CN214586458U - Optional overcurrent threshold protection controller with resistance identification function - Google Patents
Optional overcurrent threshold protection controller with resistance identification function Download PDFInfo
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- CN214586458U CN214586458U CN202120289553.9U CN202120289553U CN214586458U CN 214586458 U CN214586458 U CN 214586458U CN 202120289553 U CN202120289553 U CN 202120289553U CN 214586458 U CN214586458 U CN 214586458U
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Abstract
The utility model discloses a selectable overcurrent threshold protection controller with resistance identification, which comprises a micro control unit, an identification resistance detection circuit, a current detection circuit and a discharge protection execution circuit; the identification resistance detection circuit consists of a first resistor, a second resistor, a third resistor, an external identification resistor and a first transistor, and the current detection circuit consists of an external discharge equipment load, an external switch, a sixth resistor and a simulation front end; the discharge protection execution circuit is composed of a fourth resistor, a fifth resistor and a discharge power device. The utility model discloses can avoid because of the single and too big unable effective protection of low-power motor stalling that leads to of overcurrent protection threshold value, lead to the problem that the motor burns out, also can avoid the problem that the high-power discharge apparatus that the overcurrent protection threshold value is single and the undersize leads to can't exert its normal performance, can effectively promote direct current electrical equipment's power consumption security, eliminate the potential safety hazard, extension direct current electrical equipment's life.
Description
Technical Field
The utility model belongs to the technical field of overload protection, a overcurrent protection circuit is related to, concretely relates to optional overcurrent threshold protection controller of electrified resistance discernment.
Background
Some special dc electrical appliances, such as low power hair dryer, high power circular saw, etc., usually encounter the following situations:
1. when a power supply discharges, the overcurrent protection threshold is single and overlarge, and the low-power motor is blocked and cannot be effectively protected, so that the motor is burnt;
2. when the power supply discharges, the overcurrent protection threshold is single and too small, and the high-power discharge equipment cannot exert the normal performance of the high-power discharge equipment.
The situations can bring potential safety hazards to the direct current electrical equipment, and the service life of the direct current electrical equipment is influenced.
SUMMERY OF THE UTILITY MODEL
To the problem that above-mentioned prior art exists, the utility model provides a take optional overcurrent threshold protection controller of resistance discernment to realize the adjustable function of overcurrent protection threshold value.
For solving the technical problem, realize above-mentioned technological effect, the utility model discloses a following technical scheme realizes:
a protection controller with resistance identification selectable overcurrent threshold comprises a micro control unit, an identification resistance detection circuit, a current detection circuit and a discharge protection execution circuit;
the identification resistance detection circuit consists of a first resistor, a second resistor, a third resistor, an external identification resistor and a first transistor, wherein the external identification resistor is positioned in the discharge equipment, and the first resistor, the second resistor, the third resistor and the first transistor are positioned in the battery pack;
the current detection circuit consists of an external discharge equipment load, an external switch, a sixth resistor and a simulation front end; the external discharge equipment load and the external switch are positioned in the discharge equipment, and the sixth resistor and the analog front end are positioned in the battery pack;
the discharge protection execution circuit consists of a fourth resistor, a fifth resistor and a discharge power device; the fourth resistor, the fifth resistor and the discharge power device are all positioned in a battery pack;
the first resistor is connected between an MCU power supply and the base electrode of the first transistor, the second resistor is connected between the low-power consumption control end of the micro control unit and the base electrode of the first transistor, the emitter of the first transistor is connected with the MCU power supply, the collector of the first transistor is connected with the second identification end of the battery pack, the external identification resistor of the micro control unit is connected with the detection end and the first identification end of the battery pack, two ends of the external identification resistor are respectively connected with the third identification end and the fourth identification end of the discharge equipment, the first identification end of the battery pack is in butt joint with the third identification end of the discharging device, the second identification end of the battery pack is in butt joint with the fourth identification end of the discharging device, the third resistor is connected between the external identification resistor access detection end of the micro control unit and the ground;
the external discharge equipment load and the external switch are connected between the positive electrode of the power input end and the negative electrode of the electrical input end of the discharge equipment in series, the LDO power output end of the analog front end is connected with the positive electrode of the power output end of the battery pack, and the load access detection end of the analog front end is connected with the power negative electrode output end of the battery pack; the positive electrode of the power supply input end of the discharging equipment is butted with the positive electrode of the power supply output end of the battery pack, and the negative electrode of the electrical input end of the discharging equipment is butted with the negative electrode output end of the power supply of the battery pack; the LDO power input end of the analog front end is connected with an MCU power supply, the LDO serial port communication end of the analog front end is connected with the MCU serial port communication end of the micro-control unit, and the MCU power input end of the micro-control unit is connected with the MCU power supply; the sixth resistor is connected between the source electrode of the discharge power device and the ground, a first current sampling end of the analog front end is connected with one end of the sixth resistor, and a second current sampling end of the analog front end is connected with the other end of the sixth resistor, so that a voltage drop sampling loop of the sixth resistor is formed;
the fourth resistor is connected between the grid of the discharging power device and the discharging protection control end of the micro control unit, the fifth resistor is connected between the grid of the discharging power device and the source of the discharging power device, the drain of the discharging power device is connected with the negative electrode of the power output end of the battery pack, the source of the discharging power device is connected with the other end of the sixth resistor, the positive electrode of the battery pack is connected with the positive electrode of the power output end of the battery pack, and the negative electrode of the battery pack is connected with one end of the sixth resistor.
Furthermore, the discharging equipment comprises a diode which is connected with the external discharging equipment in a negative parallel mode, the anode of the diode is connected with the anode of the power input end of the discharging equipment, and the cathode of the diode is connected with the cathode of the power input end of the discharging equipment.
Further, the positive and power negative output of power output end of battery package and first discernment end and the second discernment end of battery package all adopt public inserted sheet to follow draw forth on the casing of battery package, the positive and electric input end negative pole of power input end of discharge apparatus and third discernment end and the fourth discernment end of discharge apparatus all adopt female inserted sheet to follow draw forth on the casing of discharge apparatus.
When an external identification resistor in the discharge equipment is connected, the micro control unit automatically selects a corresponding preset current protection threshold value, judges whether protection is needed or not by sampling and amplifying a current signal at the analog front end, and then controls a discharge power device switch to execute a corresponding protection action; and the micro control unit turns off the first transistor by detecting the low-power consumption control end of the micro control unit after the discharge protection action is executed, so that the peripheral detection circuit of the micro control unit enters a low-power consumption state after the micro control unit is turned off.
The utility model has the advantages that:
the utility model discloses can be when discharge apparatus inserts the power, through the identification resistance among the detection discharge apparatus, the current threshold value of adjustment overcurrent protection, thereby can avoid because of the single and too big unable effective protection of low-power motor stalling that leads to of overcurrent protection threshold value, the problem that leads to the motor to burn out, also can avoid the single and too little problem that can't exert its normal performance of high-power discharge apparatus that leads to of overcurrent protection threshold value, can effectively promote direct current electrical equipment's power consumption security, eliminate the potential safety hazard, the life of extension direct current electrical equipment, the problem of single power match incessant power discharge apparatus to performance and protection validity difference has been solved simultaneously.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings. The detailed description of the present invention is given by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is a schematic circuit diagram of the present invention;
fig. 2 is a logic block diagram of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. The description as set forth herein is intended to provide a further understanding of the invention and forms a part of this application and the exemplary embodiments and descriptions thereof are presented for purposes of illustration and description and are not intended to limit the invention in any way.
Referring to fig. 1, the optional overcurrent threshold protection controller with resistance identification comprises a micro-control unit U1, an identification resistance detection circuit, a current detection circuit and a discharge protection execution circuit;
the identification resistance detection circuit consists of a first resistor R1, a second resistor R2, a third resistor R3, an external identification resistor RID and a first transistor Q1, wherein the external identification resistor RID is positioned in the discharge device 2, and the first resistor R1, the second resistor R2, the third resistor R3 and the first transistor Q1 are positioned in the battery pack 1;
the current detection circuit consists of an external discharge equipment load M, an external switch S1, a sixth resistor R6 and a simulation front end U2; wherein the external discharging device load M and the external switch S1 are located in the discharging device 2, and the sixth resistor R6 and the analog front end U2 are located in the battery pack 1;
the discharge protection execution circuit consists of a fourth resistor R4, a fifth resistor R5 and a discharge power device Q2; the fourth resistor R4, the fifth resistor R5 and the discharge power device Q2 are all located in the battery pack 1;
the first resistor R1 is connected between an MCU power VCC and a base of the first transistor Q1, the second resistor R2 is connected between a low power consumption control terminal U1-3 of the micro control unit U1 and a base of the first transistor Q1, an emitter of the first transistor Q1 is connected with the MCU power VCC, a collector of the first transistor Q1 is connected with the second identification terminal ID2 of the battery pack 1, an external identification resistor access detection terminal U1-4 of the micro control unit U1 is connected with the first identification terminal ID1 of the battery pack 1, two ends of the external identification resistor RID are respectively connected with the third identification terminal ID3 and the fourth identification terminal ID4 of the discharging device 2, the first identification terminal ID1 of the battery pack 1 is butted with the third identification terminal ID3 of the discharging device 2, the second identification terminal ID2 of the battery pack 1 is butted with the fourth identification terminal ID4 of the discharging device 2, the third resistor R3 is connected between the external identification resistor access detection terminal U1-4 of the micro control unit U1 and the ground GND;
the external discharging equipment load M and the external switch S1 are connected in series between the positive pole P + of the power input end and the negative pole P-of the electrical input end of the discharging equipment 2, the LDO power output end U2-1 of the analog front end U2 is connected with the positive pole B + of the power output end of the battery pack 1, and the load access detection end U2-2 of the analog front end U2 is connected with the negative pole output end B-of the power of the battery pack 1; the anode P + of the power supply input end of the discharge device 2 is butted with the anode B + of the power supply output end of the battery pack 1, and the cathode P-of the electrical input end of the discharge device 2 is butted with the cathode B-of the power supply output end of the battery pack 1; an LDO power input end U2-3 of the analog front end U2 is connected with an MCU power VCC, an LDO serial port communication end U2-4 of the analog front end U2 is connected with an MCU serial port communication end U1-1 of the micro control unit U1, and an MCU power input end U1-2 of the micro control unit U1 is connected with the MCU power VCC; the sixth resistor R6 is connected between the source of the discharge power device Q2 and the ground GND, the first current sampling terminal U2-5 of the analog front end U2 is connected with one end of the sixth resistor R6, and the second current sampling terminal U2-6 of the analog front end U2 is connected with the other end of the sixth resistor R6, so as to form a voltage drop sampling loop for the sixth resistor R6;
the fourth resistor R4 is connected between the gate of the discharging power device Q2 and the discharging protection control end U1-5 of the micro control unit U1, the fifth resistor R5 is connected between the gate of the discharging power device Q2 and the source of the discharging power device Q2, the drain of the discharging power device Q2 is connected with the negative electrode B-of the power output end of the battery pack 1, the source of the discharging power device Q2 is connected with the other end of the sixth resistor R6, the positive electrode of the battery pack 1 is connected with the positive electrode B + of the power output end of the battery pack 1, and the negative electrode of the battery pack 1 is connected with one end of the sixth resistor R6.
Further, the discharge device 2 includes a diode D1 connected in parallel with the external discharge device load M, the anode of the diode D1 is connected to the anode P + of the power input terminal of the discharge device 2, and the cathode of the diode D1 is connected to the cathode P-of the power input terminal of the discharge device 2.
Further, the anodal B + of power output end and the power negative output end B-of battery package 1 and first discernment end ID1 and the second discernment end ID2 of battery package 1 all adopt public inserted sheet to follow draw forth on the casing of battery package 1, the anodal P + of power input end and the electric input end negative pole P of discharge apparatus 2 and third discernment end ID3 and fourth discernment end ID4 of discharge apparatus 2 all adopt female inserted sheet to follow draw forth on the casing of discharge apparatus 2.
When an external identification resistor RID in the discharge device 2 is connected, the micro control unit U1 automatically selects a corresponding preset current protection threshold, the micro control unit U1 judges whether protection is needed or not by sampling and amplifying a current signal of the analog front end U2, and then the corresponding protection action is executed by controlling a switch of a discharge power device Q2; after the discharge protection action is executed, the micro control unit U1 turns off the first transistor Q1 by detecting the low-power control end U1-3 thereof, so that the peripheral detection circuit of the micro control unit U1 enters a low-power state after the micro control unit U1 is turned off.
Referring to fig. 2, the control logic for the over-current protection of the present invention is as follows:
1. inserting the discharging device 2 into the battery pack 1, and then closing the external switch S1, wherein the anode and the cathode of the power supply and the external identification resistor RID are connected in sequence;
2. firstly, the analog front end U2 is powered on, and then the micro control unit U1 is powered on;
3. the micro-control unit U1 detects whether the resistance value of the external identification resistor RID is normal;
4. if the resistance value of the external identification resistor RID is normal, the micro control unit U1 starts to identify the types of the accessed external identification resistor RID one by one, and judges whether the external identification resistor RID is one of the identification resistors N1, N2,. NX;
5. after the identification is finished, the micro control unit U1 sets the current threshold value to be corresponding A1, A2,. or AX according to the identified type of the external identification resistor RID;
6. the micro-control unit U1 controls the discharge power device Q2 to be turned on, and detects the current I;
7. if the detected current I is not larger than the set current threshold or does not meet the delay condition, detecting the current again;
8. if the detected current I is larger than the set current threshold and meets the delay condition, the micro control unit U1 sends out an overcurrent protection signal to turn off the discharge power device Q2, so that the over-current protection state is entered;
9. if the resistance value of the external identification resistor RID is abnormal, the micro control unit U1 turns off the discharge power device Q2, so that the power-on protection state is achieved;
10. then the micro control unit U1 automatically enters a sleep state without output;
11. the micro control unit U1 judges whether the external switch S1 in the discharging device 2 is disconnected or not by sensing whether the power supply cathode output end B-of the battery pack 1 is low or not;
12. if the micro control unit U1 determines that the external switch S1 is not turned off, the micro control unit U1 is still in the sleep state without output; if the micro control unit U1 judges that the external switch S1 is disconnected, the micro control unit U1 controls the analog front end U2 to be powered off;
13. finally, the micro control unit U1 is self powered down.
From the above description, the utility model discloses can the discharge apparatus when inserting the power, through the identification resistance among the detection discharge apparatus, the adjustment current threshold value of overcurrent protection, thereby can avoid because of the single and too big unable effective protection of low-power motor stalling that leads to of overcurrent protection threshold value, the problem that leads to the motor to burn out, also can avoid the single and too little problem that can't exert its normal performance of high-power discharge apparatus that leads to of overcurrent protection threshold value, can effectively promote direct current electrical equipment's power consumption security, eliminate the potential safety hazard, the life of extension direct current electrical equipment, the problem of single power matching uninterrupted power discharge apparatus to performance and protection validity difference has been solved simultaneously.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The utility model provides a take optional overcurrent threshold protection controller of resistance discernment which characterized in that: the device comprises a micro-control unit (U1), an identification resistance detection circuit, a current detection circuit and a discharge protection execution circuit;
the identification resistance detection circuit consists of a first resistor (R1), a second resistor (R2), a third resistor (R3), an external identification Resistor (RID) and a first transistor (Q1), wherein the external identification Resistor (RID) is positioned in a discharge device (2), and the first resistor (R1), the second resistor (R2), the third resistor (R3) and the first transistor (Q1) are positioned in a battery pack (1);
the current detection circuit consists of an external discharge equipment load (M), an external switch (S1), a sixth resistor (R6) and a simulation front end (U2); wherein the offboard discharge device load (M) and the offboard switch (S1) are located in a discharge device (2), the sixth resistor (R6) and the analog front end (U2) are located in a battery pack (1);
the discharge protection execution circuit is composed of a fourth resistor (R4), a fifth resistor (R5) and a discharge power device (Q2); wherein the fourth resistor (R4), the fifth resistor (R5) and the discharge power device (Q2) are all located in a battery pack (1);
the first resistor (R1) is connected between a MCU power supply (VCC) and the base of the first transistor (Q1), the second resistor (R2) is connected between a low power consumption control terminal (U1-3) of the micro control unit (U1) and the base of the first transistor (Q1), the emitter of the first transistor (Q1) is connected with the MCU power supply (VCC), the collector of the first transistor (Q1) is connected with the second identification terminal (ID 2) of the battery pack (1), the external identification resistor access detection terminal (U1-4) of the micro control unit (U1) is connected with the first identification terminal (ID 1) of the battery pack (1), the two terminals of the external identification Resistor (RID) are respectively connected with the third identification terminal (ID 3) and the fourth identification terminal (ID 4) of the discharge device (2), the first identification terminal (ID 1) of the battery pack (1) is connected with the third identification terminal (ID 3) of the discharge device (ID 4), the second identification terminal (ID 2) of the battery pack (1) is butted with the fourth identification terminal (ID 4) of the discharge device (2), and the third resistor (R3) is connected between the external identification resistor access detection terminal (U1-4) of the micro control unit (U1) and the Ground (GND);
the external discharging equipment load (M) and the external switch (S1) are connected in series between the positive pole (P +) of the power input end and the negative pole (P-) of the electrical input end of the discharging equipment (2), the LDO power output end (U2-1) of the analog front end (U2) is connected with the positive pole (B +) of the power output end of the battery pack (1), and the load access detection end (U2-2) of the analog front end (U2) is connected with the negative pole output end (B-) of the power supply of the battery pack (1); the positive pole (P +) of the power input end of the discharging device (2) is butted with the positive pole (B +) of the power output end of the battery pack (1), and the negative pole (P-) of the electrical input end of the discharging device (2) is butted with the negative pole (B-) of the power output end of the battery pack (1); an LDO power input end (U2-3) of the analog front end (U2) is connected with an MCU power supply (VCC), an LDO serial port communication end (U2-4) of the analog front end (U2) is connected with an MCU serial port communication end (U1-1) of the micro control unit (U1), and an MCU power input end (U1-2) of the micro control unit (U1) is connected with the MCU power supply (VCC); the sixth resistor (R6) is connected between the source of the discharge power device (Q2) and the Ground (GND), the first current sampling end (U2-5) of the analog front end (U2) is connected with one end of the sixth resistor (R6), and the second current sampling end (U2-6) of the analog front end (U2) is connected with the other end of the sixth resistor (R6) to form a voltage drop sampling loop for the sixth resistor (R6);
the fourth resistor (R4) is connected between the gate of the discharge power device (Q2) and a discharge protection control terminal (U1-5) of the micro-control unit (U1), the fifth resistor (R5) is connected between the gate of the discharge power device (Q2) and the source of the discharge power device (Q2), the drain of the discharge power device (Q2) is connected with the negative pole (B-) of the power output terminal of the battery pack (1), and the source of the discharge power device (Q2) is connected with the sixth resistor (R6).
2. The optional overcurrent threshold protection controller with resistor identification of claim 1, wherein: the discharging device (2) comprises a diode (D1) connected with the external discharging device load (M) in parallel, the anode of the diode (D1) is connected with the anode (P +) of the power input end of the discharging device (2), and the cathode of the diode (D1) is connected with the cathode (P-) of the power input end of the discharging device (2).
3. The optional overcurrent threshold protection controller with resistor identification of claim 1, wherein: the battery pack is characterized in that a power output end positive electrode (B +) and a power negative output end (B-) of the battery pack (1) and a first identification end (ID 1) and a second identification end (ID 2) of the battery pack (1) are both led out from a shell of the battery pack (1) by adopting male insertion pieces, a power input end positive electrode (P +) and an electric input end negative electrode (P-) of the discharging device (2) and a third identification end (ID 3) and a fourth identification end (ID 4) of the discharging device (2) are both led out from the shell of the discharging device (2) by adopting female insertion pieces.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120289553.9U CN214586458U (en) | 2021-02-02 | 2021-02-02 | Optional overcurrent threshold protection controller with resistance identification function |
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| CN202120289553.9U CN214586458U (en) | 2021-02-02 | 2021-02-02 | Optional overcurrent threshold protection controller with resistance identification function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116388116A (en) * | 2023-04-20 | 2023-07-04 | 深圳市乐祺微电子科技有限公司 | Automatic discernment electric tool type sets up overcurrent protection parameter circuit |
| CN116388116B (en) * | 2023-04-20 | 2024-05-14 | 深圳市乐祺微电子科技有限公司 | Automatic discernment electric tool type sets up overcurrent protection parameter circuit |
-
2021
- 2021-02-02 CN CN202120289553.9U patent/CN214586458U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116388116A (en) * | 2023-04-20 | 2023-07-04 | 深圳市乐祺微电子科技有限公司 | Automatic discernment electric tool type sets up overcurrent protection parameter circuit |
| CN116388116B (en) * | 2023-04-20 | 2024-05-14 | 深圳市乐祺微电子科技有限公司 | Automatic discernment electric tool type sets up overcurrent protection parameter circuit |
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