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Load starting circuit

A starting circuit and starting device technology, applied in the direction of protection against undervoltage or no voltage, can solve the problems of high cost, low reliability, and complex structure of load classification starting circuit, and achieve low cost and high reliability , the effect of simple structure

Active Publication Date: 2015-03-18
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of the load classification startup circuit is relatively complicated, the cost is high, and software control is required, and the reliability is low

Method used

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Examples

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Embodiment 1

[0038] This embodiment provides a load starting circuit for starting a load L under the action of a power supply P. The structure of the load starting circuit is as Figure 4 As shown, it includes a current limiting unit 11 , a switching unit 12 , an energy storage unit 13 and an undervoltage detection and control unit 14 .

[0039] The energy storage unit 13 is connected in parallel with the load L, and is connected in series with the current limiting unit 11 between the positive and negative poles of the power supply P after the parallel connection. The energy storage unit 13 is composed of a capacitor.

[0040] The switch unit 12 is located between the load L and the current limiting unit 11, and includes a PMOS transistor and a resistor R4. The source and drain of the PMOS transistor are respectively connected to the current limiting unit 11 and the load L, for connecting the load L to the current limiting The unit 11 is disconnected or disconnected from the current limit...

Embodiment 2

[0045] The load starting circuit provided by the present invention may also not have a current limiting unit. For example, for some power supplies, in order to avoid voltage drop, a current limiting unit is integrated inside the power supply. For this kind of power supply, the current limiting unit can be omitted in the load starting circuit provided by the present invention. For another example, for some power supplies, it exhibits the characteristic of "current limit" to the outside, that is, when the current reaches a certain upper threshold, the current is limited to prevent voltage drop. For this kind of power supply, the current limiting unit can also be omitted in the load starting circuit provided by the present invention.

[0046] Therefore, for this kind of power supply, the present embodiment provides a load starting circuit without a current limiting unit, which can avoid the situation that the load cannot be started due to insufficient current. The structure of ...

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PUM

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Abstract

The invention provides a load starting circuit. The load starting circuit comprises an input end, an output end, an energy storage unit, a switch unit and an under-voltage detection and control unit, wherein the input end comprises an input end anode and an input end cathode and is used for receiving electric energy from a power supply; the output end comprises an output end anode and an output end cathode and is used for supplying the electric energy to a load; the energy storage unit is connected between the input end anode and the input end cathode and is used for supplying the electric energy to the output end anode and the output end cathode; the switch unit is used for controlling the output end to supply or not supply the electric energy to the load; the under-voltage detection and control unit is used for detecting energy in the energy storage unit and controlling the switch-off or switch-on of the switch unit according to a detection result. According to the load starting circuit provided by the invention, the load can normally work and does not need to be started in a classification mode.

Description

technical field [0001] The invention relates to a load starting circuit, in particular to a load starting circuit which does not require load classification starting. Background technique [0002] For a load connected to a DC voltage source, the maximum power of the load should be equal to or less than the maximum power of the power supply. However, the power of the startup process of some loads may exceed the maximum power of the power supply. In this way, the output voltage of the power supply will decrease. For some loads (such as digital chips), this voltage drop can cause component failure (such as failure to start) or even damage. In this case, the load cannot be started normally. [0003] Currently, common load starting circuits include a current limiting unit (such as figure 1 shown) to limit the load current beyond a certain threshold, thereby avoiding voltage sags. However, this circuit does not take into account the type of load whose starting current is grea...

Claims

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Application Information

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IPC IPC(8): H02H3/24
Inventor 徐首旗卢向东
Owner SIEMENS AG