Portable energy storage power supply for preventing complete power failure caused by overload alternating current output

Abstract

A portable energy storage power supply for preventing complete power failure due to overload alternating current output comprises a plurality of sockets, each socket is located in a control loop, and each control loop specifically comprises an RC absorption circuit formed by connecting a bidirectional silicon controlled rectifier, a fourth current limiting resistor and a capacitor in series. A grid electrode of the bidirectional silicon controlled rectifier is connected with a phototriode and a second current-limiting resistor in the optocoupler, an LED in the optocoupler is connected with a first current-limiting resistor and a triode in series, a pin in the single-chip microcomputer is connected with a third current-limiting resistor and a base electrode of the triode in series, a signal of the switch is sent to control on and off of the triode, and the current sensor is connected to one pin of the MCU. And the MCU switches off one of the bidirectional silicon controlled rectifiers according to the received data of the current sensor when the power of all the electric equipment exceeds the rated power. According to the utility model, the problem that the original normal operation electric equipment is also shut down after the whole alternating current output is powered off due to overload of a plurality of electric equipment is solved.

Description

Technical Field

[0001] The utility model belongs to the field of overload current protection and relates to a portable energy storage power supply which can be used to prevent complete power failure of AC output due to overload. Background Art

[0002] Portable energy storage power supplies are used to provide AC power to electrical equipment. Most power supplies have two or more AC output interfaces, but the AC output circuit of the power module has only one loop. Therefore, when multiple electrical equipment are working, if the added electrical equipment causes the load of the entire electrical equipment to increase and exceed the maximum rated load of the power supply, the power supply will inevitably be overloaded. At this time, all AC sockets are powered off. This solves the problem that when multiple electrical equipment are overloaded, the entire AC output is powered off, affecting the shutdown of the electrical equipment that was originally operating normally. Summary of the invention

[0003] 1. Technical problems to be solved:

[0004] When the energy storage power supply is used for multiple electrical devices, the power supply may be cut off due to overload, which causes other electrical devices that are normally operating to shut down due to power outage.

[0005] 2. Technical solution:

[0006] In order to solve the above problems, the utility model provides a portable energy storage power supply for preventing complete power failure of AC output due to overload, including multiple sockets, each socket is located in a control loop, and each of the control loops specifically includes: an RC absorption circuit consisting of a bidirectional thyristor, a fourth current limiting resistor and a capacitor in series, the bidirectional thyristor controls the power supply of the socket by turning on and off, the gate of the bidirectional thyristor is connected to the phototransistor and the second current limiting resistor in the optocoupler, the LED in the optocoupler is connected to the first current limiting resistor and the transistor in series, a pin in the single-chip microcomputer is connected in series with the third current limiting resistor and the base of the transistor, a switch signal is sent to control the switch of the transistor, a current sensor is connected to a pin of the MCU, and the MCU turns off one of the bidirectional thyristors when the power of all electrical devices exceeds the rated power based on the data received from the current sensor.

[0007] The data of the current sensor includes whether there is an electrical device plugged into the socket, the real-time current of the socket and the order in which the electrical devices are plugged into the socket. When the power of all electrical devices exceeds the rated power, the MCU turns off the bidirectional thyristor connected to the socket of the later inserted electrical device, and interrupts the power supply to the socket of the later inserted electrical device.

[0008] The capacitance value is 0.01uF~0.47uF, and the fourth current limiting resistor value range is 47~100Ω.

[0009] There are two sockets.

[0010] The socket is an AC socket.

[0011] When the energy storage power supply output is turned on normally, all bidirectional thyristors are turned on, and all the sockets have AC power.

[0012] 3. Beneficial effects:

[0013] When one electrical device is in normal use, and a second electrical device is plugged in, causing the entire AC load to exceed the rated load of the energy storage power supply, the MCU determines which is the current socket circuit of the first electrical device based on the sensor signal. At this time, the thyristor in the circuit of the first electrical device remains open, and the thyristor in the circuit of the later electrical device is closed, solving the problem that when the entire AC output is cut off due to overload of multiple electrical devices, the electrical devices that were originally operating normally are also shut down. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the control circuit.

[0015] Figure 2 It is a schematic diagram of an embodiment of the utility model.

[0016] Description of the accompanying drawings: 1. socket; 2. bidirectional thyristor; 3. fourth current limiting resistor; 4. capacitor; 5. optocoupler; 6. second current limiting resistor; 7. first current limiting resistor; 8. transistor; 9. third current limiting resistor; 10. current sensor. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings.

[0018] A portable energy storage power supply for preventing complete power failure of AC output due to overload, comprising a plurality of sockets 1, each of which is located in a control loop, and each of the control loops is specifically:

[0019] As shown in 1, a RC absorption circuit is formed by a bidirectional thyristor 2, a fourth current limiting resistor 3 and a capacitor 4 connected in series. The RC absorption circuit suppresses the (dv / dt)c value applied to the bidirectional thyristor 2. When the bidirectional thyristor 2 switch controls the inductive load, if (di / dt)c and (dv / dt)c exceed a certain value due to the current delay during the conversion period, (di / dt)c and (dv / dt)c may enter the on state without the gate signal, thus becoming uncontrollable.

[0020] In one embodiment, the capacitor 4 can have a value of 0.01uF~0.47uF, and the fourth current limiting resistor 3 has a value range of 47~100Ω

[0021] The bidirectional thyristor 2 controls the power supply of the socket 1 by turning it on and off. The gate of the bidirectional thyristor 2 is connected to the phototransistor in the optocoupler 5 and the second current limiting resistor 7. The LED in the optocoupler 5 is connected in series with the first current limiting resistor 6 and the transistor / 8, so as to control the conduction and closing of the bidirectional thyristor 2.

[0022] A pin in the MCU is connected in series with the third current limiting resistor 9 and the base of the transistor 8, and a switch signal is sent to control the switch of the transistor 8. The current sensor 10 is connected to a pin of the MCU. According to the data received from the current sensor 10, when the power of all electrical devices exceeds the rated power, the MCU turns off one of the bidirectional thyristors 2, that is, interrupts the power supply to one of the sockets 1, so that the inserted electrical device is powered off, reducing the entire energy storage power supply, and the electrical devices on the remaining sockets 1 will not be affected in normal use if the total power does not exceed the rated power. The problem of the original normal operation of the electrical devices being shut down after the entire AC output is powered off due to the overload of multiple electrical devices is solved.

[0023] The following is an example of two sockets.

[0024] like Figure 2 As shown, there are two sockets 1 for electrical devices in the energy storage device, and the control circuit of each socket is exactly the same, and the connection method with the MCU is: the third current limiting resistor 9 in the control circuit of one socket is connected to the lead 20 of the MCU, and the current sensor 10 is connected to the lead 19 of the MCU; in the control circuit of the other socket, the third current limiting resistor 9 is connected to the lead 12 of the MCU, and the current sensor 10 is connected to the lead 11 of the MCU.

[0025] One embodiment is a case of multiple sockets in the prior art:

[0026] 1. Assume that the power of the energy storage power supply is 2000W, and a power consumption device is 1000W and connected to a socket for normal use

[0027] 2. When the second electrical device is 1500W and connected to another socket for use, the entire AC output load is greater than the 2000W load of the power supply, then the energy storage power supply will normally shut down all AC sockets.

[0028] When using the control circuit of the utility model, when one electric device is in normal use, when a second electric device is plugged in, causing the entire AC load to exceed the rated load of the energy storage power supply, the MCU determines which is the current socket circuit of the first electric device according to the current sensor signal. At this time, the bidirectional thyristor in the circuit of the first electric device remains open, and the bidirectional thyristor in the circuit of the later plugged in electric device is closed.

[0029] The conditions are the same as those of the prior art embodiment:

[0030] 1. Assume that the power of the energy storage power source is 2000W, and a power-consuming device is 1000W and connected to a socket for normal use;

[0031] 2. When the second electrical device with a power of 1500W is connected to another socket for use, the entire AC output load is greater than the 2000W load of the power supply. The bidirectional thyristor in the circuit of the first electrical device remains open and is used normally, and the bidirectional thyristor in the circuit of the electrical device that is plugged in later is closed.

[0032] In one embodiment, when the AC output of the energy storage power supply is normally turned on, the two bidirectional thyristors are in an open state, and both AC sockets have AC power.

Claims

1. A portable energy storage power supply for preventing complete power failure of AC output due to overload, comprising a plurality of sockets, characterized in that: A control circuit is provided in each socket, and each of the control circuits specifically includes an RC absorption circuit consisting of a bidirectional thyristor, a fourth current limiting resistor and a capacitor connected in series. The bidirectional thyristor controls the power supply of the socket by turning it on and off. The gate of the bidirectional thyristor is connected to the phototransistor and the second current limiting resistor in the optocoupler. The LED in the optocoupler is connected in series with the first current limiting resistor and the transistor. A pin in the MCU is connected in series with the third current limiting resistor and the base of the transistor. The switch signal is sent to control the switch of the transistor. The current sensor is connected to a pin of the MCU. The MCU turns off one of the bidirectional thyristors when the power of all electrical devices exceeds the rated power based on the data received from the current sensor.

2. The portable energy storage power supply for preventing AC output from being completely cut off due to overload as claimed in claim 1, characterized in that : The data of the current sensor includes whether there is an electrical device plugged into the socket, the real-time current of the socket and the order in which the electrical devices are plugged into the socket. When the power of all electrical devices exceeds the rated power, the MCU turns off the bidirectional thyristor connected to the socket of the later inserted electrical device, and interrupts the power supply to the socket of the later inserted electrical device.

3. The portable energy storage power supply for preventing AC output from being completely cut off due to overload as claimed in claim 1, characterized in that: The capacitance value is 0.01uF~0.47uF, and the fourth current limiting resistor value range is 47~100Ω.

4. The portable energy storage power supply for preventing AC output from being completely cut off due to overload according to any one of claims 1 to 3, characterized in that: There are two sockets.

5. The portable energy storage power supply for preventing AC output from being completely cut off due to overload according to any one of claims 1 to 3, characterized in that: The socket is an AC socket.

6. The portable energy storage power supply for preventing AC output from being completely cut off due to overload according to any one of claims 1 to 3, characterized in that: When the energy storage power supply output is turned on normally, all bidirectional thyristors are in the turned-on state, and all the sockets have AC power.

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