CN210517839U - Charging backflow prevention circuit - Google Patents
Charging backflow prevention circuit Download PDFInfo
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- CN210517839U CN210517839U CN201921613264.9U CN201921613264U CN210517839U CN 210517839 U CN210517839 U CN 210517839U CN 201921613264 U CN201921613264 U CN 201921613264U CN 210517839 U CN210517839 U CN 210517839U
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- resistor
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- triode
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- rechargeable battery
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- 230000002265 prevention Effects 0.000 title description 7
- 230000005669 field effect Effects 0.000 claims abstract description 28
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
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Abstract
The utility model discloses a charging anti-backflow circuit, which comprises an input voltage, a rechargeable battery, a field effect tube and a triode; the positive electrode of the input voltage is respectively connected with one end of the first resistor and the source electrode of the field effect transistor, the other end of the first resistor is connected with the negative electrode of the first diode, the positive electrode of the first diode is respectively connected with the base electrode of the triode and the negative electrode of the input voltage, the emitting electrode of the triode is connected with the negative electrode of the rechargeable battery, the collecting electrode of the triode is connected with one end of the fourth resistor, the other end of the fourth resistor is respectively connected with the grid electrode of the field effect transistor and one end of the third resistor, and the drain electrode of the field effect transistor and the other end of the third resistor are connected with the positive electrode of the rechargeable battery after. The utility model discloses a detect zener diode and whether have the turn-off that voltage comes the control triode and then control field effect transistor and open or turn-off to the turn-off between control input voltage and the rechargeable battery.
Description
Technical Field
The utility model relates to an electronic circuit technical field, in particular to prevent flowing backward circuit charges.
Background
A backflow prevention circuit is needed between the charging circuit and the rechargeable battery, so that the charging circuit is prevented from consuming the electric quantity of the battery under the condition of no charging. In the prior art, a diode is connected in series between a charging circuit and a rechargeable battery to prevent the electric quantity of the battery from flowing backwards, but due to the large forward voltage drop of the diode, the power loss and the heat generation are very large, so that the charging efficiency is low.
Disclosure of Invention
To among the prior art problem that charging circuit current flows backward, charge efficiency is low, the utility model provides a circuit that flows backward is prevented in charging that charge efficiency is high.
In order to achieve the above object, the present invention provides the following technical solutions:
a charging anti-backflow circuit comprises a field effect transistor, a voltage stabilizing diode and a triode;
the positive electrode of the input voltage is connected with one end of the first resistor and the source electrode of the field effect transistor respectively, the other end of the first resistor is connected with the negative electrode of the first voltage stabilizing diode, the positive electrode of the first voltage stabilizing diode is connected with the base electrode of the triode and the negative electrode of the input voltage respectively, the emitting electrode of the triode is connected with the negative electrode of the rechargeable battery, the collecting electrode of the triode is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the grid electrode of the field effect transistor, and the drain electrode of the field effect transistor is connected with the positive electrode of the rechargeable battery.
Preferably, the power supply further comprises a second resistor, one end of the second resistor is connected with the negative electrode of the input voltage, and the other end of the second resistor is respectively connected with the base electrode of the triode.
Preferably, the device further comprises a third resistor, one end of the third resistor is connected with the gate of the field effect transistor, and the other end of the third resistor is connected with the source of the field effect transistor.
Preferably, the field effect transistor is a P-channel type field effect transistor; the triode is an NPN type triode.
To sum up, owing to adopted above-mentioned technical scheme, compare with prior art, the utility model discloses following beneficial effect has at least:
the utility model discloses a through utilizing the voltage difference before input voltage and the rechargeable battery to detect whether the charger inserts in order to control the switching on and the shutoff of MOS pipe to control the shutoff between charging circuit and the rechargeable battery, prevented that the electric quantity of rechargeable battery from flowing backward to the charging circuit in, practiced thrift rechargeable battery's electric quantity, improved the utilization efficiency; and the circuit has few components, so that the circuit cost is saved.
Description of the drawings:
fig. 1 is a schematic diagram of a charging backflow prevention circuit according to an exemplary embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of a charging backflow prevention circuit according to the exemplary embodiment 2 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and specific embodiments. However, it should not be understood that the scope of the above-mentioned subject matter is limited to the following embodiments, and all the technologies realized based on the present invention are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or may be connected between two elements through an intermediate medium, or may be directly connected or indirectly connected, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
Example 1:
fig. 1 is a schematic diagram of a charging backflow prevention circuit according to embodiment 1 of the present invention, which includes an input voltage, a zener diode, a field effect transistor and a triode, wherein a positive terminal Vin + of the input voltage is connected to one end of a first resistor R1 and a source of the field effect transistor Q1, the other end of the first resistor R1 is connected to a negative terminal of a first zener diode D1, a positive terminal of the first zener diode D1 is connected to one end of a second resistor R2 and a base of the triode Q2, the other end of the second resistor R2 is connected to a negative terminal Vin-, and the negative terminal Vin-of the input voltage is connected to a negative terminal Bat-of a rechargeable battery through a conducting wire; an emitting electrode of the triode Q2 is connected with a negative electrode Bat < - > of the rechargeable battery, a collector electrode of the triode Q2 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected with a grid electrode of the field-effect tube Q1 and one end of a third resistor R3 respectively, and a drain electrode of the field-effect tube Q1 is connected with the other end of the third resistor R3 in parallel and then connected with a positive electrode Bat < + > of the rechargeable battery.
In this embodiment, the fet Q2 is a P-channel fet; the triode Q1 is an NPN type triode.
In this embodiment, the full charge voltage of the rechargeable battery is 12.6V, the voltage regulation value of the zener diode D1 needs to be greater than 12.6V, and a zener diode of 13V may be selected. When charging is stopped or power is cut off, the voltage at two ends of input voltage (Vin + and Vin-) and the voltage of the rechargeable battery are both lower than the voltage-stabilized value of 13V of the voltage-stabilized diode, so that the triode Q2 is cut off, the field-effect tube Q1 is closed, and the function of preventing backflow is achieved.
In this embodiment, the first resistor R1 is used for limiting current, and can obtain a resistance value according to the operating current of the first diode D1, so as to prevent the diode in the circuit from being broken down due to an excessive voltage.
In this embodiment, the first diode D1 is a zener diode, and a 13V zener diode can be selected to detect whether there is a voltage input in the circuit, and if there is a voltage input higher than 13.6V, the transistor Q2 (the transistor has a voltage drop of 0.6V) is turned on, so as to control the on-state of the field effect transistor Q1; if the voltage of the rechargeable battery is not lower than the voltage-stabilizing value of the first diode D1, the triode Q2 is turned off, so that the field effect transistor Q1 is controlled to be turned off, the current of the rechargeable battery cannot flow back into the charging circuit, and compared with the mode that the diode is used alone to prevent flowing back, the charging efficiency is obviously improved.
In this embodiment, the second resistor R2 is used to provide a smaller working current for the first diode D1, and to prevent the input voltage from fluctuating, so that a small current is generated in the circuit to turn on the transistor Q2 and then close the fet Q1, and the electric quantity of the rechargeable battery is then returned to the charging circuit.
In this embodiment, two ends of the third resistor R3 are respectively connected to the gate and the drain of the fet Q1, so that after the charge stop triode Q2 is turned off, the drain of the fet Q1 is prevented from being erroneously turned on in a floating state; the fourth resistor R4 is connected between the transistor Q2 and the transistor Q1, and can adjust the turn-on speed and voltage of the transistor Q1.
Example 2:
fig. 2 is a schematic diagram of a charging back-flow prevention circuit according to embodiment 2 of the present invention, in which the fet Q3 is an N-channel fet; the triode Q4 is a PNP type triode, the positive pole Vin + of input voltage is directly connected with the positive pole Bat + of the rechargeable battery through a lead, and the negative pole Vin-of input voltage is connected with the negative pole Bat-of the rechargeable battery through a field effect transistor Q3;
namely, the negative electrode Vin-of the input voltage is respectively connected with one end of a fifth resistor R5, one end of a sixth resistor R6 and the source electrode of a field effect transistor Q3, the other end of the fifth resistor R5 is connected with the positive electrode of a voltage stabilizing diode D2, the negative electrode of a diode D2 is respectively connected with the base level of a triode Q4 and one end of an eighth resistor R8, and the other end of the eighth resistor R8 is connected with the positive electrode Vin +; the emitter of the triode Q4 is connected with the positive electrode Bat + of the rechargeable battery; the collector of the triode Q4 is connected with one end of a seventh resistor R7, the other end of the seventh resistor R7 is respectively connected with the other end of a sixth resistor R6 and the grid of a field-effect tube Q3, and the drain of the field-effect tube Q3 is connected with the negative electrode Bat-of the rechargeable battery.
It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.
Claims (4)
1. A charging anti-backflow circuit comprises an input voltage, and is characterized by further comprising a field effect transistor, a voltage stabilizing diode, a resistor and a triode;
the positive electrode of the input voltage is connected with one end of the first resistor and the source electrode of the field effect transistor respectively, the other end of the first resistor is connected with the negative electrode of the first voltage stabilizing diode, the positive electrode of the first voltage stabilizing diode is connected with the base electrode of the triode and the negative electrode of the input voltage respectively, the emitting electrode of the triode is connected with the negative electrode of the rechargeable battery, the collecting electrode of the triode is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the grid electrode of the field effect transistor, and the drain electrode of the field effect transistor is connected with the positive electrode of the rechargeable battery.
2. The charging anti-backflow circuit as claimed in claim 1, further comprising a second resistor, wherein one end of the second resistor is connected to a negative electrode of the input voltage, and the other end of the second resistor is connected to a base of the triode, respectively.
3. The charging anti-backflow circuit as claimed in claim 1, further comprising a third resistor, wherein one end of the third resistor is connected to the gate of the fet, and the other end of the third resistor is connected to the source of the fet.
4. The charging anti-backflow circuit of claim 1, wherein the fet is a P-channel fet; the triode is an NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921613264.9U CN210517839U (en) | 2019-09-26 | 2019-09-26 | Charging backflow prevention circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921613264.9U CN210517839U (en) | 2019-09-26 | 2019-09-26 | Charging backflow prevention circuit |
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| Publication Number | Publication Date |
|---|---|
| CN210517839U true CN210517839U (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921613264.9U Active CN210517839U (en) | 2019-09-26 | 2019-09-26 | Charging backflow prevention circuit |
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| CN (1) | CN210517839U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969710A (en) * | 2020-07-28 | 2020-11-20 | 北京浪潮数据技术有限公司 | Main and standby power supply circuit and storage power supply equipment |
| CN117595458A (en) * | 2024-01-12 | 2024-02-23 | 深圳市博瑞通信技术有限公司 | Program-controlled power supply circuit with charging protection function |
-
2019
- 2019-09-26 CN CN201921613264.9U patent/CN210517839U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111969710A (en) * | 2020-07-28 | 2020-11-20 | 北京浪潮数据技术有限公司 | Main and standby power supply circuit and storage power supply equipment |
| CN117595458A (en) * | 2024-01-12 | 2024-02-23 | 深圳市博瑞通信技术有限公司 | Program-controlled power supply circuit with charging protection function |
| CN117595458B (en) * | 2024-01-12 | 2024-05-03 | 深圳市博瑞通信技术有限公司 | Program-controlled power supply circuit with charging protection function |
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