Double-path direct-current power supply switching device

Abstract

The utility model relates to the technical field of power supply switching, and discloses a double-path direct current power supply switching device, which comprises a main direct current power supply, a standby direct current power supply, a double-path power supply switching module and a state detection module, the main direct current power supply and the standby direct current power supply are connected in parallel to the double-path power supply switching module, and an output circuit of the double-path power supply switching module is connected with load equipment; the state detection module is electrically connected with the double-circuit power supply switching module, and is used for collecting input current signals of the main DC power supply and the standby DC power supply, controlling the double-circuit power supply switching module to be communicated with at most one circuit of power supply, and transmitting the signals to load equipment. The switching circuit is short in switching time delay, small in size and small in switching voltage fluctuation, and ensures normal operation of load equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply switching technical field especially relates to a dual -circuit direct current power supply switching device. BACKGROUND

[0002] At present, dual -circuit direct current power supply exists switching delay under the condition of single -circuit power failure, and in the process of dual -circuit switching, the entire power supply system appears larger voltage fluctuation, thereby leading to the abnormal situation of electrical equipment, especially in the case of large -current dual -circuit direct current power supply and some important equipment, and the abnormal voltage of equipment can lead to serious consequences. SUMMARY

[0003] Therefore, the utility model provides a dual -circuit direct current power supply switching device, and switching delay is short, and the volume is small, and switching voltage fluctuation is small, and the normal work of load equipment is ensured.

[0004] The utility model discloses a dual -circuit direct current power supply switching device, including main direct current power supply and spare direct current power supply, dual -circuit power supply switching module, state detection module, main direct current power supply and spare direct current power supply are connected in parallel and access dual -circuit power supply switching module, and dual -circuit power supply switching module output circuit connects load equipment;State detection module is electric with dual -circuit power supply switching module, is used to gather the input current signal of main direct current power supply and spare direct current power supply and controls dual -circuit power supply switching module to be connected with at least one power supply communication, and is transported to load equipment.

[0005] Further, it further includes voltage fluctuation suppression module, and voltage fluctuation suppression module is connected in series on the connecting circuit of dual -circuit power supply switching module and load equipment;State detection module is connected with voltage fluctuation suppression module output circuit, is used to gather output current signal and output voltage signal, compares input current signal, output current signal, output voltage signal with threshold value, and when exceeding threshold value, controls dual -circuit power supply switching module to disconnect two power supply and sends out alarm signal.

[0006] Further, dual -circuit power supply switching module includes current sensor I, current sensor II, relay I, relay II and diode group, and main direct current power supply and spare direct current power supply are connected in parallel and access diode group, and diode group is connected with voltage fluctuation suppression module;Current sensor I and relay I are connected in series on the parallel circuit of main direct current power supply in proper order, and current sensor II and relay II are connected in series on the parallel circuit of spare direct current power supply in proper order;Current sensor I and current sensor II send their input current signals to state monitoring module respectively;Relay I and relay II are controlled to open and close by state monitoring module respectively, and the opening and closing of relay I and relay II correspond to whether main direct current power supply and spare direct current power supply are connected with diode group respectively.

[0007] Further, voltage fluctuation suppression module is the circuit that is formed by voltage-dependent resistor and capacitor.

[0008] Further, the state monitoring module is provided with a serial port for transmitting the input current signal, the output current signal and the output voltage signal to a displayable device.

[0009] Compared with the prior art, the utility model has the beneficial effects that:

[0010] 1. The state detection module according to the utility model can rapidly respond to the input current signal of the main direct current power supply and the backup direct current power supply and control the double-path power supply switching module, at most selects one path of power supply communication and transports to the load device; the overall device has simple structure, small land occupation, short time delay and small voltage fluctuation, and can avoid damage of the load device caused by abnormal current and voltage in real time.

[0011] 2. The voltage fluctuation suppression module of the utility model can further prevent power supply instability caused by excessive voltage fluctuation and voltage fluctuation generated during double-path switching.

[0012] 3. The two current sensors of the utility model can monitor the input current and send the input current to the state detection module in real time, control the opening and closing of the two relays, and when one path loses power, the other path can realize power supply in milliseconds; meanwhile, the diode group can further ensure the stability of the voltage. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic diagram of the utility model principle. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0015] The utility model provides a kind of double-path direct current power supply switching device, as shown in Figure 1 The device includes double-path power supply, double-path power supply switching module, state detection module and voltage fluctuation suppression module. Double-path power supply is main direct current power supply and backup direct current power supply respectively, and both are connected in parallel into double-path power supply switching module, and the output circuit of double-path power supply switching module is connected to load device;Voltage fluctuation suppression module is connected in series on the connecting circuit of double-path power supply switching module and load device.

[0016] The state detection module is electrically connected with the dual power supply switching module, is used for collecting input current signals of the main direct current power supply and the backup direct current power supply and sending control signals to the dual power supply switching module; and controls the dual power supply switching module to be connected with at most one power supply and to deliver power to the load device. Specifically, in the normal power supply condition, the main direct current power supply supplies power to the load device; in the main direct current power supply outage condition, the state detection module cannot detect the input current signal of the main direct current power supply, and controls the dual power supply switching module to be connected with the backup direct current power supply.

[0017] Further, the state detection module is connected with an output circuit of the voltage fluctuation suppression module, is used for collecting output current signals and output voltage signals, and compares the input current signals, the output current signals and the output voltage signals with preset threshold values; when the threshold values are exceeded, the state detection module controls the dual power supply switching module to disconnect the dual power supply and sends an alarm signal.

[0018] In the embodiment, the state monitoring module adopts a domestic Megui Innovation GD32 master control chip and a domestic analog-digital conversion chip to process the collected signal data; if the set threshold value is exceeded, an alarm signal can be sent and an automatic disconnection signal can be sent to the front-stage dual power supply switching module, so that the power supply is disconnected in time to protect the safety of the electrical equipment.

[0019] The dual power supply switching module comprises a current sensor I, a current sensor II, a relay I, a relay II and a diode group. The main direct current power supply and the backup direct current power supply are connected in parallel to the diode group, and the diode group is connected with the voltage fluctuation suppression module. The current sensor I and the relay I are connected in series on the parallel circuit of the main direct current power supply, and the current sensor II and the relay II are connected in series on the parallel circuit of the backup direct current power supply. The current sensor I and the current sensor II respectively send input current signals to the state monitoring module, and the relay I and the relay II respectively receive control signals from the state monitoring module to control the opening and closing states of the relay I and the relay II. The opening and closing states of the relay I and the relay II correspond to whether the main direct current power supply and the backup direct current power supply are connected with the diode group. In addition, the two current sensors monitor the input current in real time and send the input current to the state monitoring module, so that the power supply can be disconnected in time according to the set program when the current is too large, thereby protecting the safety of the circuit.

[0020] In the normal power supply condition, the relay I is attracted, and the main direct current power supply circuit supplies power. When the main direct current power supply is powered off, the state monitoring module controls the backup relay II to be attracted, thereby realizing seamless switching of the dual power supply. The state monitoring module can be provided with a mode control button and a manual switching button. The mode control button can realize manual mode or automatic mode of the state monitoring module. The manual switching button realizes switching and connection of the dual circuit in the manual mode. In the automatic mode, when one power supply is powered off, the other power supply can realize power supply in milliseconds.

[0021] The voltage fluctuation suppression module is a circuit composed of a voltage-dependent resistor and a capacitor, which can ensure the stability of the subsequent output voltage, thereby protecting the subsequent circuit. The voltage-dependent resistor can clamp the voltage at a certain fixed value when the circuit has a large fluctuation, preventing excessive voltage from impacting the subsequent circuit. The charging and discharging of the capacitor can stabilize the fluctuation, making the voltage more stable. The voltage fluctuation suppression module can effectively stabilize the voltage fluctuation caused by switching and other sudden voltage fluctuations.

[0022] The state monitoring module reserves a serial port, and according to actual use requirements, relevant voltage and current data (input current signal, output current signal, output voltage signal) can be transmitted to a display device, thereby realizing real-time monitoring of the voltage and current.

[0023] The utility model discloses a double -way power supply one way appears the situation of power failure, and another way can guarantee power supply normal power supply in time, ensure normal work of equipment;Effectively reduce the equipment failure risk that voltage sharp fluctuation leads to when power supply line switching.

[0024] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A dual DC power supply switching device, characterized by, The double-path direct current power supply switching device comprises a main direct current power supply, a backup direct current power supply, a double-path power supply switching module and a state detection module. The state detection module is electrically connected with the double-path power supply switching module, and is configured to collect input current signals of the main direct current power supply and the backup direct current power supply, control the double-path power supply switching module to be connected with at most one power supply, and deliver the power supply to the load device. The double-path direct current power supply switching device further comprises a voltage fluctuation suppression module, which is connected in series with the double-path power supply switching module and the load device. The state detection module is connected with an output circuit of the voltage fluctuation suppression module, and is configured to collect output current signals and output voltage signals, compare the input current signals, the output current signals and the output voltage signals with threshold values, and control the double-path power supply switching module to be disconnected from the two power supplies and send an alarm signal when the threshold values are exceeded.

2. The dual DC power supply switching device of claim 1, wherein, The double-path power supply switching module comprises a current sensor I, a current sensor II, a relay I, a relay II and a diode group. The current sensor I and the relay I are connected in series on a parallel circuit of the main direct current power supply, and the current sensor II and the relay II are connected in series on a parallel circuit of the backup direct current power supply.

3. The dual DC power supply switching device of claim 2, wherein, The current sensor I and the current sensor II respectively send input current signals to the state monitoring module.

4. The dual DC power supply switching device of any one of claims 1-3, wherein, The relay I and the relay II are respectively controlled by the state monitoring module to be opened and closed, and the opening and closing of the relay I and the relay II correspond to whether the main direct current power supply and the backup direct current power supply are connected with the diode group. The voltage fluctuation suppression module is a circuit composed of a voltage-dependent resistor and a capacitor. The state monitoring module is provided with a serial port, and is configured to transmit the input current signals, the output current signals and the output voltage signals to a displayable device.

Images