CN201252490Y

CN201252490Y - Direct current power-supply circuit

Info

Publication number: CN201252490Y
Application number: CNU2008201526512U
Authority: CN
Inventors: 周文华
Original assignee: SHANGHAI SUNRISE POWER AUTOMATION CO Ltd
Current assignee: SHANGHAI SUNRISE POWER AUTOMATION CO Ltd
Priority date: 2008-09-03
Filing date: 2008-09-03
Publication date: 2009-06-03
Anticipated expiration: 2018-09-03

Abstract

The utility model relates to a direct current power-supply circuit relating to the technical field of power supply, which solves the technical problem that an existing direct current power-supply circuit built in an instrumental device can not supply stable and reliable direct current power supply for semaphore relative to the instrumental device. The circuit comprises a rectification unit, an over-current detecting unit and an over-voltage detecting unit which are orderly connected, the direct current power-supply circuit is characterized in that the rectification unit comprises two groups of rectification return circuits which are connected in parallel, wherein the direct current output ends of each group of the rectification return circuits are provided with rectification return circuit output indicating circuits, the over-current detecting unit is connected with a mechanism stuck indicating circuit in parallel, the over-voltage detecting unit comprises an over-voltage relay and a return voltage modification return circuit, wherein a normally-close contact switch of the over-voltage relay is connected with the output of the over-current detecting unit, a normally-open switch thereof is connected with the return voltage modification return circuit, and the direct current output end of the over-voltage relay is provided with the direct current output indicating circuit. The direct current power-supply circuit provided by the utility model has higher reliability.

Description

Direct-current power supply circuit

Technical field

The utility model relates to power supply supply technology, particularly relates to a kind of technology that is used for the direct-current power supply circuit of instrument and equipment.

Background technology

Occasions such as electrical control center such as most of transformer stations, power plant all are provided with the various devices that are used for the protection and the monitoring of equipment; these devices generally all use direct current supply; yet, there are a lot of control centres not have the direct-current power supply facility in view of scale and cost reason.

Therefore a lot of manufacturers are when the exploitation instrument and equipment, all ac-dc converter circuit is integrated in instrument and equipment inside, think that this instrument and equipment provides DC power supply, yet a lot of semaphores relevant with instrument and equipment are (as remote signalling, indicator light etc.) also need DC power supply, if using the built-in ac-dc converter circuit of instrument and equipment is its power supply, because sort circuit only provides one tunnel input, can't insert emergency power supply again, thereby its power supply input reliability is relatively poor, and can't monitor its output voltage, electric current, the operations staff also can't understand its operating state in real time, and reliability is not high.

The utility model content

At the defective that exists in the above-mentioned prior art, technical problem to be solved in the utility model provides a kind of, can be for semaphores such as remote signalling, indicator light etc. provide reliable and stable DC power supply, and can monitor the direct-current power supply circuit that is used for instrument and equipment of its operating state.

In order to solve the problems of the technologies described above, a kind of direct-current power supply circuit provided by the utility model, comprise the rectification unit, over-current detection unit, the overvoltage detecting unit that connect successively, it is characterized in that: described rectification unit is made up of the commutating circuit of two groups of parallel connections, and the dc output end of every group of commutating circuit is provided with commutating circuit output indicating circuit; Described over-current detection unit is parallel with mechanism blockage indicating circuit; Described overvoltage detecting unit is adjusted the loop by overvoltage relay, return voltage and is formed, the moving disconnection connection of described overvoltage relay is taken over the output of stream detecting unit, its moving running jointly is closed connection return voltage adjustment loop, and the dc output end of described overvoltage relay is provided with direct current output indicating circuit.

Further, described return voltage is adjusted the loop and is comprised shunt circuit and bleeder circuit, and can adjust the return voltage of overvoltage relay by the resistance in adjustment shunt circuit and the bleeder circuit.

The direct-current power supply circuit that the utility model provides because the commutating circuit of two groups of parallel connections can provide two groups of civil powers to insert, therefore can improve power supply input reliability; Also be respectively equipped with the indicating circuit that is used to indicate its operating state in each unit, make output voltage, electric current to be monitored, the operations staff only needs can judge the loop works state by indicator light that its reliability is higher.

Description of drawings

Fig. 1 is the circuit diagram of the direct-current power supply circuit of the utility model embodiment;

Fig. 2 is the circuit diagram that two groups of commutating circuits of the utility model embodiment are exported indicating circuit and direct current output indicating circuit;

Fig. 3 is the circuit diagram of the mechanism blockage indicating circuit of the utility model embodiment.

Embodiment

Below in conjunction with description of drawings embodiment of the present utility model is described in further detail, but present embodiment is not limited to the utility model, every employing analog structure of the present utility model and similar variation thereof all should be listed protection range of the present utility model in.

As shown in Figure 1 and Figure 2, a kind of direct-current power supply circuit that the utility model embodiment is provided, comprise the rectification unit 1, over-current detection unit 2, the overvoltage detecting unit 3 that connect successively, it is characterized in that: described rectification unit 1 is made up of the single-phase bridge rectification loop of two groups of parallel connections, and the dc output end of every group of commutating circuit is provided with commutating circuit output indicating circuit; Described over-current detection unit 2 is made up of thermistor RT1, the RT2 of two series connection, and is parallel with mechanism blockage indicating circuit; Described overvoltage detecting unit 3 is adjusted the loop by overvoltage relay JD1, return voltage and is formed, the moving disconnection connection of described overvoltage relay JD1 is taken over the output of stream detecting unit 2, its moving running jointly is closed connection return voltage adjustment loop, and the dc output end of described overvoltage relay JD1 is provided with direct current output indicating circuit.

In described two groups of commutating circuits, first commutating circuit comprises the diode D1 to D4 of four bridge joints, is connected to wave resistance between its alternating current input ACL1, ACN1 and gushes resistance R V1, and second commutating circuit is identical with the first commutating circuit structure.

Described return voltage is adjusted the loop and is comprised the shunt circuit of being made up of resistance R 13, R14, the bleeder circuit of forming by resistance R 15, R16, and can adjust overvoltage relay JD1 return voltage by the value of adjustment R13, R14, R15, R16.

The model of described overvoltage relay JD1 is DSP1-DC24V.

During work, the alternating current input of two groups of commutating circuits inserts two groups of civil powers respectively, the indicator light of corresponding commutating circuit output indicating circuit is lighted in two groups of commutating circuits, civil power is converted to Rectified alternating current with alternating current after the commutating circuit rectification, be transported to overvoltage relay JD1 through the overcurrent detecting unit again, the indicator light of mechanism blockage indicating circuit is for extinguishing state at this moment, the moving disconnection of overvoltage relay JD1 is closed closed and moving running jointly and is closed disconnection under the normal condition, the direct current output indicator is lighted simultaneously, and power supply normally exports load to through overvoltage relay JD1.

When the normal and load of output voltage is heavier, loop current increases, output loop is disconnected after loop current is greater than thermistor overcurrent limit value, and the electric capacity of commutating circuit output is in discharge condition, and the indicator light of mechanism blockage indicating circuit is lighted gradually simultaneously.

When the normal and output voltage of output loading is higher than overvoltage relay JD1 limit value, the moving disconnection of overvoltage relay JD1 is closed and is disconnected, its moving running jointly is closed closure simultaneously, thereby output voltage and current supply circuit are disconnected, provide power supply to make overvoltage relay JD1 remain on operate condition by electric capacity to overvoltage relay JD1 this moment, return voltage is adjusted loop works simultaneously, and overvoltage indicator light L5 is also lighted.

Claims

1, a kind of direct-current power supply circuit, comprise the rectification unit, over-current detection unit, the overvoltage detecting unit that connect successively, it is characterized in that: described rectification unit is made up of the commutating circuit of two groups of parallel connections, and the dc output end of every group of commutating circuit is provided with commutating circuit output indicating circuit; Described over-current detection unit is parallel with mechanism blockage indicating circuit; Described overvoltage detecting unit is adjusted the loop by overvoltage relay, return voltage and is formed, the moving disconnection connection of described overvoltage relay is taken over the output of stream detecting unit, its moving running jointly is closed connection return voltage adjustment loop, and the dc output end of described overvoltage relay is provided with direct current output indicating circuit.

2, direct-current power supply circuit according to claim 1, it is characterized in that: described return voltage is adjusted the loop and is comprised shunt circuit and bleeder circuit, and can adjust the return voltage of overvoltage relay by the resistance in adjustment shunt circuit and the bleeder circuit.