CN220830321U - Positive current detection circuit - Google Patents
Positive current detection circuit Download PDFInfo
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- CN220830321U CN220830321U CN202321881975.0U CN202321881975U CN220830321U CN 220830321 U CN220830321 U CN 220830321U CN 202321881975 U CN202321881975 U CN 202321881975U CN 220830321 U CN220830321 U CN 220830321U
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Abstract
The utility model discloses a positive current detection circuit, which comprises a current detection circuit, wherein the current detection circuit comprises a power circuit module, a current detection module and a current sampling module, an external power supply of the current detection circuit charges a battery through 3 parallel charging circuits, the power circuit is responsible for supplying power to the current detection circuit, the power detection circuit acquires weak signals from a detection resistor, amplifies the weak signals and sends the weak signals to other circuits or sends the weak signals to a CPU for calculation, the power circuit module is taken from a storage battery and mainly supplies power to the current detection module, the current detection module acquires weak voltage signals from the current sampling module, processes the weak voltage signals by a method and sends the weak voltage signals to a subsequent circuit or an MCU for further processing, and the detection circuit can solve the current detection problem of the detection resistor under the positive condition of the circuit, and is applicable no matter the detection resistor is arranged at the input end of the charging circuit or the output end of the charging circuit.
Description
Technical Field
The utility model relates to the technical field of signal processing application, in particular to a positive current detection circuit.
Background
In various high-power charging circuits, the charging is generally performed by adopting a multi-path control mode, and the multi-path control mode has the following advantages:
1: the branch current is reduced, taking 3 branches as an example, and each current can become 1/3 of the original current.
2: The requirement of components (such as detection resistor, MOS tube, energy storage inductor, etc.) is reduced, and this is especially suitable for the place that has higher requirement to the product volume.
3: The redundancy of the system is improved, and when a certain road fails, the system cannot work and only the performance is reduced.
4: By adopting a special algorithm (for example, 3 charging circuits work in turn according to a phase difference of 120 degrees), the requirement on the front-stage power supply is reduced, and the output change of the front-stage power supply is gentle.
The charging is performed by adopting a multi-path control mode, the detected current is the current of each branch rather than the total current, otherwise, the working state of each charging circuit cannot be detected, so that the position where the detection resistor is arranged is the positive electrode of the power supply, and the general detection means cannot meet the requirements, so that an improved technology is needed to solve the problem in the prior art.
Disclosure of utility model
The present utility model is directed to a positive current detection circuit that can solve the current detection problem in the positive state of the circuit in which the detection resistor is placed, and that can be applied to both the input terminal of the charging circuit and the output terminal of the charging circuit, so as to solve the problems set forth in the background art.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the positive current detection circuit comprises a current detection circuit, wherein the current detection circuit comprises a current sampling module, a power circuit module and a current detection module,
The current detection circuit is provided with a charging circuit A, a charging circuit B and a charging circuit C, the charging circuit A, the charging circuit B and the charging circuit C are mutually connected in parallel, one ends of the charging circuit A, the charging circuit B and the charging circuit C are connected with a POWER+ end, one end of the charging circuit A is connected with a resistor RS1, one end of the charging circuit B is connected with a resistor RS2, one end of the charging circuit C is connected with a resistor RS3, the other ends of the charging circuit A, the charging circuit B and the charging circuit C are connected with a POWER circuit module, the other end of the POWER circuit module is connected with a current detection module, and the other end of the current detection module is connected with an output module.
Preferably, a current sampling module on the current detection circuit is arranged at the positive electrode of the circuit, and the current sampling module comprises a resistor RS1, a resistor RS2 and a resistor RS3;
The resistor RS1, the resistor RS2 and the resistor RS3 form a current sampling loop circuit, the RS1 is connected with the charging circuit A and the positive electrode of the storage battery, the RS2 is connected with the charging circuit B and the positive electrode of the storage battery, the RS3 is connected with the charging circuit 3 and the positive electrode of the storage battery, and in actual application, the loop number of the charging circuit can be determined according to actual needs.
Preferably, the power circuit module includes a capacitor C49, a capacitor C48, a resistor R76, a regulator D14, a PNP transistor Q29, and a power management chip 79L05;
the capacitor C49 is connected in parallel with the 2 end of the storage battery, the cathode of the voltage stabilizing tube D14 is connected with the anode of the storage battery, the anode of the voltage stabilizing tube D14 is connected with the base electrode of the PNP transistor Q29, the resistor R76 is connected in parallel with the base electrode and the collector electrode of the PNP transistor Q29, the base electrode of the PNP transistor Q29 is connected with the anode of the voltage stabilizing tube D14, the emitter electrode of the PNP transistor Q29 is connected with the PIN3 of the 79L05, the collector electrode of the storage battery is connected with the collector electrode of the storage battery, the PIN1 of the power management chip 79L05 is connected with the collector electrode of the Q29, the PIN3 of the power management chip 79L05 is connected with the PIN11 of the operational amplifier U5U5 of the Q29.
Preferably, the current detection module includes a resistor R57, a resistor R59, a resistor R62, a resistor R16, a capacitor C40, a capacitor C41, a PNP transistor Q26, and an operational amplifier U5.
The resistor R57, the resistor R59 and the capacitor C40 form a signal filtering loop, the operational amplifier U5, the capacitor C41 and the PNP triode Q26 form a simple constant current source circuit, the resistor R62 and the resistor R16 form a voltage dividing circuit, the resistor R57 is connected with the high-level end of the detection resistor RS3 and the opposite end of the operational amplifier U5, the resistor R59 is connected with the low-level end of the detection resistor RS3 and the same-direction end of the operational amplifier U5, the capacitor C40 is connected in parallel with the opposite end and the same-direction end of the operational amplifier U5, the base electrode of the PNP triode Q26 is connected with the PIN1 of the operational amplifier U5, the collector electrode of the PNP triode Q26 is connected with the opposite end of the operational amplifier U5, the emitter electrode of the PNP triode Q26 is connected with the resistor R62, the cathode of the PIN11 of the operational amplifier U5 is connected with the output PIN3 of the U8, the PIN4 of the operational amplifier U5 is connected with the storage battery, the resistor R62 is connected with the emitter of the PNP triode Q26 and the cathode of the storage battery.
Compared with the prior art, the utility model has the beneficial effects that:
(1) In practical application, the current detection circuit can determine the number of loops of the charging circuit according to practical requirements, can decompose large current into loop current, greatly reduces the choice of the detection resistor, and can properly raise the resistance value of the detection resistor so as to enable the current detection of each loop to be more accurate;
(2) The current sampling module is essentially an anode current detection circuit, and the power supply circuit module is taken from a storage battery and mainly supplies power to the current detection module; the current detection module acquires a weak voltage signal from the current sampling module, processes the weak voltage signal by a method and sends the weak voltage signal to a subsequent circuit or MCU for further processing;
(3) The detection circuit can solve the current detection problem of the detection resistor placed at the positive electrode of the circuit, and is applicable to both the input end of the charging circuit and the output end of the charging circuit.
Drawings
FIG. 1 is a schematic diagram of a current detection circuit according to the present utility model;
Fig. 2 is a schematic diagram of a circuit topology of the present utility model.
In the figure: 1. a current detection circuit; 2. a charging circuit A; 3. a charging circuit B; 4. a charging circuit C; 5. a current detection circuit; 6. and a power circuit module.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-2, the present utility model provides a technical solution: the utility model provides an anodal current detection circuit, includes current detection circuit 1, including current sampling module on the current detection circuit 1, POWER supply circuit module 6, current detection module 5 are equipped with charging circuit A2, charging circuit B3, charging circuit C4 on the current detection circuit, charging circuit A2, charging circuit B3, charging circuit C4 are parallelly connected each other, and charging circuit A2, charging circuit B3, charging circuit C4's one end all inserts POWER+ end, and charging circuit A2's one end inserts resistance RS1, and charging circuit B3's one end inserts resistance RS2, charging circuit C4's one end inserts resistance RS3, charging circuit A2, charging circuit B3, charging circuit C4's the other end all inserts POWER supply circuit module 6, the other end of POWER supply circuit module 6 inserts current detection module 5, and the another output module of current detection module 5.
The current sampling module is placed in the positive pole of circuit on the current detection circuit 1, and the current sampling module includes resistance RS1, resistance RS2, resistance RS3, resistance RS1, resistance RS2, resistance RS3 constitute current sampling loop circuit, and charging circuit A and the positive pole of battery are connected to RS1, and charging circuit B and the positive pole of battery are connected to RS2, and charging circuit 3 and the positive pole of battery are connected to RS3, in practical application, can confirm charging circuit's circuit number according to actual need, can decompose the heavy current into 3 way electric currents, reduces greatly to the selection scope of detection resistance, can suitably raise the resistance value of detection resistance so that the electric current detection of every way is more accurate.
The current sampling module is essentially an anode current detection circuit, and the power supply circuit module is taken from a storage battery and mainly supplies power to the current detection module; the current detection module acquires a weak voltage signal from the current sampling module, processes the weak voltage signal by a method and sends the weak voltage signal to a subsequent circuit or MCU for further processing.
The power circuit module 6 comprises a capacitor C49, a capacitor C48, a resistor R76, a voltage stabilizing tube D14, a PNP (plug and play) transistor Q29 and a power management chip 79L05, wherein the capacitor C49 and the capacitor C48 are filter capacitors, and mainly provide filtering action for the input and the output of the power circuit, the voltage stabilizing tube D14, the resistor R76 and the PNP transistor Q29 are voltage reducing circuits, and mainly reduce the voltage of the BAT to BAT-7.5V, provide a primary voltage source of BAT-7.5V for 79L05, reduce the load of the power management chip 79L05, and the power management chip 79L05 converts the voltage source of BAT-7.5V to provide a high-precision BAT-5V power supply.
The power circuit module 6 can provide a BAT-5V reference voltage for the operational amplifier U5, and the power terminals PIN4 and P11 of the operational amplifier are matched with the BAT voltage, namely, a stable 5V power supply is provided, so that the operational amplifier can work normally.
The operational amplifier U5 cannot directly supply power in a 5V-GND mode, because the in-phase end and the anti-phase end of the operational amplifier U5 are both from the positive electrode of the storage battery, the voltage is higher than 5V, so that the positive electrode of the power supply of the operational amplifier U5 can only be connected with BAT+, because the BAT+ voltage is higher, a product adopting the detection circuit is usually a high-voltage high-power charging system, and the negative electrode of the power supply of the operational amplifier U5 exceeds the limit voltage of the operational amplifier U5 if the negative electrode is directly grounded, so that a reference voltage needs to be introduced into the negative electrode of the power supply of the operational amplifier U5, the reference voltage changes along with the change of the BAT+, but the voltage difference between the positive electrode and the negative electrode of the power supply of the operational amplifier U5 is unchanged, and the power supply scheme is the optimal way for solving the problem.
Capacitor C49 connects in parallel at the 2 ends of battery, the positive pole of battery is connected to the negative pole of steady voltage tube D14, the base of PNP triode Q29 is connected to the positive pole of steady voltage tube D14, resistance R76 connects in parallel at the base and the collector of PNP triode Q29, the positive pole of steady voltage tube D14 is connected to the base of PNP triode Q29, the PIN3 of 79L05 is connected to the projecting pole of PNP triode Q29, the negative pole of battery is connected to the collecting electrode of PNP triode Q29, the positive pole of battery is connected to the PIN1 of power management chip 79L05, the collecting electrode of Q29 is connected to the PIN2 of power management chip 79L05, the PIN11 of operational amplifier U5 of Q29 is connected to the PIN3 of power management chip 79L 05.
The current detection module 5 comprises a resistor R57, a resistor R59, a resistor R62, a resistor R16, a capacitor C40, a capacitor C41 and a PNP triode Q26, wherein the resistor R57, the resistor R59 and the capacitor C40 form a signal filtering loop, the operational amplifier U5, the capacitor C41 and the PNP triode Q26 form a simple constant current source circuit, the resistor R62 and the resistor R16 form a voltage dividing circuit, the resistor R57 is connected with the high-level end of the detection resistor RS3 and the reverse end of the operational amplifier U5, the resistor R59 is connected with the low-level end of the detection resistor RS3 and the same-direction end of the operational amplifier U5, the capacitor C40 is connected in parallel with the reverse end and the same-direction end of the operational amplifier U5, the base electrode of the PNP triode Q26 is connected with the PIN1 of the operational amplifier U5, the collector of the PNP triode Q26 is connected with the reverse end of the operational amplifier U5, the emitter electrode of the PNP triode Q26 is connected with the resistor R62, the cathode of the PIN11 of the operational amplifier U5 is connected with the output PIN3 of a power supply of the operational amplifier U5, the PNP triode Q4 is connected with the resistor R62, and the storage battery Q16 is connected with the resistor R16.
The current detection module can amplify the small voltage signal on the RS3 and then output the small voltage signal for other circuits or MCU.
The working mode of the circuit is as follows:
Assuming that the current through the current sense resistor RS3 is I, the circuit analysis is described as follows
When current flows in RS3, V13 (13 PINs of U5) > V12 (12 PINs of U5), the comparator outputs a low level (v11) v11=vbat-5V, the comparator outputs a low level, the ground level of the comparator is the level of PIN12 PIN of the comparator, VBAT-5V, after not GND, PNP transistor Q26 is turned on, assuming that PNP transistor Q26 is all turned on, a voltage drop is formed across resistor R57, the voltage drop is r57×i1, i1=bat+r3×i/(r57+r62+r16), and at this time the voltage drop of R57 is: r57/(r57+r62+r16) (bat+r3×i), if the ratio of R57/(r57+r62+r16) is too large, this will lead to the condition of R57/(r57+r62+r16) (bat+r3×i) < RS3×i, which should be avoided as much as possible.
When the PNP transistor Q26 is fully turned on, the voltage drop across the resistor R51 is higher than the voltage drop across the resistor RS3, V13 (pin 13 of U5) < V12 (pin 12 of U5), the comparator outputs a high level, and the PNP transistor Q25 is turned off.
After the PNP triode Q26 is turned off, V13 (13 pins of U5) > V12 (12 pins of U5), the comparator outputs a low level, and the PNP triode Q26 is turned on.
And the circuit is repeated until the switch of the PNP triode Q26 is in a certain balance state.
Analysis of the state of balance of an electrical circuit
From the analysis just described, a conclusion bit can be reached: when V13> V12, the PNP transistor Q25 is turned on, which results in voltage drop of V13, when V13< V12 when the PNP transistor Q25 is turned on, the PNP transistor Q25 is turned off, voltage of V13 rises, and the final balance point is v12=v13.
Since the PNP transistor Q26 is neither fully on nor fully off, and therefore the analysis is not regarded as a constant current source, since in the initial state V13 is higher than V12 by RS3, or as long as the voltage drop across the resistor R57 is ensured to be RS3, the amplifier U5 is in the balanced state, the current through the PNP transistor Q26 is assumed to be I1, which is: i1 =rs 3I/R57, then the voltage developed across ad_c3 is: vad_c3=r16×r3×i/R57, therefore, when other parameters in the circuit are fixed, the relationship between the output voltage (vad_c3) and the input current (I) is: vad_c3= (r16×rs 3/r57) ×i.
The ratio of R62+ R16 to R57 is smaller than the ratio of the load resistor to the sense resistor (when the current is maximum), if the ratio of R62+ R16/R57 is too large, meaning that even if PNP transistor Q26 is fully on, the voltage drop across resistor R57 is smaller than the voltage drop across resistor RS3, and therefore the power supply voltage of the comparator is generally the same as Vbat, in this case, the voltage of Vbat can be up to 60V, if the 11 pin of the comparator is directly connected to GND, the comparator will be damaged.
The detection circuit can solve the current detection problem of the detection resistor placed at the positive electrode of the circuit, and is applicable to both the input end of the charging circuit and the output end of the charging circuit.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The positive current detection circuit comprises a current detection circuit (1), and is characterized in that: the current detection circuit (1) comprises a current sampling module, a power circuit module (6) and a current detection module (5),
The charging circuit is characterized in that a charging circuit A (2), a charging circuit B (3) and a charging circuit C (4) are arranged on the current detection circuit, the charging circuit A (2), the charging circuit B (3) and the charging circuit C (4) are connected in parallel, one end of the charging circuit A (2), the charging circuit B (3) and one end of the charging circuit C (4) are connected with the POWER+ end, one end of the charging circuit A (2) is connected with the resistor RS1, one end of the charging circuit B (3) is connected with the resistor RS2, one end of the charging circuit C (4) is connected with the resistor RS3, the other ends of the charging circuit A (2), the charging circuit B (3) and the charging circuit C (4) are connected with the POWER circuit module (6), the other end of the POWER circuit module (6) is connected with the current detection module (5), and the other end of the current detection module (5) is connected with the output module.
2. The positive electrode current detection circuit according to claim 1, wherein: the current sampling module on the current detection circuit (1) is arranged at the positive electrode of the circuit, and comprises a resistor RS1, a resistor RS2 and a resistor RS3;
The resistor RS1, the resistor RS2 and the resistor RS3 form a current sampling loop circuit, the RS1 is connected with the charging circuit A and the anode of the storage battery, the RS2 is connected with the charging circuit B (3) and the anode of the storage battery, the RS3 is connected with the charging circuit B (3) and the anode of the storage battery, and in actual application, the loop number of the charging circuit can be determined according to actual requirements.
3. The positive electrode current detection circuit according to claim 1, wherein: the power circuit module (6) comprises a capacitor C49, a capacitor C48, a resistor R76, a voltage stabilizing tube D14, a PNP transistor Q29 and a power management chip 79L05;
The capacitor C49 is connected in parallel with the 2 end of the storage battery, the cathode of the voltage stabilizing tube D14 is connected with the anode of the storage battery, the anode of the voltage stabilizing tube D14 is connected with the base electrode of the PNP transistor Q29, the resistor R76 is connected in parallel with the base electrode and the collector electrode of the PNP transistor Q29, the base electrode of the PNP transistor Q29 is connected with the anode of the voltage stabilizing tube D14, the emitter electrode of the PNP transistor Q29 is connected with the PIN3 of the power management chip 79L05, the collector electrode of the storage battery is connected with the collector electrode of the storage battery, the PIN1 of the power management chip 79L05 is connected with the anode of the storage battery, the PIN2 of the power management chip 79L05 is connected with the collector electrode of the Q29, and the PIN3 of the power management chip 79L05 is connected with the PIN11 of the operational amplifier U5 of the Q29.
4. The positive electrode current detection circuit according to claim 1, wherein: the current detection module (5) comprises a resistor R57, a resistor R59, a resistor R62, a resistor R16, a capacitor C40, a capacitor C41, a PNP triode Q26 and an operational amplifier U5;
The resistor R57, the resistor R59 and the capacitor C40 form a signal filtering loop, the operational amplifier U5, the capacitor C41 and the PNP triode Q26 form a simple constant current source circuit, the resistor R62 and the resistor R16 form a voltage dividing circuit, the resistor R57 is connected with the high-level end of the detection resistor RS3 and the opposite end of the operational amplifier U5, the resistor R59 is connected with the low-level end of the detection resistor RS3 and the same-direction end of the operational amplifier U5, the capacitor C40 is connected in parallel with the opposite end and the same-direction end of the operational amplifier U5, the base electrode of the PNP triode Q26 is connected with the PIN1 of the operational amplifier U5, the collector electrode of the PNP triode Q26 is connected with the opposite end of the operational amplifier U5, the emitter electrode of the PNP triode Q26 is connected with the resistor R62, the cathode of the PIN11 of the operational amplifier U5 is connected with the output PIN3 of the U8, the PIN4 of the operational amplifier U5 is connected with the storage battery, the resistor R62 is connected with the emitter of the PNP triode Q26 and the cathode of the storage battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321881975.0U CN220830321U (en) | 2023-07-17 | 2023-07-17 | Positive current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321881975.0U CN220830321U (en) | 2023-07-17 | 2023-07-17 | Positive current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220830321U true CN220830321U (en) | 2024-04-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321881975.0U Active CN220830321U (en) | 2023-07-17 | 2023-07-17 | Positive current detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220830321U (en) |
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2023
- 2023-07-17 CN CN202321881975.0U patent/CN220830321U/en active Active
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