Intelligent load switching device

Abstract

An intelligent load switching device comprises a generator, the output end of the generator is connected with at least two output units of the same structure, the first output unit is provided with the first output end of the generator, and the first output end of the generator serves as a load output end after being connected with a current detection module U1, a current detection module U2 and a relay switch J1 in series. A voltage detection module L1 is connected in parallel between the first output end of the generator and the current detection module U1, and two ends of the relay switch J1 are connected in parallel with an isolation optocoupler module IC1; an MCU control module is further arranged, the input end of the MCU control module is connected with the current detection module U1, the current detection module U2, the voltage detection module L1 and the secondary low-voltage output end of the isolation optocoupler module IC1, and the output end of the MCU control module is connected with a control coil of the relay switch J1.

Description

TECHNICAL FIELD

[0001] The utility model relates to generator technical field, concretely relates to a load intelligent switching device. BACKGROUND

[0002] With the rapid development of digital frequency conversion generator, the prior art uses the AC generator to send AC power to the equipment, but the generator does not effectively prevent and handle whether the load equipment exceeds the rated power of the generator when using, the generator in the prior art is generally connected with the plugboard of multiple sockets, if multiple loads are connected, when the total load exceeds the rated load of the generator, the generator can be overloaded for a long time, this method can shorten the service life of the generator, and the unstable generator after overload can damage the equipment, if the rated power of the socket is exceeded, the long-time overload use can cause the socket to heat and damage, or a safety accident occurs. UTILITY MODEL CONTENTS

[0003] I. technical problems solved

[0004] The utility model discloses a load intelligent switching device, which can automatically cut off the power equipment when the generator generates unstable power, avoid the damage of voltage or frequency fluctuation to the power equipment, and output the load again after the generator generates stable power.

[0005] II. specific technical scheme

[0006] A load intelligent switching device, comprising a generator, the output end of the generator is connected with at least two output units which are the same structure, wherein the first output unit sets up the first output end of the generator, the first output end of the generator is connected with the current detection module U1, the current detection module U2 and the relay switch J1 in series after being connected with the load output end, the voltage detection module L1 is connected in parallel between the first output end of the generator and the current detection module U1, and the isolation photocoupler module IC1 is connected in parallel at both ends of the relay switch J1;Further provided with MCU control module, the input end of the MCU control module is connected with the current detection module U1, the current detection module U2, the voltage detection module L1 and the secondary low voltage output end of the isolation photocoupler module IC1 respectively, and the output end of the MCU control module is connected with the control coil of the relay switch J1.

[0007] The principle of realization, working principle: voltage detection module L1, for detecting the voltage and frequency fluctuation of the generator output, if it exceeds the set value, MCU control module sends control instruction, cut off the load output, current detection module U1 and current detection module U2 detect the power consumption of the electrical equipment exceeds the preset range, will be closed in priority order load equipment, when detecting the user replace load, will again automatically according to priority order to the equipment for power supply; Detection of the current of the electrical equipment is instantaneously large and reaches the level of short circuit, will be closed in priority order load equipment, when detecting the user replace load, will again automatically according to priority order to the equipment for power supply.

[0008] As preferred: the isolation optocoupler module IC1 is provided with an isolation optocoupler U13, the first pin of the input side of the isolation optocoupler U13 is connected with the output end of the current detection module U2 after being connected with the resistor R64, the resistor R65 and the resistor R66 in series, the second pin of the input side of the isolation optocoupler U13 is connected with the load output end of the first output unit; the fourth pin of the output side of the isolation optocoupler U13 is connected with the input end of the MCU control module after passing through the resistor R67, and the pull-up resistor R63 is further connected between the output end and the resistor R67, which stabilizes the optocoupler output level to the power supply VDD; the third pin of the output side of the isolation optocoupler U13 is grounded.

[0009] The optocoupler detection circuit composed of the resistor R64, the resistor R65 and the resistor R66 in series is used for detecting whether the electrical equipment is removed when the relay output is cut off and the optocoupler U13_1_OUT rear end still has the electrical equipment, and the MCU can detect whether the electrical equipment is removed through the signal fed back by the CHECK1_1 pin.

[0010] As preferred: the relay switch J1 is provided with a control coil, one end of the control coil is connected with the control power supply, and the other end is connected with the collector of the triode Q1, the base of the triode Q1 is connected with the control end of the MCU control module after passing through the resistor R30, the resistor R32 is connected between the resistor R30 and the base of the triode Q1, and the emitter of the triode Q1 is grounded. The MCU control module sends control instruction, the triode Q1 is turned on, at this time, the control coil of the relay switch J1 is electrified, the relay switch J1 is actuated, and the cut-off and recovery of the load are realized.

[0011] As preferred: the current detection module U1 and the current detection module U2 are current transformers, and the voltage detection module L1 is a voltage transformer.

[0012] The utility model discloses a beneficial effect is: when the multiple equipment of alternating current generator is connected simultaneously, according to the intelligent switching technology of load of equipment priority level height, when the rated power of generator is limited, the problem of multiple equipment work distribution is solved, and the device has intelligent switching, voltage protection, frequency protection, detects self -restoring function, solves the problem that the generator is under overload after multiple equipment simultaneous operation, and cannot intelligent switching distribution. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structural schematic diagram of the utility model.

[0014] Figure 2 It is the circuit schematic diagram of MCU control module in the utility model.

[0015] Figure 3 It is the circuit schematic diagram of voltage current frequency acquisition calculation part in the utility model.

[0016] Figure 4 It is the circuit schematic diagram of isolation photoelectric coupler U13 in the utility model.

[0017] Figure 5 It is the circuit schematic diagram of relay switch J1 in the utility model. DETAILED DESCRIPTION

[0018] The preferred embodiments of the utility model are described in detail below in combination with the drawings, so that the advantages and characteristics of the utility model can be more easily understood by the person skilled in the art, and the protection scope of the utility model is more clearly and explicitly defined. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.

[0019] As Figure 1 , Figure 2 and Figure 3 Indicated: a load intelligent switching device, including generator, the output end of the generator is connected with three same output units, wherein the first output unit sets up the generator first output end, and the generator first output end is connected in series with current detection module U1, current detection module U2 and relay switch J1 and then serves as load output end, and voltage detection module L1 is connected in parallel between the generator first output end and current detection module U1, and isolation photoelectric module IC1 is connected in parallel at both ends of the relay switch J1.

[0020] Also be provided with MCU control module, and the input end of the MCU control module is connected with the secondary low voltage output end of current detection module U1, current detection module U2, voltage detection module L1 and isolation photoelectric module IC1 respectively, and the output end of the MCU control module is connected with the control coil of relay switch J1.

[0021] As shown in Figure 4: the isolation optical coupling module IC1 is provided with an isolation optical coupler U13, the input side of the isolation optical coupler U13 is connected with the output end of the current detection module U2 after being connected with the resistance R64, the resistance R65 and the resistance R66 in series, the input 2 pin of the isolation optical coupler U13 is connected with the load output end of the first output unit;

[0022] The output 4 pin of the output side of the isolation optical coupler U13 is connected with the input end of the MCU control module after being connected with the resistance R67, the pull-up resistance R63 is further connected between the output end and the resistance R67 to stabilize the optical coupling output level to the power supply VDD; the output 3 pin of the isolation optical coupler U13 is grounded.

[0023] The optical coupling detection circuit is used for detecting whether the electrical equipment is removed or not through the signal feedback of the CHECK1_3 pin when the relay output is cut off and the electrical equipment is still connected to the rear end of the optical coupling L1_3_OUT.

[0024] As shown in Figure 4: the isolation optical coupling module IC1 is provided with an isolation optical coupler U13, the input side of the isolation optical coupler U13 is connected with the output end of the current detection module U2 after being connected with the resistance R64, the resistance R65 and the resistance R66 in series, the input 2 pin of the isolation optical coupler U13 is connected with the load output end of the first output unit; Figure 5 As shown in Figure 4: the isolation optical coupling module IC1 is provided with an isolation optical coupler U13, the input side of the isolation optical coupler U13 is connected with the output end of the current detection module U2 after being connected with the resistance R64, the resistance R65 and the resistance R66 in series, the input 2 pin of the isolation optical coupler U13 is connected with the load output end of the first output unit;

[0025] In the drawings, the voltage collected by L1 is recorded as V_L1, the current collected by L1 is recorded as I_L1, the frequency collected by L1 is recorded as F_L1, the current collected by L1_1 is recorded as I_L1_1, the current collected by L1_3 is recorded as I_L1_3, the voltage collected by L2 is recorded as V_L2, the current collected by L2 is recorded as I_L2, the frequency collected by L2 is recorded as F_L2, the current collected by L2_2 is recorded as I_L2_2, because from the hardware system, the output cut-off and opening of L1 and L2 are not controlled by the switching device, they have the highest priority. But the system detects the voltage, current and frequency information of L1 and L2 through the external current transformer.

[0026] Therefore, the priority is defined as follows:

[0027] L1>L1_1>L1_3;

[0028] L2>L2_2;

[0029] When the system is applied to the field requiring AC power distribution, the following functions are realized:

[0030] 1、Detect the frequency fluctuation, if the frequency fluctuation exceeds the normal frequency range, the priority low L1_1 and L1_3, L2_2 path device will be cut off, and the power supply of the device will be restored after the frequency is normal, thereby protecting the device.

[0031] 2, Detect the voltage fluctuation, if the voltage fluctuation exceeds the normal voltage range, the priority low L1_1 and L1_3, L2_2 path device will be cut off, and the power supply of the device will be restored after the voltage is normal, thereby protecting the device.

[0032] 3, Intelligent switching according to load size, the system can preset the sensitivity of load switching, and simultaneously detects I_L1, I_L2, I_L1_1, I_L1_3, I_L2_2, 5-way current, assuming that our input L1 and L2 can support a maximum of 120V / 30A load per way, after the device, 5 loads are simultaneously connected to the rear end of the device, then according to the priority of the load, the total power is not overloaded, as much as possible to make more loads work, avoid the situation of load overload.

[0033] 4, Short circuit protection, by detecting the size of 5-way current, setting different protection switching levels to realize short circuit protection

[0034] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is limited by the appended claims.

Claims

1. A load intelligent switching device comprising a generator, characterized by: The output end of the generator is connected with at least two output units with same structure, wherein the first output unit is provided with the first output end of the generator, which is connected with a current detection module U1, a current detection module U2 and a relay switch J1 in series to serve as a load output end, a voltage detection module L1 is connected in parallel between the first output end of the generator and the current detection module U1, and an isolation optocoupler module IC1 is connected in parallel across the relay switch J1. An MCU control module is further provided, the input end of which is connected with the current detection module U1, the current detection module U2, the voltage detection module L1 and the secondary low-voltage output end of the isolation optocoupler module IC1 respectively, and the output end of the MCU control module is connected with the control coil of the relay switch J1.

2. The load intelligent switching device of claim 1, wherein: The isolation optocoupler module IC1 is provided with an isolation optocoupler U13, the first pin of the input side of which is connected with the output end of the current detection module U2 after being connected with a resistor R64, a resistor R65 and a resistor R66 in series, and the second pin of the input side of the isolation optocoupler U13 is connected with the load output end of the first output unit. The fourth pin of the output side of the isolation optocoupler U13 is connected with the input end of the MCU control module via a resistor R67, and a pull-up resistor R63 is further connected between the output end and the resistor R67, which stabilizes the optocoupler output level to the power supply VDD; and the third pin of the output side of the isolation optocoupler U13 is grounded.

3. The load intelligent switching device of claim 1, wherein: The relay switch J1 is provided with a control coil, one end of which is connected with a control power supply, and the other end of which is connected with the collector of a triode Q1, the base of which is connected with the control end of the MCU control module via a resistor R30, and a resistor R32 is connected between the resistor R30 and the base of the triode Q1, and the emitter of the triode Q1 is grounded.

4. The load intelligent switching device of claim 1, wherein: The current detection module U1 and the current detection module U2 are current transformers, and the voltage detection module L1 is a voltage transformer.

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