CN210183025U - Battery reverse connection prevention circuit - Google Patents
Battery reverse connection prevention circuit Download PDFInfo
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- CN210183025U CN210183025U CN201920783825.3U CN201920783825U CN210183025U CN 210183025 U CN210183025 U CN 210183025U CN 201920783825 U CN201920783825 U CN 201920783825U CN 210183025 U CN210183025 U CN 210183025U
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Abstract
A battery anti-reverse connection circuit relates to the technical field of a standby power supply control circuit, solves the technical defects of the existing battery anti-reverse connection protection circuit that the limitation exists, the reliability is not strong, and the occupied volume is large in the occasion with high voltage; a switch circuit is arranged between the charging loop and the battery interface, a switch driving circuit for driving the switch circuit to be conducted is further arranged on the charging loop, and the switch driving circuit is connected with a battery reverse connection protection circuit which is disconnected by the reverse connection of the battery interface under the action of low voltage. The discharging current of the battery cannot enter a charging loop to form the purpose of safety protection, and the circuit automatically resets after the battery is connected; the components are easy to select, the price is low, the occupied volume is small, and the like.
Description
Technical Field
The utility model relates to stand-by power supply control circuit technical field, concretely relates to battery joins conversely protection circuit improves the aspect.
Background
Generally, in the occasions where batteries are applied, the function of preventing reverse connection of the batteries is often needed, and in general, if the batteries only have a single discharge loop, the function of preventing reverse connection is generally realized by utilizing the unidirectional conductivity of a diode; when a large current is needed, the MOS tube (loss is reduced) control is adopted to achieve the purpose of reverse connection prevention protection.
However, in most industrial applications, the battery is often used as a backup battery to improve the reliability of the system, i.e. during normal applications, the system is powered by the mains supply, and the backup battery needs to be charged, and once the mains supply is powered down, the backup battery needs to be seamlessly switched to the system power supply to achieve the purpose of uninterrupted power supply. Such applications require battery charging and discharging applications, which are not easily realized by a single diode or MOS transistor. Under the condition, a diode and a PTC fuse are often used together to achieve the purpose of reverse connection prevention protection.
The prior art has the following defects:
because the battery needs two loops of a charging loop and a discharging loop when in application, under the condition that the two loops simultaneously meet the requirement of reverse connection prevention, the aim of reverse connection prevention protection is achieved by using the cooperation of the diode and the PTC fuse in general; as shown in fig. 1, this approach uses a large current during the reverse connection of the battery to heat the PTC and open the circuit of the PTC to achieve the protection. It can be seen from the circuit that when the batteries are reversely connected, two discharging loops are provided, which easily damages the components in the circuit, and when the PTC is disconnected, the two ends of the PTC need to bear 2 times of the battery voltage, for example, 48V batteries are adopted, the PTC needs to withstand voltage of at least more than 100V; in addition, due to the fact that the temperature characteristics of the PTC are greatly influenced by the environment, the PTC is difficult to select when the working environment changes greatly, the general PTC cannot meet the requirement when the voltage is high, the PTC which exceeds 100V is difficult to find in the market, and the PTC is larger in volume when the voltage is higher, so that the method has great limitation.
SUMMERY OF THE UTILITY MODEL
To sum up, the utility model discloses an aim at solves current battery and prevents reverse-connection protection circuit existence: 1. the scheme has great limitation, and elements are not easy to select types; 2. the reliability is not strong, the realization is not easy, and the effect is not good; 3. the technical defect of large volume occupied by high-voltage occasions is overcome, and a battery reverse connection prevention circuit is provided.
For solving the technical problem of the utility model, the technical scheme of adoption is:
a battery reverse connection prevention circuit comprises a battery interface, wherein the battery interface is connected with a charging loop and a discharging loop in parallel; the discharging loop comprises a first unidirectional discharging circuit for limiting the battery interface to supply power to the load in a unidirectional mode and a second unidirectional power supply circuit for limiting the main loop to supply power to the load in a unidirectional mode; the method is characterized in that: a switch circuit is arranged between the charging loop and the battery interface, a switch driving circuit for driving the switch circuit to be conducted is further arranged on the charging loop, and the switch driving circuit is connected with a battery reverse connection protection circuit which is connected with the battery interface in parallel and is pulled to be disconnected by the reverse connection of the battery interface under the action of the voltage.
As to the technical scheme of the utility model for further limiting includes:
the switch circuit is an MOS tube control circuit, and the switch driving circuit comprises a triode Q1 connected with and controlling the MOS tube control circuit, a resistor R2 and a resistor R3 which are connected with a charging loop and provide bias voltage for the base electrode of the triode Q1; the battery reverse connection protection circuit comprises a diode D2 and a resistor R4 which are connected between battery interfaces in series, wherein the diode D2 is connected with the resistor R3 in parallel, and when the battery interfaces are in reverse connection with voltage, the resistor R3 is in short circuit, and the triode Q1 is controlled to be disconnected.
The MOS tube control circuit comprises a MOS tube Q3 connected between the charging loop and the battery interface, a resistor R1 and a resistor R5 which are connected between the charging loop and the triode Q1 and provide bias voltage for the grid electrode of the MOS tube Q3.
The charging loop comprises a transformer T1, and the output end of the transformer T1 is connected with a charging pi-type filter circuit consisting of a charging rectifier diode D1, a capacitor CE1, an inductor L1 and a capacitor CE 2.
And a detection resistor RS1 for constant current charging of the battery is connected in series on the charging loop.
The first unidirectional discharge circuit and the second unidirectional power supply circuit are a diode D3 and a diode D4 respectively.
The utility model has the advantages that: under normal conditions, the switch driving circuit is conducted under the action of the charging loop, so that the switch circuit is driven to be conducted, and the charging loop charges the battery connected with the battery interface; when the battery at the battery interface is reversely connected, the reverse connection protection circuit of the battery is switched on to form a current loop, so that the switch driving circuit is forcibly pulled down to be switched off, the switch circuit is switched off, the discharging current of the battery cannot enter a charging loop to form the purpose of safety protection, and the circuit automatically resets after the battery is positively connected; the utility model discloses be fit for the occasion that battery has charging circuit on the general industrial application, the scheme is reliable and stable realizes easily, and components and parts are selected the type easily, and the low price occupies advantages such as small.
Drawings
FIG. 1 is a schematic diagram of a circuit schematic structure of a conventional battery reverse connection prevention protection circuit;
fig. 2 is a schematic diagram of the circuit principle structure of the present invention.
Detailed Description
The structure of the present invention will be further described with reference to the accompanying drawings and preferred embodiments of the present invention.
Referring to fig. 2, the utility model relates to a reverse connection prevention circuit for battery, including the battery interface that supplies the battery to connect, the battery interface comprises battery positive terminal BAT + and battery negative terminal BAT-, and the battery interface has connect in parallel and has charge circuit and discharge circuit.
The discharging loop comprises a first unidirectional discharging circuit for limiting the battery interface to supply power to the load in a unidirectional mode and a second unidirectional power supply circuit for limiting the main loop to supply power to the load in a unidirectional mode; in this embodiment, the first unidirectional discharging circuit and the second unidirectional power supplying circuit are a diode D3 and a diode D4, respectively, the diode D3 and the diode D4 are connected to the output terminal VO, respectively, and the output terminal VO is connected to the load; under normal conditions, the output voltage of the main loop is slightly higher than the battery voltage, the output voltage of the main loop supplies power to the load in a single direction through the diode D4, and when the main loop is powered down, the battery voltage supplies power to the load uninterruptedly through the diode D3, so that the purpose of a standby power supply is achieved.
The utility model discloses a main innovation point lies in: a switch circuit is arranged between the charging loop and the battery interface, a switch driving circuit for driving the switch circuit to be conducted is further arranged on the charging loop, and the switch driving circuit is connected with a battery reverse connection protection circuit which is connected with the battery interface in parallel and is pulled to be disconnected by the reverse connection of the battery interface under the action of the voltage.
Specifically, the switch circuit is a MOS transistor control circuit, and the switch driving circuit includes a transistor Q1 connected to control the MOS transistor control circuit, and a resistor R2 and a resistor R3 connected to the charging loop to provide a bias voltage to the base of the transistor Q1; the battery reverse connection protection circuit comprises a diode D2 and a resistor R4 which are connected between battery interfaces in series, wherein the diode D2 is connected with the resistor R3 in parallel, and when the battery interfaces are in reverse connection with voltage, the resistor R3 is in short circuit, and the triode Q1 is controlled to be disconnected. The MOS tube control circuit comprises a MOS tube Q3 connected between the charging loop and the battery interface, a resistor R1 and a resistor R5 which are connected between the charging loop and the triode Q1 and provide bias voltage for the grid electrode of the MOS tube Q3.
The charging loop is mainly used for charging a battery connected with a battery interface, the battery is correctly connected, a battery reverse connection protection circuit consisting of a diode D2 and a resistor R4 does not work, the charging loop is in a normal charging state, the charging loop provides bias voltage for a base electrode of a triode Q1 through the resistor R2 and the resistor R3, the triode Q1 is conducted, a MOS tube Q3 is also conducted after the triode Q1 is conducted, and the battery is normally charged under the conducting state of the MOS tube Q3; when the battery is reversely connected, the battery reverse connection protection circuit formed by the diode D2 and the resistor R4 forms a current loop, the diode D2 is equivalent to short-circuit the resistor R3, and provides reverse bias voltage for the base electrode of the triode Q1, so that the triode Q1 is not conducted, the MOS tube Q3 is not conducted, the charging loop is disconnected, and the purpose of reverse connection protection of the battery is achieved.
The charging loop comprises a transformer T1, the secondary coil of the transformer T1 is connected with a charging pi-type filter circuit consisting of a charging rectifier diode D1, a capacitor CE1, an inductor L1 and a capacitor CE2 through the output end, and therefore a constant charging loop is provided for the battery; and a detection resistor RS1 for constant current charging of the battery is connected in series on the charging loop.
That is the utility model discloses a MOS pipe control realizes above having the function of the protection of preventing joining conversely of two kinds of return circuits.
Claims (6)
1. A battery reverse connection prevention circuit comprises a battery interface, wherein the battery interface is connected with a charging loop and a discharging loop in parallel; the discharging loop comprises a first unidirectional discharging circuit for limiting the battery interface to supply power to the load in a unidirectional mode and a second unidirectional power supply circuit for limiting the main loop to supply power to the load in a unidirectional mode; the method is characterized in that: a switch circuit is arranged between the charging loop and the battery interface, a switch driving circuit for driving the switch circuit to be conducted is further arranged on the charging loop, and the switch driving circuit is connected with a battery reverse connection protection circuit which is connected with the battery interface in parallel and is pulled to be disconnected by the reverse connection of the battery interface under the action of the voltage.
2. A battery anti-reverse connection circuit according to claim 1, characterized in that: the switch circuit is an MOS tube control circuit, and the switch driving circuit comprises a triode Q1 connected with and controlling the MOS tube control circuit, a resistor R2 and a resistor R3 which are connected with a charging loop and provide bias voltage for the base electrode of the triode Q1; the battery reverse connection protection circuit comprises a diode D2 and a resistor R4 which are connected between battery interfaces in series, wherein the diode D2 is connected with the resistor R3 in parallel, and when the battery interfaces are in reverse connection with voltage, the resistor R3 is in short circuit, and the triode Q1 is controlled to be disconnected.
3. A battery anti-reverse connection circuit according to claim 2, characterized in that: the MOS tube control circuit comprises a MOS tube Q3 connected between the charging loop and the battery interface, a resistor R1 and a resistor R5 which are connected between the charging loop and the triode Q1 and provide bias voltage for the grid electrode of the MOS tube Q3.
4. A battery anti-reverse connection circuit according to claim 1, characterized in that: the charging loop comprises a transformer T1, and the output end of the transformer T1 is connected with a charging pi-type filter circuit consisting of a charging rectifier diode D1, a capacitor CE1, an inductor L1 and a capacitor CE 2.
5. A battery anti-reverse connection circuit according to claim 4, characterized in that: and a detection resistor RS1 for constant current charging of the battery is connected in series on the charging loop.
6. A battery anti-reverse connection circuit according to claim 1, characterized in that: the first unidirectional discharge circuit and the second unidirectional power supply circuit are a diode D3 and a diode D4 respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920783825.3U CN210183025U (en) | 2019-05-28 | 2019-05-28 | Battery reverse connection prevention circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920783825.3U CN210183025U (en) | 2019-05-28 | 2019-05-28 | Battery reverse connection prevention circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210183025U true CN210183025U (en) | 2020-03-24 |
Family
ID=69835114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920783825.3U Active CN210183025U (en) | 2019-05-28 | 2019-05-28 | Battery reverse connection prevention circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210183025U (en) |
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2019
- 2019-05-28 CN CN201920783825.3U patent/CN210183025U/en active Active
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