CN217769865U

CN217769865U - Power output bleeder protection circuit

Info

Publication number: CN217769865U
Application number: CN202221314753.6U
Authority: CN
Inventors: 刘星光; 王驰宇
Original assignee: Shenzhen Faithtech Co ltd
Current assignee: Shenzhen Faithtech Co ltd
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2022-11-08
Anticipated expiration: 2032-05-27

Abstract

The utility model discloses a power output protection circuit that releases relates to power output protection technical field that releases, now proposes following scheme: including power, load, comparison circuit, delay circuit and bleeder circuit, the positive output of power respectively with the anodal input of load and bleeder circuit electric connection, the negative pole output of power respectively with the negative pole input of load and bleeder circuit electric connection, the power respectively with comparison circuit's input, delay circuit's input and bleeder circuit electric connection, and comparison circuit's output electric connection has triode Q3's collecting electrode and bleeder circuit's input, triode Q3's base and delay circuit's output electric connection, triode Q3's emitter ground connection. The utility model discloses can judge whether the load is source class load, and after the power is closed, bleeder circuit closes.

Description

Power output bleeder protection circuit

Technical Field

The utility model relates to a power output protection technical field that releases especially relates to a power output protection circuit that releases.

Background

When the power output is closed, if a large capacitor is arranged on an output line, the voltage on a load circuit is slowly reduced, and the load circuit cannot be normally reset and started, so that a bleeder circuit needs to be added, the output voltage is quickly reduced when the power output is closed, but when the load is an active load such as a battery, the power output is closed, the bleeder circuit always works, the bleeder circuit is damaged, and meanwhile, the energy of the active load is continuously consumed, under many conditions, the state is not allowed, and therefore the power output bleeder protection circuit is provided.

SUMMERY OF THE UTILITY MODEL

Objects of the invention

In view of this, an object of the present invention is to provide a power output leakage protection circuit to solve the problems existing in the prior art.

(II) technical scheme

In order to achieve the technical purpose, the utility model provides a power output bleeder protection circuit, including power, load, comparison circuit, delay circuit and bleeder circuit, the anodal output of power respectively with the anodal input of load and bleeder circuit electric connection, the negative pole output of power respectively with the negative pole input of load and bleeder circuit electric connection, the power respectively with comparison circuit's input, delay circuit's input and bleeder circuit electric connection, and comparison circuit's output electric connection has triode Q3's collecting electrode and bleeder circuit's input, triode Q3's base and delay circuit's output electric connection, triode Q3's projecting pole ground connection.

Preferably, the bleeder circuit includes triode Q2, triode Q1 and resistance R, triode Q2's base and triode Q3's collecting electrode electric connection, triode Q2's projecting pole ground connection, triode Q2's collecting electrode electric connection has power and diode Q1's base, diode Q1's projecting pole ground connection, triode Q1's collecting electrode and resistance R's one end electric connection, resistance R's the other end and the negative pole output electric connection of power.

Preferably, the comparison circuit is configured to compare a voltage provided by the power supply with a set voltage Vref of the comparison circuit, and the comparison circuit determines whether the load is a source load by outputting a high level or a low level.

Preferably, the delay circuit is configured to delay the voltage provided by the power supply, and compare the delayed voltage provided by the power supply with its own set voltage Vref.

Compared with the prior art, the beneficial effects of the utility model are that:

according to the technical scheme, whether the load is a source load or not can be judged, and the bleeder circuit is closed after the power supply is closed.

Drawings

Fig. 1 is a circuit diagram schematically showing a power output leakage protection circuit according to the present invention.

Detailed Description

The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, identical or similar reference numerals indicate identical or similar parts and features. The drawings are only schematic representations of the concepts and principles of embodiments of the disclosure, and do not necessarily show specific dimensions and proportions of the various embodiments of the disclosure. Certain features and embodiments of the disclosure may be shown in exaggerated form in particular drawings to illustrate relevant details or structures of embodiments of the disclosure.

Fig. 1 is a power output bleeder protection circuit according to an exemplary embodiment of the present invention, which comprises a power supply, a load, a comparison circuit, a delay circuit and a bleeder circuit, wherein the positive output terminal of the power supply is electrically connected to the positive input terminal and the bleeder circuit of the load, the negative output terminal of the power supply is electrically connected to the negative input terminal and the bleeder circuit of the load, the power supply is electrically connected to the input terminal of the comparison circuit, the input terminal of the delay circuit and the bleeder circuit, the output terminal of the comparison circuit is electrically connected to the collector of a transistor Q3 and the input terminal of the bleeder circuit, the comparison circuit is used for comparing the voltage provided by the power supply with the set voltage Vref of the comparison circuit, the comparison circuit judges whether the load is a source load by outputting a high level or a low level, the base of the transistor Q3 is electrically connected to the output terminal of the delay circuit, the emitter of the transistor Q3 is grounded, the delay circuit is used for delaying the voltage provided by the power supply, and comparing the voltage provided by the power supply after the delay with the set voltage Vref of the power supply after the delay;

bleeder circuit includes triode Q2, triode Q1 and resistance R, triode Q2's base and triode Q3's collecting electrode electric connection, triode Q2's projecting pole ground connection, triode Q2's collecting electrode electric connection has power and diode Q1's base, diode Q1's projecting pole ground connection, triode Q1's collecting electrode and resistance R's one end electric connection, resistance R's the other end and the negative pole output electric connection of power, the utility model discloses can judge whether the load is source class load, and after the power is closed, bleeder circuit closes.

According to the utility model discloses a power output protection circuit that releases can realize judging whether the load is source class load, and after the power was closed, the release circuit was closed. Specifically, when the power supply is turned off during use, the comparison circuit, the delay circuit and the bleeder circuit work, the comparison circuit is used for comparing the voltage provided by the power supply with the set voltage Vref of the comparison circuit, the comparison circuit judges whether the load is a source load or not by outputting a high level or a low level, the bleeder circuit presents a low impedance, if the load is a non-source load, the output voltage of the power output end starts to rapidly drop, before the delay time of the delay circuit is not finished, the output voltage of the power output end is already reduced to be lower than the set voltage Vref of the comparison circuit, the comparison circuit turns over, after the delay time of the delay circuit is finished, the output level of the comparison circuit does not influence the bleeder circuit, and the bleeder circuit continues to work; on the contrary, if the load is a source load, the output voltage of the power output end is slowly reduced, after the delay time of the delay circuit, the output voltage of the power output end cannot be reduced below the set voltage Vref of the comparison circuit, the output of the comparison circuit keeps the original level, and therefore the bleeder circuit is closed.

Exemplary embodiments of the proposed solution of the present disclosure have been described in detail above with reference to preferred embodiments, however, it will be understood by those skilled in the art that many variations and modifications may be made to the specific embodiments described above, and that many combinations of the various technical features, structures presented in the present disclosure may be made without departing from the concept of the present disclosure, without departing from the scope of the present disclosure, which is defined by the appended claims.

Claims

1. The utility model provides a power output protection circuit that releases, includes power, load, comparison circuit, delay circuit and bleeder circuit, characterized in that, the positive output of power respectively with the positive input of load and bleeder circuit electric connection, the negative output of power respectively with the negative input of load and bleeder circuit electric connection, the power respectively with comparison circuit's input, delay circuit's input and bleeder circuit electric connection, and comparison circuit's output electric connection has triode Q3's collecting electrode and bleeder circuit's input, triode Q3's base and delay circuit's output electric connection, triode Q3's projecting pole ground connection.

2. The power supply output leakage protection circuit according to claim 1, wherein the leakage circuit includes a transistor Q2, a transistor Q1 and a resistor R, a base of the transistor Q2 is electrically connected to a collector of the transistor Q3, an emitter of the transistor Q2 is grounded, a collector of the transistor Q2 is electrically connected to a power supply and a base of a diode Q1, an emitter of the diode Q1 is grounded, a collector of the transistor Q1 is electrically connected to one end of the resistor R, and the other end of the resistor R is electrically connected to a negative output end of the power supply.

3. The power supply output leakage protection circuit of claim 1, wherein the comparison circuit is configured to compare the voltage provided by the power supply with its own set voltage Vref.

4. The power supply output leakage protection circuit of claim 1, wherein the delay circuit is configured to delay the voltage provided by the power supply and compare the delayed voltage provided by the power supply with its own set voltage Vref.