CN217115613U - Undervoltage protection circuit - Google Patents
Undervoltage protection circuit Download PDFInfo
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- CN217115613U CN217115613U CN202220233550.8U CN202220233550U CN217115613U CN 217115613 U CN217115613 U CN 217115613U CN 202220233550 U CN202220233550 U CN 202220233550U CN 217115613 U CN217115613 U CN 217115613U
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Abstract
The utility model discloses an under-voltage protection circuit, including bleeder circuit, stabilivolt, triode and MOS pipe, bleeder circuit includes resistance R1, R2, R3, R5, R6, R7, and input voltage source and the projecting pole of connecting the triode are connected to resistance R1's one end, and the other end concatenates resistance R7 back ground connection and connects the reference pole of stabilivolt, and the reference pole and the positive pole of stabilivolt connect in resistance R7's both ends in parallel; one end of a cathode resistor R3 of the voltage stabilizing tube, the other end of the resistor R3 are connected with the base electrode of the triode and are connected with the emitting electrode of the triode after being connected with the resistor R2 in series; the collector of the triode is sequentially connected with the resistor R5 and the resistor R6 in series and then is respectively connected with the source of the MOS tube and the anode of the voltage regulator tube; the grid of the MOS tube is connected with the collector of the triode after being connected with the resistor R5 in series, the drain of the MOS tube is used as the negative output end of the undervoltage protection circuit, and the emitter of the triode is used as the positive output end of the undervoltage protection circuit. The utility model discloses simple structure is favorable to reducing undervoltage protection circuit's application cost.
Description
Technical Field
The utility model relates to a battery protection technology field, concretely relates to undervoltage protection circuit.
Background
In the technical field of battery protection, undervoltage, namely, the battery voltage is too low to meet the critical value of normal running and use of a vehicle. If the battery is continuously used at the moment, the battery is greatly damaged, and the service life of the battery is seriously influenced. Therefore, when the battery voltage decreases to the critical voltage, an action for protecting the battery needs to be performed, which is called under-voltage protection of the battery. For example, a granted patent (publication number CN104052027A) entitled "under-voltage protection circuit and granted device" requires a set of control program to be burned into a voltage control chip to implement the voltage detection and under-voltage protection functions, and has a complex circuit structure and a high application cost.
SUMMERY OF THE UTILITY MODEL
The utility model discloses use the structure of simplifying undervoltage protection circuit as the purpose, provide an undervoltage protection circuit.
To achieve the purpose, the utility model adopts the following technical proposal:
the undervoltage protection circuit comprises a voltage division circuit, a voltage-regulator tube, a triode Q1 and a MOS tube Q2, wherein the voltage division circuit comprises resistors R1, R2, R3, R5, R6 and R7, one end of the resistor R1 is connected with an input voltage source and is connected with an emitter of the triode Q1, the other end of the resistor R7 is connected in series, then is grounded and is connected with a reference electrode of the voltage-regulator tube, and a reference electrode and an anode of the voltage-regulator tube are connected with two ends of the resistor R7 in parallel; one end of a cathode resistor R3 of the voltage stabilizing tube and the other end of the resistor R3 are connected with the base electrode of the triode Q1 and are connected with the emitter electrode of the triode Q1 after being connected with the resistor R2 in series; the collector of the triode Q1 is sequentially connected in series with the resistor R5 and the resistor R6 and then respectively connected with the source of the MOS transistor Q2 and the anode of the voltage regulator tube; the gate of the MOS transistor Q2 is connected in series with the resistor R5 and then connected to the collector of the transistor Q1, the drain of the MOS transistor Q2 serves as the negative output terminal of the undervoltage protection circuit, and the emitter of the transistor Q1 serves as the positive output terminal of the undervoltage protection circuit.
As an optimized proposal of the utility model, the model of the voltage stabilizing tube is TL 431.
As a preferred scheme of the utility model, triode Q1 is the PNP triode of model SS 8550.
As a preferable scheme of the present invention, the MOS transistor Q2 is an NMOS transistor with a model number of 12N 60C.
As a preferred scheme of the utility model, the under-voltage protection circuit still includes anti reverse diode DV1, diode DV 1's positive pole is connected input voltage source, and the negative pole is connected triode Q1's projecting pole.
As a preferred embodiment of the present invention, the diode DV1 has a model SS 210.
As an optimized scheme of the utility model, the undervoltage protection circuit still includes diode VD1, the negative pole of stabilivolt concatenates behind resistance R3 connect diode VD 1's negative pole, diode VD 1's anodal connection triode Q1's base just concatenates connect behind the resistance R2 connect triode Q1's projecting pole.
As an optimized scheme of the utility model, the undervoltage protection circuit still includes diode VD2, triode Q1's collecting electrode concatenates connect behind the resistance R5 diode VD 2's positive pole, diode VD 2's negative pole is connected resistance R6's one end, resistance R6's the other end is connected the positive pole of stabilivolt and connection MOS transistor Q3's source electrode.
As an optimized scheme of the utility model, the undervoltage protection circuit still includes resistance R4, resistance R4's one end concatenates connect behind the resistance R5 triode Q1's collecting electrode, the other end is connected MOS pipe Q2's grid.
As a preferable scheme of the present invention, the models of the diode VD1 and the diode VD2 are 1N 4007;
the voltage input to the undervoltage protection circuit by the input voltage source is 48V;
the resistances of the resistors R1, R2, R3, R4, R5, R6 and R7 are respectively 15 kilo-ohm, 10 kilo-ohm, 4.7 kilo-ohm, 1 kilo-ohm, 15 kilo-ohm, 2.2 kilo-ohm and 1 kilo-ohm.
The utility model discloses an undervoltage protection circuit that bleeder circuit, stabilivolt, triode, MOS pipe constitute has realized the undervoltage protection function promptly, and the undervoltage protection circuit simple structure that provides is favorable to reducing undervoltage protection circuit's application cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a circuit structure diagram of the under-voltage protection circuit provided by the embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are used only for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms will be understood by those skilled in the art according to the specific circumstances.
In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between the components, is to be understood broadly, for example, as being either a fixed connection, a detachable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other components or may be in an interactive relationship with one another. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment of the utility model provides an under-voltage protection circuit, as shown in fig. 1, including bleeder circuit, stabilivolt 1, triode Q1, MOS pipe Q2, anti-transposition diode DV1, resistance R4, diode VD1, VD2, bleeder circuit includes resistance R1, R2, R3, R5, R6, R7, diode DV 1's negative pole is connected to resistance R1's one end, and connect triode Q1's projecting pole, the other end concatenates resistance R7 back ground connection and connects the reference pole of stabilivolt, input voltage source is connected to diode DV 1's positive pole; the reference electrode and the anode of the voltage regulator tube are connected in parallel at two ends of the resistor R7; the cathode of the voltage-stabilizing tube is connected with one end of a resistor R3, the other end of the resistor R3 is connected with the cathode of a diode VD1, the anode of the diode VD1 is connected with the base electrode of a triode Q1 and is connected with the emitter of the triode Q1 after being connected with a resistor R2 in series; the collector of the triode Q1 is connected in series with a resistor R5, a diode VD2 and a resistor R6 in sequence and then is respectively connected with the source of the MOS tube Q2 and the anode of the voltage regulator tube; the gate of the MOS transistor Q2 is connected in series with the resistors R4 and R4 in sequence and then connected to the collector of the transistor Q1, the drain is used as the negative output terminal of the undervoltage protection circuit, and the emitter of the transistor Q1 is used as the positive output terminal of the undervoltage protection circuit.
Preferably, a voltage regulator tube of model number TL431 is used in this embodiment. TL431 is a controllable precision regulator whose output voltage can be set anywhere from Vref (2.5V) to 36V with two resistors, the typical dynamic impedance of the device is 0.2 Ω, and in this embodiment, it is used in place of the zener diode. The TL431 type voltage stabilizing tube has the advantages of good performance and low price.
The transistor Q1 is preferably a PNP transistor of type SS 8550. The SS8550 PNP triode has the advantages of low price and low switching loss power.
The MOS transistor Q2 is preferably an NMOS transistor with the model number of 12N 60C. The MOS tube of the type has good voltage resistance, and has the advantage of almost no power loss when being used in the undervoltage protection circuit.
The model of the diode VD1 is preferably SS210, and the application of the diode in the under-voltage protection circuit provided by the present embodiment has the advantage that a single schottky diode can provide good reverse connection resistance.
The model of the diodes VD1 and VD2 is preferably 1N4007, and the diodes of the model are applied to the under-voltage protection circuit provided by the embodiment and have the advantages of low price and good reverse connection resistance.
The following description briefly explains the implementation principle of the undervoltage protection function of the undervoltage protection circuit provided in this embodiment, taking a lead-acid battery as an undervoltage protection object as an example:
for a 48V lead-acid battery, the purpose of under-voltage protection is that when the battery voltage of the lead-acid battery is lower than 40V, the under-voltage protection circuit has no output. Referring to fig. 1, when the normal operating voltage of the battery is 48V, the voltage obtained by dividing the resistor R7 is greater than the TL431 conduction voltage, and at this time, the TL431 is conducted, and as the operating voltage of the battery decreases, the TL431 is always in a conduction state, and both ends of the voltage regulator AK ("a" and "K" respectively represent the anode and cathode of the voltage regulator) are in a low voltage state. Until the battery voltage drops below 40V, the voltage across R7 is less than 2.5V, the conduction condition of TL431 is not satisfied, TL431 is in the cut-off state, and the voltage across AK is close to the power supply voltage.
When the battery normally works, the base voltage of the triode Q1 is smaller than the emitter voltage, the triode Q1 is normally conducted, when the battery voltage is smaller than 40V, the TL431 is cut off, the base voltage of the triode Q1 is close to the emitter voltage, and the triode Q1 is in a cut-off state.
When the battery normally works, the triode Q1 is conducted, the grid electrode high level of the MOS tube Q2 is conducted, the triode Q1 is cut off when the battery is under-voltage, and the grid electrode low level of the MOS tube Q2 is cut off.
The additional description of the functions of the other devices in the undervoltage protection circuit shown in fig. 1 is as follows:
diode SS210(DV 1): by utilizing the reverse cut-off characteristic of the diode, the diode DV1 is added at the power supply voltage input end of the undervoltage protection circuit, so that the anti-reverse connection effect is added for the undervoltage protection circuit;
resistor 10K (R2) providing a saturation current to the base of transistor Q1;
diode 1N4007(VD1, VD 2): the base and the collector of the protective triode Q1;
resistance 4.7K (R3): when TL431 is conducted, resistor R3 plays a role in voltage division;
resistance 1K (R4): the switch is used for discharging the electric quantity of the parasitic capacitance when the MOS tube Q2 is switched.
It should be understood that the above-described embodiments are merely illustrative of the preferred embodiments of the present invention and the technical principles thereof. It will be understood by those skilled in the art that various modifications, equivalents, changes, and the like can be made to the present invention. However, these modifications are within the scope of the present invention as long as they do not depart from the spirit of the present invention. In addition, certain terms used in the specification and claims of the present application are not limiting, but are used merely for convenience of description.
Claims (10)
1. An undervoltage protection circuit is characterized by comprising a voltage division circuit, a voltage regulator tube, a triode Q1 and a MOS tube Q2, wherein the voltage division circuit comprises resistors R1, R2, R3, R5, R6 and R7, one end of the resistor R1 is connected with an input voltage source and is connected with an emitter of the triode Q1, the other end of the resistor R7 is connected in series and then is grounded and is connected with a reference electrode of the voltage regulator tube, and the reference electrode and an anode of the voltage regulator tube are connected with two ends of the resistor R7 in parallel; one end of a cathode resistor R3 of the voltage stabilizing tube and the other end of the resistor R3 are connected with the base electrode of the triode Q1 and are connected with the emitter electrode of the triode Q1 after being connected with the resistor R2 in series; the collector of the triode Q1 is sequentially connected in series with the resistor R5 and the resistor R6 and then respectively connected with the source of the MOS transistor Q2 and the anode of the voltage regulator tube; the gate of the MOS transistor Q2 is connected in series with the resistor R5 and then connected to the collector of the transistor Q1, the drain of the MOS transistor Q2 is used as the negative output terminal of the undervoltage protection circuit, and the emitter of the transistor Q1 is used as the positive output terminal of the undervoltage protection circuit.
2. The undervoltage protection circuit of claim 1, wherein the regulator tube is model number TL 431.
3. The undervoltage protection circuit of claim 1, wherein the transistor Q1 is a PNP transistor model SS 8550.
4. The undervoltage protection circuit of claim 1, wherein the MOS transistor Q2 is an NMOS transistor with a model number of 12N 60C.
5. The undervoltage protection circuit of claim 1, further comprising a diode DV1 connected in reverse, wherein an anode of the diode DV1 is connected to the input voltage source, and a cathode of the diode DV1 is connected to an emitter of the transistor Q1.
6. The undervoltage protection circuit of claim 5, wherein the diode DV1 is model SS 210.
7. The undervoltage protection circuit of claim 1, further comprising a diode VD1, wherein a cathode of the voltage regulator is connected in series with the resistor R3 and then connected to a cathode of the diode VD1, and an anode of the diode VD1 is connected to a base of the transistor Q1 and is connected in series with the resistor R2 and then connected to an emitter of the transistor Q1.
8. The undervoltage protection circuit of claim 7, further comprising a diode VD2, wherein a collector of the transistor Q1 is connected in series with the resistor R5 and then connected to an anode of the diode VD2, a cathode of the diode VD2 is connected to one end of the resistor R6, and the other end of the resistor R6 is connected to an anode of the voltage regulator and connected to the source of the MOS transistor Q3.
9. The undervoltage protection circuit of claim 8, further comprising a resistor R4, wherein one end of the resistor R4 is connected in series with the resistor R5 and then connected to a collector of the transistor Q1, and the other end of the resistor R4 is connected to a gate of the MOS transistor Q2.
10. The undervoltage protection circuit of claim 8, wherein the diode VD1 and the diode VD2 are of a type 1N 4007;
the voltage input to the undervoltage protection circuit by the input voltage source is 48V;
the resistances of the resistors R1, R2, R3, R4, R5, R6 and R7 are respectively 15 kilo-ohm, 10 kilo-ohm, 4.7 kilo-ohm, 1 kilo-ohm, 15 kilo-ohm, 2.2 kilo-ohm and 1 kilo-ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220233550.8U CN217115613U (en) | 2022-01-27 | 2022-01-27 | Undervoltage protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220233550.8U CN217115613U (en) | 2022-01-27 | 2022-01-27 | Undervoltage protection circuit |
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| CN217115613U true CN217115613U (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220233550.8U Active CN217115613U (en) | 2022-01-27 | 2022-01-27 | Undervoltage protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115864306A (en) * | 2023-02-28 | 2023-03-28 | 中电装备山东电子有限公司 | Single-phase meter and carrier power supply undervoltage protection device |
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- 2022-01-27 CN CN202220233550.8U patent/CN217115613U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115864306A (en) * | 2023-02-28 | 2023-03-28 | 中电装备山东电子有限公司 | Single-phase meter and carrier power supply undervoltage protection device |
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