CN218472782U - Low-power consumption charging protection circuit - Google Patents
Low-power consumption charging protection circuit Download PDFInfo
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- CN218472782U CN218472782U CN202221140894.0U CN202221140894U CN218472782U CN 218472782 U CN218472782 U CN 218472782U CN 202221140894 U CN202221140894 U CN 202221140894U CN 218472782 U CN218472782 U CN 218472782U
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Abstract
The utility model relates to a low-power consumption charging protection circuit connects in lithium battery charging circuit, include: the primary protection circuit is electrically connected with the lithium battery charging circuit and is provided with a primary circuit protection chip HTL6033; and the secondary protection circuit is electrically connected with the primary protection circuit and is provided with a secondary circuit protection chip CN3305, and the secondary circuit protection chip CN3305 is electrically connected with one pin of the primary circuit protection chip HTL 6033. Through adding secondary protection circuit on original one-level protection circuit, this secondary protection circuit utilizes secondary circuit protection chip CN3305 to realize multilayer overvoltage under-voltage protection, charge-discharge overcurrent protection and short-circuit protection to above-mentioned low-power consumption charge protection circuit, and normal operating current is less than when 30uA outage state is less than even is less than 1uA.
Description
Technical Field
The utility model relates to the technical field of circuits, especially, relate to a low-power consumption charging protection circuit.
Background
Nowadays, the integration level of a circuit board is higher and higher, the power consumption in the same unit area is also higher and higher, the price of the circuit board is more and more expensive, and the traditional lithium battery protection board is generally only subjected to primary protection; therefore, for each component on better protection lithium cell and the protection shield, promote the duration of battery powered, design a low-power consumption, a lithium cell protection shield that possess multistage protection becomes the demand in market now.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a low power consumption charging protection circuit for solving the problems of high power consumption and incomplete primary circuit protection of the conventional lithium battery protection circuit.
A low-power consumption charging protection circuit is connected in a lithium battery charging circuit, and comprises:
the primary protection circuit is electrically connected with the lithium battery charging circuit and is provided with a primary circuit protection chip HTL6033;
and the secondary protection circuit is electrically connected with the primary protection circuit and is provided with a secondary circuit protection chip CN3305, and the secondary circuit protection chip CN3305 is electrically connected with one pin of the primary circuit protection chip HTL 6033.
In one preferred embodiment, the secondary protection circuit further includes:
a source electrode of the first MOS tube is connected to a positive charging end of the lithium battery charging circuit, and a grid electrode of the first MOS tube is connected to an HDRV pin of the secondary circuit protection chip CN 3305;
the drain electrode of the second MOS tube is electrically connected with the drain electrode of the first MOS tube, the grid electrode of the second MOS tube is connected with the LDRV pin of the secondary circuit protection chip CN3305, and the source electrode of the second MOS tube is grounded;
and the first inductor is connected between the first MOS tube and the second MOS tube.
In one preferred embodiment, the secondary protection circuit further includes:
and the cathode of the second diode is connected between the drain electrode of the first MOS tube and the first inductor, and the anode of the second diode is grounded.
In one preferred embodiment, the secondary protection circuit further includes:
the anode of the first diode is connected between the first inductor and the second MOS tube, and the cathode of the first diode is electrically connected with the primary protection circuit;
one end of the third capacitor is connected to the cathode of the first diode, and the other end of the third capacitor is grounded;
and the fourth capacitor is connected with the third capacitor in parallel.
In one preferred embodiment, the BAT pin of the secondary circuit protection chip CN3305 is electrically connected to the negative electrode of the first diode, and the secondary protection circuit further includes:
the third resistor is connected between the BAT pin and the FB pin of the secondary circuit protection chip CN 3305;
one end of the fifth resistor is connected to the FB pin of the secondary circuit protection chip CN3305, and the other end is grounded.
In one preferred embodiment, the secondary protection circuit further includes:
the first resistor is connected between the source electrode of the first MOD tube and the positive charging end of the lithium battery charging circuit, and the CSN pin of the secondary circuit protection chip CN3305 is connected between the first resistor and the source electrode of the first MOD tube.
In one preferred embodiment, the secondary protection circuit further includes:
one end of the second resistor is connected to the positive charging end of the lithium battery charging circuit, and the VIN pin of the primary circuit protection chip HTL6033 is connected between the second resistor and the positive charging end of the lithium battery charging circuit;
the anode of the third light-emitting diode is connected with the second resistor;
one end of the fourth resistor is connected to the negative electrode of the third light-emitting diode, and the STAT pin of the secondary circuit protection chip CN3305 is connected between the fourth resistor and the negative electrode of the third light-emitting diode;
the anode of the third light-emitting diode is connected with the fourth resistor;
and the anode of the fourth light-emitting diode is connected to the fourth resistor, and the cathode of the fourth light-emitting diode is grounded.
In one of the preferred embodiments of the present invention,
one end of the first capacitor is connected to the positive charging end of the lithium battery charging circuit, and the other end of the first capacitor is grounded;
and the second capacitor is connected with the first capacitor in parallel.
The utility model discloses in the above-mentioned embodiment through add secondary protection circuit on original one-level protection circuit, this secondary protection circuit utilizes secondary circuit protection chip CN3305 to realize multilayer excessive pressure undervoltage protection to above-mentioned low-power consumption charging protection circuit, and charge-discharge overcurrent protection and short-circuit protection, normal operating current is less than 1uA when being less than 30uA power-off state even more.
Drawings
Fig. 1 is a schematic diagram of a module structure of a low power consumption charging protection circuit according to a preferred embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a secondary protection circuit of a low power consumption charging protection circuit according to a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.
As shown in fig. 1, a preferred embodiment of the present invention discloses a low power consumption charging protection circuit 100, which is connected to a lithium battery charging circuit, and the low power consumption charging protection circuit 100 includes a primary protection circuit 110 and a secondary protection circuit 120.
The primary protection circuit 110 is electrically connected to the lithium battery charging circuit, the primary protection circuit has a primary circuit protection chip U1, and the model of the primary circuit protection chip U1 is HTL6033;
the secondary protection circuit 120 is electrically connected to the primary protection circuit 110, the secondary protection circuit 120 has a secondary circuit protection chip U2, the model of the secondary circuit protection chip U2 is CN3305, and the secondary circuit protection chip CN3305 is electrically connected to one of pins of the primary circuit protection chip HTL 6033.
As shown in fig. 2, the secondary protection circuit 120 further includes a first MOS transistor Q1 and a second MOS transistor Q2, wherein a source of the first MOS transistor Q1 is connected to a positive charging terminal of the lithium battery charging circuit, and a gate of the first MOS transistor Q1 is connected to an HDRV pin of the secondary circuit protection chip U2;
the drain of the second MOS transistor Q2 is electrically connected to the drain of the first MOS transistor Q1, the gate of the second MOS transistor Q2 is connected to the LDRV pin of the secondary circuit protection chip CN3305, and the source of the second MOS transistor Q2 is grounded;
the first inductor L1 is connected between the first MOS transistor Q1 and the second MOS transistor Q2.
The secondary protection circuit 120 further includes a second diode D2, a cathode of the second diode D2 is connected between the drain of the first MOS transistor Q1 and the first inductor L1, and an anode of the second diode D2 is grounded.
In one preferred embodiment, the secondary protection circuit 120 further includes a first diode D1, a third capacitor C3, and a fourth capacitor C4, wherein the anode of the first diode D1 is connected between the first inductor L1 and the second MOS transistor, and the cathode of the first diode D1 is electrically connected to the primary protection circuit 110;
one end of the third capacitor C3 is connected to the negative electrode of the first diode D1, and the other end is grounded; the fourth capacitor C4 is connected in parallel with the third capacitor C3.
In one preferred embodiment, the BAT pin of the secondary circuit protection chip CN3305 is electrically connected to the negative electrode of the first diode, and the secondary protection circuit further includes:
the third resistor is connected between the BAT pin and the FB pin of the secondary circuit protection chip CN 3305;
and one end of the fifth resistor is connected to the FB pin of the secondary circuit protection chip CN3305, and the other end of the fifth resistor is grounded.
In one preferred embodiment, the secondary protection circuit further includes:
first resistance R1 connect in first MOD pipe Q1's source electrode with between lithium battery charging circuit's the positive charging end, and secondary circuit protection chip CN 3305's CSN pin connect in first resistance R1 with between first MOD pipe Q1's the source electrode.
In one preferred embodiment, the secondary protection circuit 120 further includes a second resistor R2, a third light emitting diode D3, a fourth resistor R4, a third light emitting diode D3, and a fourth light emitting diode D4.
One end of a second resistor R2 is connected to the positive charging end of the lithium battery charging circuit, and a VIN pin of the secondary circuit protection chip CN3305 is connected between the second resistor R2 and the positive charging end of the lithium battery charging circuit;
the anode of the third light emitting diode D3 is connected to the second resistor R2; one end of a fourth resistor R4 is connected to the negative electrode of the third light-emitting diode D3, and an STAT pin of the secondary circuit protection chip CN3305 is connected between the fourth resistor R4 and the negative electrode of the third light-emitting diode D3; the anode of the third light emitting diode D3 is connected to the fourth resistor R4; the anode of the fourth led D4 is connected to the fourth resistor R4, and the cathode of the fourth led D4 is grounded.
The secondary protection circuit 120 further includes a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 is connected to the positive charging end of the lithium battery charging circuit, and the other end is grounded; the second capacitor C2 is connected in parallel with the first capacitor C1.
The utility model discloses in the above-mentioned embodiment through add secondary protection circuit on original one-level protection circuit, this secondary protection circuit utilizes secondary circuit protection chip CN3305 to realize multilayer excessive pressure undervoltage protection to above-mentioned low-power consumption charging protection circuit, and charge-discharge overcurrent protection and short-circuit protection, normal operating current is less than 1uA when being less than 30uA power-off state even more.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. The utility model provides a low-power consumption charge protection circuit, connects in lithium battery charging circuit, its characterized in that includes:
the primary protection circuit is electrically connected to the lithium battery charging circuit and is provided with a primary circuit protection chip HTL6033;
and the secondary protection circuit is electrically connected with the primary protection circuit and is provided with a secondary circuit protection chip CN3305, and the secondary circuit protection chip CN3305 is electrically connected with one pin of the primary circuit protection chip HTL 6033.
2. The low-power-consumption charge protection circuit according to claim 1, wherein the secondary protection circuit further comprises:
the source electrode of the first MOS tube is connected to the positive charging end of the lithium battery charging circuit, and the grid electrode of the first MOS tube is connected to the HDRV pin of the secondary circuit protection chip CN 3305;
the drain electrode of the second MOS tube is electrically connected with the drain electrode of the first MOS tube, the grid electrode of the second MOS tube is connected with the LDRV pin of the secondary circuit protection chip CN3305, and the source electrode of the second MOS tube is grounded;
and the first inductor is connected between the first MOS tube and the second MOS tube.
3. The low power consumption charge protection circuit of claim 2, wherein the secondary protection circuit further comprises:
and the cathode of the second diode is connected between the drain electrode of the first MOS tube and the first inductor, and the anode of the second diode is grounded.
4. The low power consumption charge protection circuit of claim 2, wherein the secondary protection circuit further comprises:
the anode of the first diode is connected between the first inductor and the second MOS tube, and the cathode of the first diode is electrically connected with the primary protection circuit;
one end of the third capacitor is connected to the cathode of the first diode, and the other end of the third capacitor is grounded;
and the fourth capacitor is connected with the third capacitor in parallel.
5. The low power consumption charge protection circuit of claim 4, wherein the BAT pin of the secondary circuit protection chip CN3305 is electrically connected to the negative electrode of the first diode, and the secondary protection circuit further comprises:
the third resistor is connected between the BAT pin and the FB pin of the secondary circuit protection chip CN 3305;
and one end of the fifth resistor is connected to the FB pin of the secondary circuit protection chip CN3305, and the other end of the fifth resistor is grounded.
6. The low power consumption charge protection circuit of claim 2, wherein the secondary protection circuit further comprises:
the first resistor is connected between the source electrode of the first MOD tube and the positive charging end of the lithium battery charging circuit, and the CSN pin of the secondary circuit protection chip CN3305 is connected between the first resistor and the source electrode of the first MOD tube.
7. The low power consumption charge protection circuit of claim 1, wherein the secondary protection circuit further comprises:
one end of the second resistor is connected to the positive charging end of the lithium battery charging circuit, and the VIN pin of the primary circuit protection chip HTL6033 is connected between the second resistor and the positive charging end of the lithium battery charging circuit;
the anode of the third light-emitting diode is connected with the second resistor;
one end of the fourth resistor is connected to the negative electrode of the third light-emitting diode, and the STAT pin of the secondary circuit protection chip CN3305 is connected between the fourth resistor and the negative electrode of the third light-emitting diode;
the anode of the third light-emitting diode is connected with the fourth resistor;
and the anode of the fourth light-emitting diode is connected to the fourth resistor, and the cathode of the fourth light-emitting diode is grounded.
8. The low power consumption charge protection circuit of claim 1, wherein the secondary protection circuit further comprises:
one end of the first capacitor is connected to the positive charging end of the lithium battery charging circuit, and the other end of the first capacitor is grounded;
and the second capacitor is connected with the first capacitor in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221140894.0U CN218472782U (en) | 2022-05-12 | 2022-05-12 | Low-power consumption charging protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221140894.0U CN218472782U (en) | 2022-05-12 | 2022-05-12 | Low-power consumption charging protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218472782U true CN218472782U (en) | 2023-02-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221140894.0U Active CN218472782U (en) | 2022-05-12 | 2022-05-12 | Low-power consumption charging protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218472782U (en) |
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2022
- 2022-05-12 CN CN202221140894.0U patent/CN218472782U/en active Active
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