CN217362600U - Low-cost output short circuit detection circuit - Google Patents
Low-cost output short circuit detection circuit Download PDFInfo
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- CN217362600U CN217362600U CN202123395708.6U CN202123395708U CN217362600U CN 217362600 U CN217362600 U CN 217362600U CN 202123395708 U CN202123395708 U CN 202123395708U CN 217362600 U CN217362600 U CN 217362600U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a low-cost output short circuit detection circuit, 1 foot of battery BAT is connected to GND, 2 feet of battery BAT are connected to 4 feet of transistor Q2 and 4 feet of transistor Q3, 3 feet of transistor Q2 are connected to 2 feet of resistance R1, 1 foot of resistance R1 is connected to 3 feet of transistor Q3, 3 feet of transistor Q3 are connected to 2 feet of resistance R2, 1 foot of resistance R2 is connected to GND. The utility model discloses a simple mode has just solved the start-up under output capacity, the short circuit state, can not cause any impact to the system, and is convenient and with low costs.
Description
Technical Field
The utility model relates to a low-cost output short circuit detection circuit belongs to circuit technical field.
Background
At present, in battery applications, a BMS is generally provided, that is, a battery management system, in the system, output short-circuit protection is considered, that is, between a battery and an actual load, there is an MOS transistor, when the output short-circuit occurs, the MOS transistor needs to be immediately turned off and cannot be damaged, otherwise, a battery core of the battery is directly short-circuited, and is seriously damaged, even the battery is heated, exploded and ignited.
In order to solve the problem, some schemes are to sample the output current and set a threshold, if the current is larger than the threshold, the MOS transistor is turned off to protect the battery, but in some applications, the load faced by the battery may be a capacitor, and when the capacitor is charged, the short circuit is basically equivalent to a short circuit, if the short circuit is turned off by the threshold, the short circuit cannot be started frequently in the occasion of capacitive load, the utility model provides an output short circuit detection circuit, which can judge the output state in a simple manner.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a low-cost output short circuit detection circuit utilizes a resistance, discharges to the output, judges whether short circuit according to the output voltage sampling to solve the problem that proposes in the above-mentioned background art.
In order to realize the purpose, the utility model adopts the following technical proposal:
a pin 1 of a battery BAT is connected to GND, a pin 2 of the battery BAT is connected to a pin 4 of a transistor Q2 and a pin 4 of a transistor Q3, a pin 3 of a transistor Q2 is connected to a pin 2 of a resistor R1, a pin 1 of the resistor R1 is connected to a pin 3 of a transistor Q3, a pin 3 of a transistor Q3 is connected to a pin 2 of a resistor R2, and a pin 1 of the resistor R2 is connected to GND.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a simple mode has just solved the start-up under output capacity, the short circuit state, can not cause any impact to the system, and is convenient and with low costs.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely explained below with reference to the drawings in the embodiment of the present invention.
As shown in fig. 1, in a low-cost output short-circuit detection circuit, pin 1 of a battery BAT is connected to GND, pin 2 of the battery BAT is connected to pin 4 of a transistor Q2 and pin 4 of a transistor Q3, pin 3 of a transistor Q2 is connected to pin 2 of a resistor R1, pin 1 of the resistor R1 is connected to pin 3 of a transistor Q3, pin 3 of a transistor Q3 is connected to pin 2 of a resistor R2, and pin 1 of the resistor R2 is connected to GND.
According to the circuit working principle, before the transistor Q3 is turned on, the transistor Q2 is turned on, after the transistor Q2 is turned on, the battery BAT discharges the load resistor R2 through the transistor Q2 and the resistor R1, and the resistance value of the resistor R1 is small and is about a few ohms;
when the resistor R2 is a normal load and the transistor Q2 is turned on, the voltages of the Vbat and the Vo points are basically the same, after the voltages sampled by the two points are consistent, the load can be judged to be normal, and the transistor Q3 can be turned on again; when the resistor R2 is a capacitive load, the transistor Q2 is switched on, the battery charges the output capacitor through the transistor Q2 and the resistor R1, the resistance of the R1 is very small, so that the capacitor is immediately arranged outside, the time constant caused by the resistor R1 is also very small, the voltage difference between the output capacitor and the battery is not much in a short time, the load can be judged to be normal after the two sampling voltages are found to be consistent after a certain time, and the transistor Q3 is switched on; when the resistor R2 is in a short-circuit state, the transistor Q2 is turned on, and then the battery is short-circuited to the ground through the transistor Q2 and the resistor R1, because the resistor R2 is in a short-circuit state, by sampling Vo after a certain time, it is found that the voltage is still 0, and it can be determined that the load is short-circuited, the transistor Q3 is not turned on, and the transistor Q2 is turned off. Therefore, the starting under the conditions of output capacitance and short circuit is realized in a simple mode, the system cannot be impacted, and the system is convenient and low in cost.
The foregoing is a preferred embodiment of the present invention, and for those skilled in the art to understand the teaching of the present invention, the changes, modifications, replacements and variations to the embodiments will still fall within the protection scope of the present invention without departing from the principle and spirit of the present invention.
Claims (1)
1. A low-cost output short-circuit detection circuit is characterized in that a pin 1 of a battery BAT is connected to GND, a pin 2 of the battery BAT is connected to a pin 4 of a transistor Q2 and a pin 4 of a transistor Q3, a pin 3 of a transistor Q2 is connected to a pin 2 of a resistor R1, a pin 1 of the resistor R1 is connected to a pin 3 of a transistor Q3, a pin 3 of a transistor Q3 is connected to a pin 2 of a resistor R2, and a pin 1 of the resistor R2 is connected to GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123395708.6U CN217362600U (en) | 2021-12-31 | 2021-12-31 | Low-cost output short circuit detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123395708.6U CN217362600U (en) | 2021-12-31 | 2021-12-31 | Low-cost output short circuit detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217362600U true CN217362600U (en) | 2022-09-02 |
Family
ID=83042267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123395708.6U Active CN217362600U (en) | 2021-12-31 | 2021-12-31 | Low-cost output short circuit detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217362600U (en) |
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2021
- 2021-12-31 CN CN202123395708.6U patent/CN217362600U/en active Active
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