phase voltage detector 232 detects that the electromagnetic contactor 210 does not output the three-phase operating voltages VR, VS, and VT or the output three-phase operating voltages VR, VS, and VT are abnormal, the three-phase voltage is detected. The common contact C of the 232 is coupled to the normally closed contact NC to turn on the second detection switch DS2.

On the other hand, the power supply protection circuit 234 includes a system voltage, a first coil L1, a second coil L2, a third coil L3, a fourth coil L4, a first relay switch RLY1, a second relay switch RLY2, and a third relay switch. RLY3, fourth relay switch RLY4, fifth relay switch RLY5, sixth relay switch RLY6, seventh relay switch RLY7, eighth relay switch RLY8, ninth relay switch RLY9, first prompt module H1, second prompt module H2, third prompt module H3 and buzzer ALM.

Each relay switch will determine whether to turn on or off depending on whether the corresponding coil is energized. Thereby, the power supply protection circuit 234 can form different loops according to the circuit configuration of each relay switch in different states to control the corresponding prompt module to issue a prompt, and control the circuit breaker 240 to trip.

In detail, the system voltage VDD is coupled to the first ends of the first detecting switch DS1 and the second detecting switch DS2. The first coil L1 is coupled to the electromagnetic contactor 210 to be excited in response to the current of the electromagnetic coil ML. The first end of the first relay switch RLY1 is coupled to the second end of the first detecting switch DS1. The first end of the second relay switch RLY2 is coupled to the second end of the second detecting switch DS2. The first end of the third relay switch RLY3 is coupled to the second end of the first detecting switch DS1. The first relay switch RLY1 and the second relay switch RLY2 are respectively turned on in response to the excited first coil L1, and are turned off in response to the unexcited first coil L1. The third relay switch RLY3 is turned on in response to the unexcited first coil L1, and is turned off in response to the excited first coil L1.

Furthermore, the first coil L1, the first relay switch RLY1, the second relay switch RLY2, and the third relay switch RLY3 may constitute a first relay, wherein the first relay switch RLY1 corresponds to the second relay switch RLY2. At the a contact of the first relay (normally open contact), and the third relay switch RLY3 corresponds to the b connection of the first relay Point (normally closed contact). In the drawing, the first relay switch RLY1 and the second relay switch RLY2 respectively indicate L1 to indicate that the first coil L1 controlled by the excitation is turned on, and the third relay switch RLY3 indicates that L1b has been indicated to be controlled by the unexcited. The first coil L2 is turned on.

The second coil L2 is coupled between the second end of the first relay switch RLY1 and the ground voltage GND, wherein the second coil L2 is excited in response to the current flowing therethrough. The first end of the fourth detecting switch DS1 is coupled to the first end of the first detecting switch DS1, and the second end thereof is coupled to the second end of the first detecting switch DS1. The first end of the fifth relay switch RLY5 is coupled to the second end of the second detecting switch DS2. The fourth relay switch RLY4 and the fifth relay switch RLY5 are respectively turned on in response to the excited second coil L2, and are turned off in response to the unexcited second coil L2.

Furthermore, the second coil L2, the fourth relay switch RLY4 and the fifth relay switch RLY5 may constitute a second relay, wherein the fourth relay switch RLY4 and the fifth relay switch RLY5 correspond to the a contact of the second relay ( Normally open contact). In the drawing, the fourth relay switch RLY4 and the fifth relay switch RLY5 respectively indicate L2 to indicate that the second coil L2 controlled by the excitation is turned on.

The third coil L3 is coupled between the second end of the fifth relay switch RLY5 and the ground voltage GND, wherein the third coil L3 is excited in response to the current flowing therethrough. The first end of the sixth relay switch RLY6 is coupled to the circuit breaker 240, and the second end thereof is coupled to the resistor R (for example, a cement resistor having a resistance value of about 3.3 ohms). The first end of the eighth relay switch RLY8 is coupled to the system voltage VDD. Among them, the sixth relay switch RLY6 and the eighth relay The switch RLY8 is turned on in response to the excited third coil L3, and is turned off in response to the unexcited third coil L3.

Furthermore, the third coil L3, the sixth relay switch RLY6 and the eighth relay switch RLY8 may constitute a third relay, wherein the sixth relay switch RLY6 and the eighth relay switch RLY5 correspond to the a contact of the third relay ( Normally open contact). In the drawing, the sixth relay switch RLY6 and the eighth relay switch RLY8 respectively indicate L3 to indicate conduction by the third coil L3 controlled by the excitation.

The fourth coil L4 is coupled between the second end of the second relay switch RLY2 and the third relay switch RLY3 and the ground voltage GND, wherein the fourth coil RLY4 is excited by the current flowing and is excited after a preset time. The preset time can be set by the user to prevent the power supply protection circuit from being misjudged at the moment when the power state of the electromagnetic contactor 210 changes. The first end of the seventh relay switch RLY7 is coupled to the circuit breaker 240, and the second end thereof is coupled to the resistor R, that is, the seventh relay switch RLY7 is connected to the sixth relay switch RLY6. The first end of the ninth relay switch RLY9 is coupled to the system voltage VDD. The seventh relay switch RLY7 and the ninth relay switch RLY9 are respectively turned on in response to the fourth coil L4 of the excitation.

Further, the fourth coil L4, the seventh relay switch RLY7, and the ninth relay switch RLY9 may constitute a fourth relay having a timer, wherein the timer of the fourth relay starts timing when powered, and The fourth coil L4 is excited only after a preset time set by the user. Further, the seventh relay switch RLY7 and the ninth relay switch RLY9 correspond to the a contact (normally open contact) of the fourth relay, respectively. In the drawing, the seventh relay switch RLY7 and the ninth relay switch RLY9 are respectively indicated by L4 to indicate that the fourth coil L4 controlled by the excitation is turned on.

On the other hand, in the power supply protection circuit 234, the first prompt module H1 is coupled to the second coil L2. The second prompt module H2 is coupled to the third coil L3. The third prompt module H3 is coupled to the second end of the second relay switch RLY2 and the third relay switch RLY3 and the fourth coil L4. The first prompt module H1, the second prompt module H2, and the third prompt module H3 are respectively turned on when the second coil L2 is excited, and when one of the second relay switch RLY2 and the third relay switch RLY3 is turned on, and A prompt is issued when the three coil L3 is energized. For example, the first prompt module H1, the second prompt module H2, and the third prompt module H3 can be, for example, a light-emitting diode (LED), and a prompt is issued by lighting to remind the user. The electromagnetic contactor 210 has an abnormal condition. In addition, since the prompts issued by the different prompting modules can be respectively represented as the normal working state and the corresponding different abnormal states, the user can use the first prompting module H1, the second prompting module H2, and the third prompting mode. The prompt sent by the group H3 determines the abnormal condition that the electromagnetic contactor 210 may have.

The buzzer ALM is coupled to the second end of the eighth relay switch RLY8 and the ninth relay switch RLY9, wherein the buzzer ALM emits a buzzer warning when one of the eighth relay switch RLY8 and the ninth relay switch RLY9 is turned on. In order to remind the user that an abnormal situation has occurred.

It should be noted that, in this embodiment, the respective relays of the power supply protection circuit 234 (including the respective coils and their corresponding relay switches) may be separately provided or integrated on a circuit board. In addition, In other embodiments, the power protection device 230 can be further implemented in an integrated circuit manner, and the present invention does not limit the circuit implementation of the power protection device 230.

In addition, the electromagnetic contactor 210 and the load device 220 are substantially the same as the foregoing embodiment of FIG. 1, and details are not described herein again. The operation of the power supply protection device 230 in different abnormal states will be further described below, as shown in FIG. 3 to FIG. 6 , wherein FIG. 3 to FIG. 6 are schematic diagrams showing the operation of the power supply protection device according to another embodiment of the present invention.

Here, in order to make the drawings clear, some power supply protection circuits (such as the first coil L1, the sixth relay switch RLY6, the seventh relay switch RLY7, and the resistor R) are not shown in FIGS. 3 to 6. Therefore, in the operation description of the following embodiments, FIG. 2 and FIGS. 3-6 can be simultaneously referred to, thereby understanding the relevant protection mechanism of the power supply protection device 230.

FIG. 3 illustrates the circuit configuration of the power supply protection circuit 232 when the electromagnetic coil ML has no current and the electromagnetic contactor 219 continues to output the three-phase operating voltages VR, VS, and VT. Referring to FIG. 2 and FIG. 3 simultaneously, in this state, since the electromagnetic coil ML has no current, the first coil L1 is not energized, so that the third relay switch RLY3 is turned on. The first detection switch DS1 is turned on based on the three-phase operating voltages VR, VS, and VT detected by the three-phase voltage detector 232. Therefore, the power supply protection circuit 234 generates a current path through the fourth coil L4 (shown by an arrow) between the system voltage VDD and the ground voltage via the first detection switch DS1 and the third relay switch RLY3, so that The four coils L4 are excited after a preset time. Wherein, the third prompt module H3 is issued when the third relay switch RLY3 is turned on. prompt.

At this time, the seventh relay switch RLY7 and the ninth relay switch RLY9 are turned on in response to the fourth coil L4 of the excitation, so that the circuit breaker 240 forms a current path through the seventh relay switch RLY7 and the resistor R, causing the circuit breaker 240 to jump. The off-phase is supplied to the power supply end of the electromagnetic contactor 210 to interrupt the three-phase power supply 250. In addition, the conduction of the ninth relay switch RLY9 causes the system voltage to be supplied to the buzzer ALM to cause the buzzer ALM to emit a buzzer warning to remind the user of an abnormal condition.

4 is a circuit configuration of the power supply protection circuit 232 when the electromagnetic coil ML has current but the three-phase operating voltages VR, VS, and VT output by the electromagnetic contactor 219 are abnormal. Referring to FIG. 2 and FIG. 4 simultaneously, in this state, since the electromagnetic coil ML has a current, the first coil L1 is excited by the current flowing through the electromagnetic coil ML, so that the first relay switch RLY1 and the second relay switch RLY2 is turned on. The second detection switch DS2 is turned on because the three-phase voltage detector 232 does not detect the three-phase operating voltages VR, VS, and VT. Therefore, the power supply protection circuit 234 generates a current path (shown by an arrow) passing through the fourth coil L4 via the second detection switch DS2 and the second relay switch RLY2 between the system voltage VDD and the ground voltage GND. The fourth coil L4 is excited after a preset time. The third prompting module H3 will prompt when the second relay switch RLY2 is turned on.

Similar to the situation of the embodiment of FIG. 3, at this time, the seventh relay switch RLY7 and the ninth relay switch RLY9 are turned on in response to the fourth coil L4 of the excitation, and the circuit breaker 240 is tripped. In addition, the ninth relay switch RLY9 When turned on, the buzzer ALM emits a buzzer warning to remind the user of an abnormal condition.

FIG. 5 is a diagram showing the circuit configuration of the power supply protection circuit 232 when the electromagnetic coil ML has a current and the electromagnetic contactor 219 normally outputs the three-phase operating voltages VR, VS, and VT. This state is that the electromagnetic contactor 210 has no abnormality, and normally supplies the three-phase operating voltages VR, VS, and VT to the state of the load device 220. Referring to FIG. 2 and FIG. 5 simultaneously, in this state, the first coil L1 is excited in response to the current flowing through the electromagnetic coil ML, and the three-phase voltage detector 232 is based on the detected three-phase operating voltages VR, VS. And VT to turn on the common contact C and the normally open contact NO. Therefore, the first detection switch DS1 and the first relay switch RLY1 are respectively turned on, so that the power supply protection circuit 234 generates a pass between the system voltage VDD and the ground voltage GND via the first detection switch DS1 and the first relay switch RLY1. The current path of the second coil L2 (as indicated by the arrow) causes the second coil L2 to be excited, and at the same time causes the first prompting module H1 to issue a prompt.

At this time, the fourth relay switch RLY4 and the fifth relay switch RLY5 are turned on in response to the excited second coil L2, and the power supply protection circuit 234 is further between the system voltage VDD and the ground voltage GND, via the fourth relay switch RLY4, The first relay switch RLY1 and the second coil L2 form a self-holding loop. Therefore, even if the first detecting switch DS1 is turned off, the second coil L2 can continue to be excited by the self-holding loop.

6 is a circuit configuration of the power supply protection circuit 232 when the electromagnetic coil ML has a current and the three-phase operating voltages VR, VS, and VT output by the electromagnetic contactor 219 are abnormally outputted from the normal output. Please also refer to the map 2 and FIG. 6, in this state, the first coil L1 is still in an excited state, and the three-phase voltage detector 232 turns on the common contact C based on the abnormal three-phase operating voltages VR, VS, and VT. Close the point NC. Therefore, the first detecting switch DS1 is turned off, and the second detecting switch DS2 is turned on correspondingly. Further, the fourth relay switch RLY4 and the fifth relay switch RLY5 are continuously turned on in response to the second coil L2 that is continuously excited.

At this time, the power supply protection circuit 234 generates a third pass between the system voltage VDD and the ground voltage GND via the second detection switch DS2 and the fifth relay switch RLY5 and the second detection switch DS2 and the second relay switch RLY2, respectively. The current path of the coil L3 and the fourth coil L4 (as indicated by the arrow) causes the third coil L3 and the fourth coil L4 to be excited, and at the same time, the second prompting module H2 and the third module H3 are prompted.

After the third coil L3 and the fourth coil L4 are excited, the sixth relay switch RLY6 and the seventh relay switch RLY7 are respectively turned on in response to the excited third coil L3 and the fourth coil L4, and cause the circuit breaker 240 to trip. In addition, the eighth relay switch RLY8 and the ninth relay RLY9 are also turned on according to the third coil L3 and the fourth coil L4 of the excitation, so that the buzzer ALM emits a buzzer alert to remind the user that an abnormal condition has occurred.

It is worth noting that in the current path formed by the circuit breaker 240 and the sixth relay switch RLY6 (or the seventh relay switch RLY7) and the resistor R, the user can add an additional control switch to the current path according to the demand. It is determined by other discriminating conditions whether or not to cause the circuit breaker 240 to trip.

In summary, the present invention provides a power protection device and a power supply system, and the power protection device can determine the electromagnetic force according to the current flowing through the electromagnetic coil of the electromagnetic contactor and the three-phase working voltage output by the electromagnetic contactor. Whether the contactor has an abnormal state occurs, and when the abnormal state occurs, the control circuit breaker trips and issues an alert to remind the user to prevent the load device from being damaged.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any person having ordinary knowledge in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of protection of this creation is subject to the definition of the scope of the patent application attached.

100, 200‧‧‧ power supply system

110, 210‧‧‧Electromagnetic contactors

120, 220‧‧‧ load device

130, 230‧‧‧Power protection device

132, 232‧‧‧Three-phase voltage detector

134, 234‧‧‧ power supply protection circuit

240‧‧‧Circuit breaker

250‧‧‧Three-phase power supply

C‧‧‧Common joints

DS1‧‧‧first detection switch

DS2‧‧‧Second detection switch

NC‧‧‧Normally closed joints

NO‧‧‧Normally open contacts

ML‧‧‧Electromagnetic coil

L1‧‧‧ first coil

L2‧‧‧second coil

L3‧‧‧ third coil

L4‧‧‧fourth coil

RLY1‧‧‧First Relay Switch

RLY2‧‧‧Second relay switch

RLY3‧‧‧third relay switch

RLY4‧‧‧fourth relay switch

RLY5‧‧‧ fifth relay switch

RLY6‧‧‧ sixth relay switch

RLY7‧‧‧ seventh relay switch

RLY8‧‧‧ eighth relay switch

RLY9‧‧‧ninth relay switch

H1‧‧‧First Tip Module

H2‧‧‧Second prompt module

H3‧‧‧ Third reminder module

ALM‧‧‧ buzzer

VR, VS, VT, VRST‧‧‧ three-phase working voltage

VDD‧‧‧ system voltage

GND‧‧‧ Grounding voltage

FIG. 1 is a schematic diagram of a power supply system according to an embodiment of the present invention.

2 is a schematic diagram of a power supply system according to another embodiment of the present invention.

3-6 are schematic diagrams showing the operation of the power protection device according to another embodiment of the present invention.

100‧‧‧Power supply system

110‧‧‧Electromagnetic contactor

120‧‧‧Load device

130‧‧‧Power protection device

132‧‧‧Three-phase voltage detector

134‧‧‧Power protection circuit

ML‧‧‧Electromagnetic coil

VRST‧‧‧Three-phase working voltage

Claims (22)

A power supply protection device is adapted to detect an abnormal state of an electromagnetic contactor, wherein the electromagnetic contactor comprises an electromagnetic coil, and the electromagnetic contactor is turned on in response to a current flowing through the electromagnetic coil, and outputs a three-phase operation according to the output a voltage to a load device, the power protection device comprising: a three-phase voltage detector coupled to the electromagnetic contactor for detecting the three-phase operating voltage output by the electromagnetic contactor; and a power supply protection circuit coupled The electromagnetic contactor and the three-phase voltage detector are connected, wherein the power supply protection circuit is switched to a corresponding circuit configuration according to a current flowing through the electromagnetic coil and a detection result of the three-phase voltage detector. The power protection device of claim 1, wherein the three-phase voltage detector comprises a common contact, a normally open contact, and a normally closed contact, the common contact and the normally open contact Forming a first detecting switch, and the common contact and the normally closed contact form a second detecting switch, wherein when the three-phase voltage detector detects the three-phase operating voltage output by the electromagnetic contactor Normally, the three-phase voltage detector turns on the first detecting switch, and when the three-phase voltage detector detects that the three-phase working voltage output by the electromagnetic contactor is abnormal, the three-phase voltage detecting The second conduction switch is turned on. The power protection device according to claim 2, further comprising: a circuit breaker coupled between the three-phase power source and the electromagnetic contactor, controlled by the power supply protection circuit to determine whether to make the electromagnetic contact The device is disconnected from the three-phase power supply. The power supply protection device of claim 3, wherein the power supply protection circuit comprises: a system voltage coupled to the first detection switch and the first end of the second detection switch; a first coil, The first contact switch is coupled to the second end of the first detection switch, wherein the first relay switch is responsive to the excitation The first coil is turned on; the second end of the second relay switch is coupled to the second end of the second detecting switch, wherein the second relay switch is turned on in response to the first coil of the exciting; a relay switch having a first end coupled to the second end of the first detecting switch, wherein the third relay switch is turned on in response to the unexcited first coil; and a second coil coupled to the first relay The second end of the switch is coupled to a ground voltage to be excited by a current flowing through the first relay switch, the first end of which is coupled to the first end of the first detecting switch, and the second end is coupled The second end of the first detecting switch, The fourth relay switch is turned on in response to the second coil of the excitation; a fifth relay switch has a first end coupled to the second end of the second detection switch, wherein the fifth relay switch is reactive to the excitation The second coil is turned on; a third coil is coupled to the second end of the fifth relay switch and the A grounding voltage is excited by a current flowing through the current; a sixth relay switch having a first end coupled to the circuit breaker and a second end coupled to a resistor, wherein the sixth relay switch is reactive The fourth coil is electrically connected; a fourth coil is coupled between the second relay switch and the second end of the third relay switch and the ground voltage, wherein the fourth coil reacts with the current flowing through And a seventh relay switch having a first end coupled to the circuit breaker and a second end coupled to the resistor, wherein the seventh relay switch is turned on in response to the fourth coil of the excitation . The power protection device of claim 4, wherein the power protection circuit further comprises: a first prompt module coupled to the second coil, wherein the first prompt module is activated when the second coil is excited a second prompting module is coupled to the third coil, wherein the second prompting module issues a prompt when the third coil is excited; and a third prompting module is coupled to the second relay switch The second end of the third relay switch, wherein the third prompting module issues a prompt when one of the second relay switch and the third relay switch is turned on. The power protection device of claim 5, wherein the power protection circuit further comprises: an eighth relay switch, the first end of which is coupled to the system voltage, wherein the eighth relay switch is reactive with the excitation a third coil is turned on; a ninth relay switch having a first end coupled to the system voltage, The ninth relay switch is turned on in response to the fourth coil of the excitation; and a buzzer coupled to the eighth end of the eighth relay switch and the ninth relay switch, wherein the buzzer is in the eighth A buzzer warning is issued when one of the relay switch and the ninth relay switch is turned on. The power protection device of claim 6, wherein when the electromagnetic coil has no current and the electromagnetic contactor continuously outputs the three-phase working voltage, the first detecting switch and the third relay switch are turned on, so that The fourth coil is excited after the preset time, and the seventh relay switch and the ninth relay switch are turned on in response to the fourth coil of the excitation. The power protection device according to claim 6, wherein when the electromagnetic coil has a current and the three-phase operating voltage is abnormal, the second detecting switch, the first relay switch and the second relay switch are turned on, The fourth coil is excited after the preset time, and the seventh relay switch and the ninth relay switch are turned on in response to the fourth coil of the excitation. The power protection device of claim 6, wherein the first detection switch, the first relay switch, and the second relay switch are turned on when the electromagnetic coil has a current and the three-phase operating voltage is normal. The second coil is energized, and the fourth relay switch and the fifth relay switch are turned on in response to the second coil of the excitation. The power protection device of claim 9, wherein the power protection circuit forms a self-holding loop between the system voltage and the ground voltage via the fourth relay switch, the first relay switch, and the second coil. So that the second coil continues to be excited. The power protection device according to claim 10, wherein when the electromagnetic coil has a current and the three-phase operating voltage output by the electromagnetic contactor changes from normal to abnormal, the second detecting switch, the first The second relay switch and the fifth relay switch are turned on to cause the third coil to be excited with the fourth coil, the sixth relay switch and the eighth relay switch are turned on in response to the third coil of the excitation, and the seventh relay The switch and the ninth relay switch are turned on in response to the fourth coil of the excitation. A power supply system comprising: an electromagnetic contactor comprising an electromagnetic coil, wherein the electromagnetic contactor is turned on in response to a current flowing through the electromagnetic coil, and accordingly outputs a three-phase operating voltage; a load device coupled to the An electromagnetic contactor receives the three-phase working voltage; and a power supply protection device coupled to the electromagnetic contactor for detecting an abnormal state of the electromagnetic contactor, the power supply protection device comprising: a three-phase voltage detector, coupled Connecting the electromagnetic contactor to detect the three-phase working voltage output by the electromagnetic contactor; and a power supply protection circuit coupled to the electromagnetic contactor and the three-phase voltage detector, wherein the power supply protection circuit is based on the flow The current through the electromagnetic coil and the detection result of the three-phase voltage detector are switched to the corresponding circuit configuration. The power supply system of claim 12, wherein the three-phase voltage detector comprises a common contact, a normally open contact, and a normally closed contact, the common contact and the normally open contact form a first detection switch, and The common contact and the normally closed contact form a second detecting switch, wherein when the three-phase voltage detector detects that the three-phase operating voltage output by the electromagnetic contactor is normal, the three-phase voltage detecting The first detection switch is turned on, and when the three-phase voltage detector detects that the three-phase operating voltage output by the electromagnetic contactor is abnormal, the three-phase voltage detector turns on the second detection switch. The power supply system of claim 13, further comprising: a circuit breaker coupled between the three-phase power source and the electromagnetic contactor, controlled by the power supply protection circuit to determine whether to apply the electromagnetic contactor Disconnected from the three-phase power supply. The power supply system of claim 14, wherein the power supply protection circuit comprises: a system voltage coupled to the first detection switch and the first end of the second detection switch; a first coil coupled Connecting the electromagnetic contactor to react with the current of the electromagnetic coil to excite; a first relay switch having a first end coupled to the second end of the first detecting switch, wherein the first relay switch is reactive with the excitation a first coil is electrically connected; a second relay is coupled to the second end of the second detecting switch, wherein the second relay switch is turned on in response to the first coil of the excitation; a third relay a switch, the first end of which is coupled to the first detecting switch a second end, wherein the third relay switch is turned on in response to the unexcited first coil; a second coil is coupled between the second end of the first relay switch and a ground voltage, and reacts to flow through a fourth relay switch having a first end coupled to the first end of the first detecting switch and a second end coupled to the second end of the first detecting switch, wherein the fourth relay The switch is electrically connected to the second coil of the excitation; a fifth relay is coupled to the second end of the second detection switch, wherein the fifth relay is reactive with the second coil of the excitation Turning on; a third coil coupled between the second end of the fifth relay switch and the ground voltage, reacting with a current flowing through the magnet; and a sixth relay switch having a first end coupled to the circuit breaker And the second end is coupled to a resistor, wherein the sixth relay switch is turned on in response to the third coil of the excitation; a fourth coil is coupled to the second relay switch and the second relay switch Reaction between the terminal and the ground voltage The current flowing through is excited after a predetermined time; a seventh relay switch having a first end coupled to the circuit breaker and a second end coupled to the resistor, wherein the seventh relay switch is reactive with the excitation The fourth coil is turned on. The power supply system of claim 15 , wherein the power protection circuit further comprises: a first prompt module coupled to the second coil, wherein the first prompt The module emits a prompt when the second coil is excited; a second prompting module is coupled to the third coil, wherein the second prompting module issues a prompt when the third coil is excited; and a third prompting module The second relay switch is coupled to the second end of the third relay switch, wherein the third prompting module issues a prompt when one of the second relay switch and the third relay switch is turned on. The power supply system of claim 15, wherein the power protection circuit further comprises: an eighth relay switch, the first end of which is coupled to the system voltage, wherein the eighth relay switch is reactive with the excitation a third coil is turned on; a ninth relay switch having a first end coupled to the system voltage, wherein the ninth relay switch is turned on in response to the fourth coil of the excitation; and a buzzer coupled to the eighth And a second end of the ninth relay switch, wherein the buzzer emits a buzzer warning when the eighth relay switch and the ninth relay switch are turned on. The power supply system of claim 17, wherein the first detecting switch and the third relay switch are turned on when the electromagnetic coil has no current and the electromagnetic contactor continuously outputs the three-phase operating voltage, so that the The fourth coil is energized after the preset time, and the seventh relay switch and the ninth relay switch are turned on in response to the fourth coil of the excitation. The power supply system of claim 17, wherein when the electromagnetic coil has a current and the three-phase operating voltage is abnormal, the second detecting switch, the first relay switch, and the second relay switch are turned on, The fourth coil is excited after the preset time, and the seventh relay switch and the ninth relay switch are turned on in response to the fourth coil of the excitation. The power supply system of claim 17, wherein the first detecting switch, the first relay switch, and the second relay switch are turned on when the electromagnetic coil has a current and the three-phase operating voltage is normal. The second coil is energized, and the fourth relay switch and the fifth relay switch are turned on in response to the second coil of the excitation. The power supply system of claim 17, wherein the power protection circuit forms a self-holding loop between the system voltage and the ground voltage via the fourth relay switch, the first relay switch, and the second coil. The second coil is continuously excited. The power supply system of claim 21, wherein when the electromagnetic coil has a current and the three-phase operating voltage output by the electromagnetic contactor changes from normal to abnormal, the second detecting switch, the second The relay switch and the fifth relay switch are turned on to cause the third coil to be excited with the fourth coil, the sixth relay switch and the eighth relay switch are turned on in response to the third coil of the excitation, and the seventh relay switch The ninth relay switch is turned on in response to the fourth coil of the excitation.