A solid heat storage type electric heating device group operation overpower protection device

Abstract

A solid heat storage type electric heating device group operation overpower protection device, including a device power occupancy acquisition unit, a constant current source adder, a set power value generator, a comparator, and an output control unit. The device power occupancy acquisition unit has multiple units, which respectively collect power occupancy signals of corresponding devices and transmit them to the constant current source adder. The constant current source adder is also connected to a constant current source. The constant current source adder outputs the total occupancy rate obtained by addition operation to the comparator. The comparator compares the received total occupied power value with the protection value generated by the reserved power value generator. The final result is connected to the output control unit. There are multiple control units, which correspond to the heating enable end of the device respectively, to play a protective role. The present invention adopts a complete hardware protection circuit with high reliability, ensuring that the power reserved by the user's power distribution system is not exceeded, and ensuring the safety of power use.

Description

Technical Field

[0001] The invention relates to the technical field of electrical protection, in particular to an overpower protection device for group operation of solid heat storage type electric heating devices. Background Art

[0002] A solid thermal storage electric heating device refers to a system that uses an appropriate method and a specific device to convert off-peak electricity or other types of electrical energy into thermal energy, stores it through certain thermal storage materials, and releases it for use when needed.

[0003] When a group of high-power solid thermal storage devices of 10kV or above is in operation, sometimes the total power of the devices is greater than the maximum power reserved by the user's power distribution system. Generally, the host computer control method is used to make the devices start time-sharing heating in turn, so that the power used does not exceed the power reserved by the user's power distribution system. The host computer generally involves communication and complex program operations, which are prone to failure. In order to ensure that the power does not exceed the limit when the host computer has operating errors or other failures, a more reliable protection method is needed. Summary of the invention

[0004] The object of the present invention is to provide a solid heat storage type electric heating device group operation overpower protection device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A solid heat storage type electric heating device group operation overpower protection device, including a device power occupancy acquisition unit, a constant current source adder, a reserved power value generator, a comparator, and an output control unit. The device power occupancy acquisition unit has multiple units, which respectively collect power occupancy signals of corresponding devices and transmit them to the constant current source adder. The constant current source adder is also connected to a constant current source. The constant current source adder outputs the total occupancy rate obtained by addition operation to the comparator. The comparator compares the received total occupied power value with the protection value generated by the reserved power value generator, and the final result is connected to the output control unit. The control unit has multiple units, which respectively correspond to the heating enable ends of the devices to play a protective role.

[0007] As a further solution of the present invention: the comparator is a voltage comparator.

[0008] As a further solution of the present invention: the comparator has a self-locking function, and once the protection is triggered, it will self-lock and maintain the output.

[0009] As a further solution of the present invention: the protection value generated by the reserved power value generator is settable.

[0010] As a further solution of the present invention: the adder output is connected to an occupied power display.

[0011] As a further solution of the present invention: the output end of the set power value generator is connected to a reserved power display.

[0012] As a further solution of the present invention: the output end of the comparator is also connected to an alarm prompt module.

[0013] As a further solution of the present invention: it also includes a power supply module for supplying power to each module.

[0014] Compared with the prior art, the invention has the following beneficial effects: the protection device is simple and reliable, plays a redundant protection role, and provides reliable protection when the usual overpower protection mode fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall principle block diagram of the present invention;

[0016] Figure 2 It is the schematic diagram of the adding circuit;

[0017] Figure 3 It is a schematic diagram of the circuit operation of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1 A solid heat storage type electric heating device group operation overpower protection device, including a device power occupancy acquisition unit, a constant current source adder, a set power value generator, a comparator, and an output control unit. It is characterized in that there are multiple device power occupancy acquisition units, which respectively collect power occupancy signals of corresponding devices and transmit them to the constant current source adder. The constant current source adder is also connected to a constant current source. The constant current source adder outputs the total occupancy rate obtained by addition operation to the comparator. The comparator compares the received total occupied power value with the protection value generated by the reserved power value generator. The final result is connected to the output control unit. There are multiple control units, which correspond to the heating enable ends of the devices respectively to play a protective role.

[0020] The adder principle is as follows Figure 2 As shown,

[0021] A constant current passes through a resistor, and the voltage across the resistor is proportional to the resistance value. The voltage represents the size of the resistor. If the resistance value corresponds to the electrical power of the device, the voltage represents the electrical power of the device. Therefore, the sum of the voltages is the sum of the electrical powers, and the addition calculation is completed using a hardware circuit.

[0022] The detailed principle of this implementation case is as follows Figure 3 As shown, this implementation case is applicable to six devices.

[0023] In the figure, the constant current source is the U1 chip, which generates a constant current of 20mA, and the size of the constant current is corrected by R8;

[0024] The power occupancy signals sent by the six devices are connected to K1-K6 respectively. When K1-K6 is connected, it means that the power of the corresponding device is not occupied, and when it is disconnected, it means that it is occupied. If K1 is disconnected, it means that the 1# device is in the power occupancy state. At this time, the current generated by the constant current source passes through the resistor R1. The voltage across the resistor R1 is 5V, which can represent that the power occupied by the 1# device is 5MW. The same is true for the other power occupancy. The total voltage represents the total occupied power. This voltage is connected to a digital display U4, indicating the total occupied power at this time.

[0025] Potentiometer R9 generates a voltage representing the reserved power value, and this voltage is connected to a digital display U3 to indicate the reserved power value at that time.

[0026] The voltage representing the total occupied power is sent to the non-inverting input terminal of the voltage comparator U2A, and the voltage representing the reserved power value is sent to the inverting input terminal of the voltage comparator U2A. When the voltage at the non-inverting input terminal is greater than the voltage at the inverting input terminal, U2A outputs a high voltage, Q1 is turned on, K7-K12 is energized, the contacts are disconnected, and the heating enable terminals of devices 1# - 6# are disconnected, making heating impossible.

[0027] When Q1 is turned on, X2 and LS1 work at the same time, and an audible and visual alarm is issued.

[0028] Q1 is turned on and passes through D1 and S1 at the same time, making the reverse input terminal of U2A become a low voltage, causing U2A to self-lock. S1 can be released by pressing it manually.

[0029] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0030] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A solid heat storage type electric heating device group operation overpower protection device, comprising an equipment power occupancy acquisition unit, a constant current source adder, a reserved power value generator, a comparator, and an output control unit, characterized in that: There are multiple device power occupancy collection units, which respectively collect power occupancy signals of corresponding devices and transmit them to a constant current source adder. A constant current source is also connected to the constant current source adder. The constant current source adder outputs the total occupancy rate obtained through addition operation to a comparator. The comparator compares the received total occupied power value with the protection value generated by the reserved power value generator. The final result is connected to an output control unit. There are multiple control units, which respectively correspond to the heating enable ends of the devices to play a protective role.

2. The solid heat storage type electric heating device group operation overpower protection device according to claim 1, characterized in that: The comparator is a voltage comparator.

3. The solid heat storage type electric heating device group operation overpower protection device according to claim 2, characterized in that: The comparator has a self-locking function, and once the protection is triggered, it will self-lock and maintain the output.

4. The solid heat storage type electric heating device group operation overpower protection device according to claim 1, characterized in that: The protection value generated by the reserved power value generator is settable.

5. The solid heat storage type electric heating device group operation overpower protection device according to claim 1, characterized in that: The adder output is connected to an occupied power display.

6. The solid heat storage type electric heating device group operation overpower protection device according to claim 1, characterized in that: The output end of the reserved power value generator is connected with a reserved power display.

7. The solid heat storage type electric heating device group operation overpower protection device according to claim 1, characterized in that: The output end of the comparator is also connected to an alarm prompt module.

8. The solid heat storage type electric heating device group operation overpower protection device according to claim 4, characterized in that: It also includes a power supply module for supplying power to each module.

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