CN215990308U

CN215990308U - Switching device of alternating current dual power supply

Info

Publication number: CN215990308U
Application number: CN202122101373.6U
Authority: CN
Inventors: 张德祥
Original assignee: Zhuhai Wharton Intelligent Information Technology Co ltd
Current assignee: Zhuhai Wharton Intelligent Information Technology Co ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2022-03-08
Anticipated expiration: 2031-09-02

Abstract

The utility model aims to provide an alternating current double-power switching device which can realize quick switching and is stable in power supply. The dual-power-supply voltage-boosting device comprises a power transmission module, a processing module and a voltage-reducing module, wherein the power transmission module is in electric signal connection with the processing module through a voltage transformer, the power transmission module supplies power to the processing module through the voltage-reducing module, the processing module is electrically connected with a delay relay, information acquired by the delay relay is fed back to the power transmission module, the voltage transformer isolates, samples, boosts and compares voltage signals of the power transmission module, converts the voltage signals into pulse signals of 50HZ and provides the pulse signals to a control chip, and the switching of dual power supplies and the judgment of priority sequence are driven according to the existence of two paths of pulse signals and the time of signal disappearance. The utility model is applied to the technical field of power switching.

Description

Switching device of alternating current dual power supply

Technical Field

The utility model is applied to the technical field of power switching, and particularly relates to a switching device of an alternating-current dual power supply.

Background

The existence of human daily life without power supply, especially in important departments requiring continuous power generation such as post and telecommunications communication, banks, hospitals, fire departments, high-rise buildings, industrial pipelines, television stations and the like, if power grid transmission fails and power supply cannot be timely provided, huge economic loss and potential safety hazards are brought, and therefore a standby power supply is added to a load circuit to serve as an emergency power supply so as to ensure continuous and reliable operation of important loads. When the power supply works, the three-phase voltages of two power supplies need to be tested regularly, and faults such as over-voltage, under-voltage and power failure of any phase can be converted into a normal power supply from the side of the normal power supply in a delayed mode, so that the continuity and safety of power supply are guaranteed. Therefore, it is necessary to provide an ac dual power switching device that realizes fast switching and stable power supply.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides the alternating current dual power supply switching device which realizes quick switching and has stable power supply.

The technical scheme adopted by the utility model is as follows: the power transmission module is in electric signal connection with the processing module through a voltage transformer, the voltage reduction module is connected with a low-voltage direct-current power supply and supplies power to the processing module, the processing module is electrically connected with a solid-state relay, the power transmission module comprises a main power supply and a secondary power supply, and the processing module controls the on-off of the main power supply and the secondary power supply through the solid-state relay.

According to the scheme, the low-voltage direct-current power supply 24V is subjected to voltage reduction by the voltage reduction module to obtain 5V voltage, and the 5V voltage is respectively supplied to the processing module and the voltage division reference module. The power transmission module comprises a main power supply and a secondary power supply, when the power transmission module detects that the main power supply loop is electrified, no matter whether the secondary power supply loop is electrified or not, the main power supply loop is preferentially switched to a power circuit, only when the main power supply loop is not electrified, the secondary power supply loop is switched to, the voltage transformer converts a voltage signal of the power transmission module into a rated pulse signal, and the processing module judges whether each phase voltage exists or not. When the last pulse of a certain path appears and no pulse appears after 20ms, the loop is considered to be power-off, and if the secondary power supply is power-off, the loop is not changed; if the main power supply loop loses power, the switch-on switch of the main power supply is disconnected, and the switch of the secondary power supply loop is driven to be switched on after 20ms interval; if the signal of the secondary power supply loop is firstly transmitted and the signal of the main power supply loop is further transmitted, the switch of the secondary power supply loop is firstly disconnected, and the switch of the main power supply loop is closed after 20 ms.

Preferably, the processing module comprises a processing chip with the model number HC32F003C4 PA.

As can be seen from the above scheme, the circuit adopts a processing chip with HC32F003C4PA of 20PIN and the reference voltage of 5V.

Preferably, the voltage transformer includes a current-type voltage transformer, and the current-type voltage transformer converts an input voltage signal in the power transmission module into a pulse signal and sends the pulse signal to the processing module.

According to the scheme, the current type voltage transformer isolates and samples the voltage signal of the power transmission module, the reference voltage raising is carried out through the operational amplifier, the voltage signal is compared and converted into a pulse signal of 50HZ and provided for the processing module control chip, and the switching of the double power supplies and the priority order judgment are driven according to the existence of the two paths of pulse signals and the time of signal disappearance.

Preferably, the voltage reduction module comprises a power supply chip with the model number of L7805 ABV-DG.

Preferably, the voltage reduction module is connected with the voltage transformer through a voltage division reference module and provides a reference voltage.

According to the scheme, the voltage of the low-voltage direct-current power supply 24V is reduced by the voltage reduction module to obtain 5V voltage, and the 5V voltage is respectively supplied to the processing module control chip and the voltage division reference module to carry out reference voltage lifting.

Preferably, the processing module controls the solid-state relay through a relay driving module.

According to the scheme, the relay driving module takes 24V as the driving module of the solid-state relay, so that the solid-state relay has the characteristics of reverse-filling prevention protection and overvoltage protection, the solid-state relay has the characteristics of high sensitivity, small control power and good electromagnetic compatibility, the input voltage range of the solid-state relay is wide, the driving power is low, the solid-state relay can be compatible with most logic integrated circuits, a buffer or a driver does not need to be added, and meanwhile, the solid-state relay adopts a solid device, so that the switching speed reaches several milliseconds.

Drawings

FIG. 1 is an overall block diagram of the present invention;

FIG. 2 is a circuit schematic of the processing module;

FIG. 3 is a circuit schematic of the voltage reduction module;

FIG. 4 is a circuit schematic of the voltage transformer;

FIG. 5 is a schematic diagram of a control circuit of the solid state relay;

fig. 6 is a circuit schematic of the voltage divider reference block.

Detailed Description

As shown in fig. 1 to 6, in this embodiment, the present invention includes a power transmission module 1, a processing module 2, and a voltage reduction module 3, where the power transmission module 1 is electrically connected to the processing module 2 through a voltage transformer 4, the voltage reduction module 3 is connected to a low-voltage dc power supply 5 and supplies power to the processing module 2, the processing module 2 is electrically connected to a solid-state relay 6, the power transmission module 1 includes a primary power source and a secondary power source, and the processing module 2 controls on/off of the primary power source and the secondary power source through the solid-state relay 6.

In the present embodiment, the processing module 2 includes a processing chip of model HC32F003C4 PA.

In this embodiment, the voltage transformer 4 includes a current-type voltage transformer, the current-type voltage transformer converts the input voltage signal in the power transmission module 1 into a pulse signal and gives the processing module 2, the current-type voltage transformer includes a first operational amplifier, a first inductance coil connected with the power transmission module 1 and a second inductance coil connected with the first operational amplifier, two ends of the second inductance coil are respectively connected with the 5 th pin and the 2 nd pin of the first operational amplifier, and the output end of the first operational amplifier is connected with the IO port of the processing module 2.

In this embodiment, the voltage-reducing module 3 includes a power chip with a model number of L7805 ABV-DG.

In this embodiment, the voltage-reducing module 3 is connected to the voltage transformer 4 through a voltage-dividing reference module 7 and provides a reference voltage, the voltage-dividing reference module 7 includes a second operational amplifier, a positive input end of the second operational amplifier is connected to an output end of the voltage-reducing module 3, a negative input end of the second operational amplifier is connected to an output end of the second operational amplifier, and an output end of the second operational amplifier is simultaneously connected to the 2 nd pin of the first operational amplifier and one end of the second inductor coil.

In the present embodiment, the processing module 2 controls the solid-state relay 6 through a relay driving module.

The working principle of the utility model is as follows: when the main power supply loop is detected to be electrified, no matter the secondary power supply loop is electrified or not electrified, the main power supply loop is preferentially switched to a power utilization circuit, only when the main power supply loop is not electrified, the main power supply loop is switched to the secondary power supply loop, the voltage transformer converts the voltage signal of the power transmission module into a rated pulse signal, and the processing module judges whether each phase voltage exists or not. When the last pulse of a certain path appears and no pulse appears after 20ms, the loop is considered to be power-off, and if the secondary power supply is power-off, the loop is not changed; if the main power supply loop loses power, the switch-on switch of the main power supply is disconnected, and the switch of the secondary power supply loop is driven to be switched on after 20ms interval; if the signal of the secondary power supply loop is firstly transmitted and the signal of the main power supply loop is further transmitted, the switch of the secondary power supply loop is firstly disconnected, and the switch of the main power supply loop is closed after 20 ms.

Claims

1. The utility model provides a switching device of alternating current dual supply which characterized in that: it includes transmission of electricity module (1), processing module (2) and step-down module (3), transmission of electricity module (1) pass through voltage transformer (4) with processing module (2) signal of telecommunication is connected, step-down module (3) are connected and supply power with low pressure DC power supply (5) give processing module (2), processing module (2) and solid state relay (6) electric connection, transmission of electricity module (1) includes main power source and time power source, processing module (2) pass through solid state relay (6) control the break-make of main power source and time power source.

2. The switching device of an alternating current dual power supply according to claim 1, wherein: the processing module (2) comprises a processing chip with the model number HC32F003C4 PA.

3. The switching device of an alternating current dual power supply according to claim 1, wherein: the voltage transformer (4) comprises a current type voltage transformer, and the current type voltage transformer converts an input voltage signal in the power transmission module (1) into a pulse signal and sends the pulse signal to the processing module (2).

4. The switching device of an alternating current dual power supply according to claim 1, wherein: the voltage reduction module (3) comprises a power supply chip with the model of L7805 ABV-DG.

5. The switching device of an alternating current dual power supply according to claim 1, wherein: the voltage reduction module (3) is connected with the voltage transformer (4) through a voltage division reference module (7) and provides reference voltage.

6. The switching device of an alternating current dual power supply according to claim 1, wherein: the processing module (2) controls the solid-state relay (6) through the relay driving module.