CN211786002U - Detection circuit and power supply device - Google Patents
Detection circuit and power supply device Download PDFInfo
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- CN211786002U CN211786002U CN201921614163.3U CN201921614163U CN211786002U CN 211786002 U CN211786002 U CN 211786002U CN 201921614163 U CN201921614163 U CN 201921614163U CN 211786002 U CN211786002 U CN 211786002U
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Abstract
The utility model discloses a detection circuit, including comparing unit, benchmark reference unit, detecting element and first adjustment unit. The comparison unit comprises a first input end, a second input end and an output end. The reference unit is electrically connected with the first input end of the comparison unit and used for generating a reference signal. The detection unit is electrically connected with the second input end of the comparison unit and used for generating a detection signal. One end of the first adjusting unit is electrically connected to the output end of the comparing unit, and the other end of the first adjusting unit is electrically connected to the reference unit or the detecting unit. When the output signal of the output end of the comparison unit jumps instantaneously, the first adjusting unit adjusts the detection signal or the reference signal to increase the signal difference between the detection signal and the reference signal. The utility model discloses still disclose a power supply unit. The utility model discloses can improve the stability of circuit work.
Description
Technical Field
The utility model relates to the technical field of circuits, especially, relate to a detection circuitry and power supply unit.
Background
The power supply device generally includes a battery pack for supplying electric energy, and in order to ensure safe use of the power supply device, it is generally necessary to detect the voltage of the battery pack to prevent the battery pack from being in an undervoltage state or detect the temperature of the battery pack to prevent the battery pack from being over-temperature.
The existing detection circuit usually adopts a comparator to compare a sampling signal with a reference signal, and when the sampling signal is greater than or less than the reference signal, the output signal of the comparator changes to realize the detection of the battery temperature or voltage. However, in the conventional detection circuit, due to the existence of the null shift, when the sampling signal is in a critical state, that is, the sampling signal and the reference signal are relatively close to or the same as each other, the output signal of the comparator is continuously changed (i.e., continuously jumps), which causes the detection circuit to operate unstably, and even damages the electronic device.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model discloses detection circuitry and power supply unit can improve the stability of detection circuitry work, and then improves power supply unit's reliability.
In a first aspect, an embodiment of the present invention discloses a detection circuit, include:
the comparison unit comprises a first input end, a second input end and an output end;
the reference unit is electrically connected with the first input end of the comparison unit and used for generating a reference signal;
the detection unit is electrically connected with the second input end of the comparison unit and is used for generating a detection signal; and
one end of the first adjusting unit is electrically connected to the output end of the comparing unit, and the other end of the first adjusting unit is electrically connected to the reference unit or the detecting unit;
when the output signal of the output end of the comparison unit jumps instantaneously, the first adjustment unit adjusts the detection signal or the reference signal to increase the signal difference between the detection signal and the reference signal.
In a second aspect, an embodiment of the present invention discloses a power supply device, including:
a battery pack including a plurality of battery modules; and
the detection circuit according to the first aspect, the detection circuit is connected to the battery pack and is configured to detect a voltage or a temperature of the battery pack.
The utility model discloses a detection circuitry and power supply unit, owing to included first adjustment unit, work as when the output signal of comparison unit's output jumps in the twinkling of an eye, first adjustment unit is right benchmark reference signal perhaps detection signal adjusts, in order to increase detection signal with signal difference between the benchmark reference signal, and then makes the output signal of comparison unit's output lasts the state after the jump of maintenance after the jump, can not take place to make the condition of continuous jump of output signal because of detection signal and benchmark reference signal are comparatively close to the stability of detection circuitry work has been improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic block diagram of a power supply device according to an embodiment of the present invention.
Fig. 2 is a schematic block diagram of a first embodiment of the detection circuit of fig. 1.
Fig. 3 is a schematic block diagram of a second embodiment of the detection circuit of fig. 1.
Fig. 4 is a schematic block diagram of a third embodiment of the detection circuit of fig. 1.
Fig. 5 is a circuit schematic of the detection circuit of fig. 2.
Fig. 6 is a circuit schematic of the detection circuit of fig. 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The application provides a power supply device and a detection circuit applied to the same. The detection circuit is used for detecting the voltage or the temperature of the battery pack in the power supply device so as to prevent potential safety hazards caused by overhigh temperature or overlow voltage of the battery. The detection circuit in the embodiment of the application can improve the stability of the detection circuit in the working process. Embodiments of the present application will be described below with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of the present invention provides a power supply device 300. The power supply device 300 includes a battery pack 200 and a detection circuit 100. The detection circuit 100 is connected to the battery pack 200 to detect a state parameter of the battery pack 200. Wherein the state parameter comprises at least one of current, voltage, or temperature. In the embodiment of the present application, the power supply device 300 is an emergency starting power supply. In other embodiments, the power supply device 300 may also be other types of power supplies (e.g., a power supply for a power tool), and is not limited herein.
In an embodiment, the battery pack 200 may include one or more connected battery modules (not shown), wherein each battery module may include at least one battery cell (single battery), for example, the battery cell may be a light-weight, energy-saving and environment-friendly lithium ion battery cell. In a specific embodiment, the plurality of battery modules may increase the output voltage and current of the battery pack 200 in a combination of series and parallel connections.
It is understood that the number of battery modules included in the battery pack 200 is different according to different specific designs, for example, if the voltage output by the battery pack 200 is required to be higher, a larger number of battery modules may be connected in series, and if the voltage output by the battery pack 200 is required to be lower, a smaller number of battery modules may be connected in series, and the specific number of battery modules is not limited herein.
Referring to fig. 2, in a first embodiment, the detection circuit 100 includes a comparison unit 10, a reference unit 20, a detection unit 30, and a first adjustment unit 40. Wherein the comparing unit 10 comprises a first input terminal, a second input terminal and an output terminal.
The reference unit 20 is electrically connected to a first input of the comparison unit 10 for generating a reference signal.
The detection unit 30 is electrically connected to a second input terminal of the comparison unit 10, and is configured to generate a detection signal.
One end of the first adjusting unit 40 is electrically connected to the output end of the comparing unit 10, and the other end is electrically connected to the detecting unit 30. When the output signal of the output terminal of the comparing unit 10 jumps instantaneously, the first adjusting unit 40 adjusts the detection signal to increase the signal difference between the detection signal and the reference signal.
The instant jump of the output signal at the output terminal of the comparing unit 10 refers to an instant when the output signal at the output terminal of the comparing unit 10 changes from a high level to a low level, or an instant when the output signal at the output terminal of the comparing unit 10 changes from a low level to a high level.
Referring to fig. 3, in the second embodiment, unlike the detection circuit 100 of the first embodiment (fig. 2), one end of the first adjusting unit 40 is electrically connected to the output end of the comparing unit 10, and the other end is electrically connected to the reference unit 20. When the output signal of the output terminal of the comparing unit 10 jumps instantaneously, the first adjusting unit adjusts the reference signal to increase the signal difference between the detection signal and the reference signal.
In summary, with reference to the first and second embodiments, one end of the first adjusting unit 40 is electrically connected to the output end of the comparing unit 10, and the other end is electrically connected to the reference unit 20 or the detecting unit 30. When the output signal of the output terminal of the comparing unit 10 jumps instantaneously, the first adjusting unit 40 adjusts the reference signal or the detection signal to increase the signal difference between the detection signal and the reference signal.
The detection circuit 100 disclosed in the embodiment of the present application, because the first adjusting unit 40 is included, when the output signal of the output end of the comparing unit 10 jumps instantaneously, the first adjusting unit 40 adjusts the reference signal or the detection signal to increase the signal difference between the detection signal and the reference signal, so that the output signal of the output end of the comparing unit 10 continuously maintains the state after jumping, and the situation that the output signal continuously jumps due to the fact that the detection signal and the reference signal are relatively close to each other does not occur, thereby improving the stability of the operation of the detection circuit.
The embodiment of the utility model provides a power supply unit 300, owing to adopted foretell detection circuitry 100, can improve the stability of circuit in the testing process, and then improved power supply unit 300's performance and quality.
Referring to fig. 4, in a third embodiment, different from the second embodiment (fig. 3), the detection circuit 100 further includes a control unit 50 and a second adjusting unit 60. The second adjusting unit 60 is electrically connected between the control unit 50 and the reference unit 20. The second adjusting unit 60 is configured to adjust the reference signal to increase a signal difference between the detection signal and the reference signal.
The control unit 50 is further electrically connected to the detection unit 30 to collect the detection signal, and controls the second adjustment unit 60 to adjust the reference signal according to the collected detection signal. Therefore, the double regulation of the reference signal can be realized, and the stability and the reliability of the circuit are improved.
In this embodiment, the control unit 50 may be a single chip microcomputer. The control unit 50 may include a plurality of signal acquisition ports, a communication port, a plurality of control ports, and the like.
In one embodiment, the second adjusting unit 60 adjusts the reference unit 20 with a higher priority than the first adjusting unit 40. For example, the second adjusting unit 60 may be a software adjusting unit, and the first adjusting unit 40 may be a hardware adjusting unit. When the detection signal acquired by the control unit 50 is greater than a first preset threshold, the second adjusting unit 60 is controlled to operate to adjust the reference signal. When the control unit 50 or the second adjusting unit 60 fails, the detection signal will continuously rise, and when the detection signal is greater than the reference signal, the output signal of the output terminal of the comparing unit 10 will jump, and at this time, the first adjusting unit 40 operates to adjust the reference signal, so as to increase the signal difference between the detection signal and the reference signal, so that the output signal of the comparing unit 10 is in a stable state, and further, the stability of the circuit operation is improved. The reference signal is greater than a first preset threshold.
Referring to fig. 5, in an embodiment, the comparing unit 10 includes a comparator U, the first input terminal is an inverting input terminal of the comparator U, the second input terminal is a non-inverting input terminal of the comparator U, and the output terminal is an output terminal of the comparator U.
The reference cell 20 includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2. The first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 are connected in series between a power supply VCC and ground. The inverting input terminal of the comparator U is connected to a connection node N1 between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2. In the present embodiment, the power source VCC is provided by the battery pack 100 and is obtained by voltage stabilization.
The sensing unit 30 includes a third voltage dividing resistor R3 and a fourth voltage dividing resistor R4. The third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 are connected in series between the detection object VBAT and the ground. The non-inverting input terminal of the comparator U is connected to a connection node N2 between the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4. In this embodiment, the VBAT to be detected is a battery module, and may be a positive electrode of the battery module.
The first adjusting unit 40 includes a resistor R5, a first electronic switch Q1, and a second electronic switch Q2. The control end of the first electronic switch Q1 is connected with the output end of the comparator U, the first connection end of the first electronic switch Q1 is connected with a power supply VCC, the second connection end of the first electronic switch Q1 is connected with the control end of the second electronic switch Q2, the first connection end of the second electronic switch Q2 is grounded, and the second connection end of the second electronic switch Q2 is connected with the non-inverting input end of the comparator U through the resistor R5.
In a specific embodiment, the control terminal, the first connection terminal and the second connection terminal of the first electronic switch Q1 correspond to the base, the emitter and the collector of the PNP triode, respectively. The control end, the first connection end and the second connection end of the second electronic switch Q2 correspond to a gate, a source and a drain of an N-type MOS (Metal Oxide Semiconductor) field effect transistor, respectively. In this embodiment, the N-type mosfet is a mosfet with a parasitic diode.
In one embodiment, the first adjusting unit 40 further includes a first bias resistor R6, a second bias resistor R7, a third bias resistor R8 and a fourth bias resistor R9. A first terminal of the first bias resistor R6 is connected to the first connection terminal of the first electronic switch Q1, and a second terminal of the first bias resistor R6 is connected to the control terminal of the first electronic switch Q1. The control terminal of the first electronic switch Q1 is connected with the output terminal of the comparator U through the second bias resistor R7. A first terminal of the third bias resistor R8 is connected to the first terminal of the second electronic switch Q2, and a second terminal of the third bias resistor R8 is connected to the control terminal of the second electronic switch Q2. The control terminal of the second electronic switch Q2 is connected to the second connection terminal of the first electronic switch Q1 through the fourth bias resistor R9.
In the embodiment of the present application, the detection circuit 100 is used for detecting the voltage of the battery module to perform under-voltage protection on the battery pack 100. The operation of the detection circuit 100 in the embodiment of the present application will be described below.
In the embodiment of the present application, the example in which the voltage (reference signal) at the connection node N1 is set to 2.5V will be described. When the voltage (detection signal) at the connection node N2 is greater than the voltage at the connection node N1, the input voltage at the non-inverting input terminal of the comparator U is greater than the input voltage at the inverting input terminal, and the output terminal of the comparator U outputs a high level signal, so that the first electronic switch Q1 is in an off state, and the second electronic switch Q2 is in an off state, that is, the first adjusting unit 40 does not operate. At the moment when the voltage at the connection node N2 is lower than the voltage at the connection node N1, the output end of the comparator U outputs a low level signal, so that the first electronic switch Q1 is in a conducting state, the second electronic switch Q2 is in a conducting state, the resistor R5 is connected in parallel with the fourth voltage-dividing resistor R4, the voltage at the connection node N2 is pulled lower, that is, the signal difference between the detection signal and the reference signal is increased, so that the output end continuously outputs the low level signal, and the condition of jumping cannot occur.
It should be noted that when the output signal of the comparator U changes to a low level signal, the back-end control unit may control the battery pack 100 to stop discharging according to the signal, so as to protect the battery pack 100.
Referring to fig. 6, in another embodiment, the comparing unit 10, the reference unit 20, and the detecting unit 30 have the same structure as the detecting circuit 100 in fig. 5, except that the detecting unit 30 in the embodiment of the present application is used for detecting the Temperature of the battery pack 200, the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 are connected in series between a power source VCC and the ground, and the third voltage dividing resistor R3 is a Negative Temperature Coefficient (NTC) thermistor.
Further, the structure and the connection relationship of the first adjusting unit 40' in the present embodiment are also different from the first adjusting unit 40 in fig. 5. In the embodiment of the present application, the first adjusting unit 40' includes a first electronic switch Q3 and a resistor R10. The control end of the first electronic switch Q3 is connected to the output end of the comparator U, the first connection end of the first electronic switch Q3 is grounded, and the second connection end of the first electronic switch Q3 is connected to the connection node N1 through the resistor R10.
In one embodiment, the control terminal, the first connection terminal and the second connection terminal of the first electronic switch Q3 correspond to the gate, the source and the drain of the N-type MOS fet, respectively. In this embodiment, the N-type MOS fet is further provided with a parasitic diode.
In a specific embodiment, the first adjusting unit 40 further includes a first bias resistor R11. The control terminal of the first electronic switch Q3 is connected to the output terminal of the comparator U through the first bias resistor R11.
The second regulating unit 60 comprises a second electronic switch Q4. A control terminal of the second electronic switch Q4 is connected to the control unit 50, a first connection terminal of the second electronic switch Q4 is grounded, and a second connection terminal of the second electronic switch Q4 is connected to the connection node N1.
Further, the second adjusting unit 60 further includes a diode D and a second bias resistor R12. The diode D is connected in series between the control unit 50 and the control terminal of the second electronic switch Q4. Specifically, the control terminal of the second electronic switch Q4 is connected to the anode of the diode D, and the cathode of the diode D is connected to the control unit 50. The control terminal of the second electronic switch Q4 is connected to the power source VCC through the second bias resistor R12.
In one embodiment, the control terminal, the first connection terminal and the second connection terminal of the second electronic switch Q4 correspond to the gate, the source and the drain of the N-type MOS fet, respectively. Wherein, the N-type MOS field effect transistor is also provided with a parasitic diode.
The operation of the detection circuit 100 shown in fig. 6 will be described below.
In the embodiment of the present application, the description will be made taking an example in which the voltage (reference signal) at the connection node N1 is set to 3.33V. When the control unit 50 acquires that the voltage at the connection node N2 is less than a preset voltage (where the preset voltage is less than a reference voltage, such as 3V), the control unit 50 outputs a low level signal to turn on the diode D, the second electronic switch Q4 is in an off state at this time, the output end of the comparator U outputs a low level signal, and further the first electronic switch Q3 is also in an off state, at this time, the first adjusting unit 40' and the second adjusting unit 60 do not work, that is, the voltage at the connection node N1 is not affected. When the temperature of the surface of the battery pack 200 continues to rise, the resistance of the third voltage dividing resistor R3 decreases, which results in the voltage at the connection node N2 rising, and when the voltage at the connection node N2 rises to be greater than the preset voltage, the control unit 50 outputs a high level signal to turn off the diode D, at this time, the second electronic switch Q4 is turned on, and further pulls the voltage at the connection node N1 to the ground (0V), at this time, the output terminal of the comparator U outputs a high level signal. As the reference signal is pulled by 0V, the signal difference between the detection signal and the reference signal is increased, so that the comparator U continuously outputs a high-level signal without jumping.
When the control unit 50 fails or the second adjusting unit 60 fails, the temperature of the battery pack 200 will continuously rise, and the voltage at the connection node N2 will further continue to rise, and when the voltage at the connection node N2 rises to be greater than 3.33V, the output end of the comparator U outputs a high level signal, so that the first electronic switch Q3 is turned on, and the resistor R10 is connected in parallel with the second voltage-dividing resistor R2, so that the voltage at the connection node N1 is reduced (the reference signal is reduced), and the voltage difference between the detection signal and the reference signal is increased, and thus the comparator U continuously outputs a high level signal without generating a jump situation.
It should be understood that the application of the detection circuit 100 to the power supply device 300 is only an example, and the detection circuit 100 may also be applied to other electronic devices requiring detection of temperature or battery voltage.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (10)
1. A detection circuit, comprising:
the comparison unit comprises a first input end, a second input end and an output end;
the reference unit is electrically connected with the first input end of the comparison unit and used for generating a reference signal;
the detection unit is electrically connected with the second input end of the comparison unit and is used for generating a detection signal; and
one end of the first adjusting unit is electrically connected to the output end of the comparing unit, and the other end of the first adjusting unit is electrically connected to the reference unit or the detecting unit;
when the output signal of the output end of the comparison unit jumps instantaneously, the first adjustment unit adjusts the detection signal or the reference signal to increase the signal difference between the detection signal and the reference signal.
2. The detection circuit of claim 1, wherein the first adjustment unit is electrically connected to the detection unit; when the output signal of the output end of the comparison unit jumps instantaneously, the adjustment unit adjusts the detection signal to increase the signal difference between the detection signal and the reference signal.
3. The detection circuit of claim 1, wherein the first adjustment unit is electrically connected to the reference unit; when the output signal of the output end of the comparison unit jumps instantaneously, the first adjusting unit adjusts the reference signal to increase the signal difference between the detection signal and the reference signal.
4. The detection circuit of claim 3, wherein the detection circuit further comprises a control unit and a second adjustment unit; the second adjusting unit is connected between the control unit and the reference unit and used for adjusting the reference signal so as to increase a signal difference value between the detection signal and the reference signal; the control unit is also electrically connected with the detection unit to collect the detection signal and control the second adjustment unit to adjust the reference signal according to the collected detection signal.
5. The detection circuit as recited in claim 4, wherein the second adjustment unit adjusts the reference unit with a higher priority than the first adjustment unit.
6. The detection circuit of claim 2, wherein the first adjustment unit comprises a resistor, a first electronic switch, and a second electronic switch; the control end of the first electronic switch is connected with the output end of the comparison unit, the first connection end of the first electronic switch is connected with a power supply, the second connection end of the first electronic switch is connected with the control end of the second electronic switch, the first connection end of the second electronic switch is grounded, and the second connection end of the second electronic switch is connected with the second input end through the resistor.
7. The detection circuit of claim 3, wherein the first adjustment unit comprises a first electronic switch and a resistor; the control end of the first electronic switch is connected with the output end of the comparison unit, the first connection end of the first electronic switch is grounded, and the second connection end of the first electronic switch is connected with the reference unit through the resistor.
8. The detection circuit of claim 4, wherein the second adjustment unit comprises a second electronic switch; the control end of the second electronic switch is connected with the control unit, the first connecting end of the second electronic switch is grounded, and the second connecting end of the second electronic switch is connected with the reference unit.
9. The detection circuit according to any one of claims 1 to 8, wherein the comparison unit comprises a comparator; the first input end is an inverting input end of the comparator, and the second input end is a non-inverting input end of the comparator.
10. A power supply device, comprising:
a battery pack including one or more battery modules; and
a detection circuit according to any one of claims 1 to 9, connected to the battery pack for detecting a state parameter of the battery pack.
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| CN201921614163.3U CN211786002U (en) | 2019-09-25 | 2019-09-25 | Detection circuit and power supply device |
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| CN201921614163.3U CN211786002U (en) | 2019-09-25 | 2019-09-25 | Detection circuit and power supply device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110646744A (en) * | 2019-09-25 | 2020-01-03 | 深圳市华思旭科技有限公司 | Detection circuit and power supply device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110646744A (en) * | 2019-09-25 | 2020-01-03 | 深圳市华思旭科技有限公司 | Detection circuit and power supply device |
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