CN215010044U - Current-limiting signal generating circuit and electronic equipment - Google Patents
Current-limiting signal generating circuit and electronic equipment Download PDFInfo
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- CN215010044U CN215010044U CN202120365806.6U CN202120365806U CN215010044U CN 215010044 U CN215010044 U CN 215010044U CN 202120365806 U CN202120365806 U CN 202120365806U CN 215010044 U CN215010044 U CN 215010044U
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Abstract
The embodiment of the utility model discloses current-limiting signal generating circuit and electronic equipment, current-limiting signal generating circuit includes sampling module, benchmark module, voltage division module and switch module, and sampling module is connected in first tie point with the input power respectively to and with the electric load connection in the second tie point, and sampling module is used for the current output sampling voltage based on between input power and the electric load; the reference module is connected with the second connection point and used for generating reference voltage based on the input power supply; the voltage division module is respectively connected with the second connection point and the reference module and is used for dividing the reference voltage; the switch module is respectively connected with the first connecting point, the voltage division module and the control unit, and the switch module is used for switching the switch state based on the divided voltage of the sampling voltage and the reference voltage so as to control the connection state between the input power supply and the control unit. By the mode, the current-limiting signal can be generated through the circuit structure, and the cost is low.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a current-limiting signal generating circuit and electronic equipment.
Background
In the field of circuit design, corresponding circuits need to be designed and relevant measures need to be taken to solve the problems of power supply quality and reliability, overlarge input voltage ripple, current impact at the moment of load starting, overload and short circuit in the normal working process and the like.
At present, in order to solve the problem that the load is damaged due to overlarge current, a corresponding current limiting circuit needs to be arranged.
The existing current limiting circuit generally needs to use a dedicated current limiting chip to output a current limiting signal so as to implement a current limiting function, however, this solution needs to use a dedicated current limiting chip, which results in higher cost.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a aim at providing a current-limiting signal generating circuit and electronic equipment, the utility model discloses can produce the current-limiting signal through circuit structure, the cost is lower.
In order to achieve the above object, in a first aspect, the present invention provides a current-limiting signal generating circuit, the current-limiting signal generating circuit is configured to be connected to an input power source, a control unit, and an electrical load, respectively, and the current-limiting signal generating circuit includes:
the sampling module is respectively connected with the input power supply to a first connection point and connected with the electric load to a second connection point, and is used for outputting sampling voltage based on the current between the input power supply and the electric load;
a reference module connected to the second connection point, the reference module configured to generate a reference voltage based on the input power;
the voltage division module is respectively connected with the second connection point and the reference module and is used for dividing the reference voltage;
the switch module is respectively connected with the first connecting point, the voltage division module and the control unit, and the switch module is used for switching the switch state based on the divided voltage of the sampling voltage and the reference voltage so as to control the input power supply and the connection state between the control units.
In an alternative mode, the reference module comprises a diode and a first resistor;
the anode of the diode is connected with the second connection point, the cathode of the diode is connected with one end of the first resistor, and the other end of the first resistor is grounded.
In an alternative mode, the voltage division module comprises a second resistor and a third resistor which are connected in series;
the non-series end of the second resistor is connected with the second connection point, the connection point between the second resistor and the third resistor is connected with the switch unit, and the non-series end of the third resistor is connected with the reference module.
In an alternative form, the sampling module includes a fourth resistor;
and two ends of the fourth resistor are respectively connected with the input power supply and the first connecting point, and the electric load is connected with the second connecting point.
In an optional mode, the switch module comprises a switch tube and a fifth resistor;
the control end of the switch tube is connected with the voltage division module, the first end of the switch tube is connected with the first connecting point, and the second end of the switch tube is grounded through the fifth resistor.
In an optional mode, the switch tube is a triode, a base of the triode is a control end of the switch tube, an emitter of the triode is a first end of the switch tube, and a collector of the triode is a second end of the switch tube.
In an optional mode, the current-limiting signal generating circuit further comprises a sixth resistor;
one end of the sixth resistor is connected with the switch module, and the other end of the sixth resistor is connected with the control unit.
In a second aspect, the present invention provides an electronic device, comprising a control unit, an electric load, and the current-limiting signal generating circuit;
the current-limiting signal generating circuit is respectively connected with the control unit, the electric load and the input power supply, and is used for outputting a current-limiting signal to the control unit based on the current between the output power supply and the electric load.
The embodiment of the utility model provides a beneficial effect is: the utility model provides a current-limiting signal generating circuit is used for being connected with input power respectively, the control unit and power consumption load, current-limiting signal generating circuit includes reference module, partial pressure module, sampling module and switch module, wherein, sampling module is connected with input power respectively to the first connecting point, and with power consumption load connection to the second connecting point, reference module is connected with the second connecting point, partial pressure module is connected with second connecting point and reference module respectively, switch module is connected with first connecting point, partial pressure module and the control unit respectively, therefore, when the electric current is less than the current-limiting value, the partial pressure of the sampling voltage on the sampling module and the reference voltage that reference module produced makes the on-off state of switch module switch to the off-state, be the off-state between input power and the control unit at this moment, the control unit has not received the current-limiting signal, when the current is larger than the current limiting value, the sampling voltage on the sampling module is increased, so that the sampling voltage on the sampling module and the reference voltage generated by the reference module are divided to enable the switching state of the switching module to be switched into a communicating state, at the moment, the input power supply and the control unit are in a connecting state, the control unit receives a high level signal, the high level signal is a current limiting signal, the process generates the current limiting signal to the control unit through a circuit structure, and the cost is low.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electronic device according to another embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a current-limiting signal generating circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device. As shown in fig. 1, the electronic device includes a current limit signal generating circuit 100, a control unit 200, and an electric load 300. The current-limiting signal generating circuit 100 is connected to the control unit 200, the electrical load 300, and the input power source 400. The current-limiting signal generating circuit 100 can output a current-limiting signal according to a current between the input power supply 400 and the electrical load 300, that is, when the current between the electrical load 300 and the input power supply 400 exceeds a current-limiting value, the current-limiting signal generating circuit 100 can output a corresponding current-limiting signal to the control unit 200 according to the current, so that the control unit 200 can take corresponding measures in time to reduce the current value, thereby protecting components in the current or protecting the electrical load 300 from being damaged due to an excessive current.
It is understood that, in the embodiments of the present invention, the electronic apparatus refers to an electronic apparatus having a control unit. Electronic devices include, but are not limited to: smart phones (such as Android phones and iOS phones that carry other operating systems), tablet computers, palm computers, and notebook computers.
Specific types of electronic devices are listed above, but those skilled in the art will appreciate that embodiments of the present invention are not limited to the listed types, but may be applied to any other types of electronic devices.
The electric load 300 refers to a load that can consume electric power, for example, a lithium battery. When the electrical load 300 is a lithium battery, the current-limiting signal generating circuit 100 may be configured to constantly monitor the charging current during the charging process of the input power 400 for the lithium battery, and output the current-limiting signal to the control unit 200 if the charging current exceeds the current-limiting value, so that the control unit 200 can take corresponding measures in time, for example, immediately stop the charging process or reduce the voltage of the input power, so as to protect the lithium battery.
As shown in fig. 2, the current-limiting signal generating circuit 100 includes a sampling module 10, a reference module 20, a voltage dividing module 30, and a switching module 40. The sampling module 10 and the input power supply 400 are connected to a first connection point P1, and the sampling module 10 and the electric load 300 are connected to a second connection point P2; the reference module 20 is connected to the second connection point P2; the voltage dividing module 30 is connected to the second connection point P2 and the reference module 20; the switch module 40 is connected to the first connection point P1, the voltage divider module 30, and the control unit 200. It can be seen that the sampling module 10, the switching module 40 and the input power supply 400 are all connected to the first connection point P1; the sampling module 10, the reference module 20, the voltage dividing module 30 and the electric load 300 are all connected to the second connection point P2.
Specifically, when the current between the input power 400 and the electrical load 300 does not reach the current limiting value, the input power 400 passes through the sampling module 10 and then is input to the reference module 20, so that the reference module 20 has a reference voltage, that is, the reference module generates a reference voltage based on the input power. Then, the voltage dividing module 30 divides the reference voltage and inputs the divided voltage of the reference voltage to the switching module 40. Meanwhile, the sampling module 10 can output a sampled voltage according to a current between the input power 400 and the electric load 300. The divided voltage of the reference voltage and the sampling voltage output by the sampling module 10 are both related to the switching state of the switching module 40. In the present case, the divided reference voltage and the sampling voltage output by the sampling module 10 can make the switch state of the switch module 40 in the off state, so that the state between the input power 400 and the control unit 200 is also in the off state, the control unit 200 can determine that the current at this time does not reach the current limiting value, which can be regarded as a low level signal received by the control unit 200.
When the current between the input power source 400 and the electrical load 300 reaches the current limiting value, the sampling voltage output by the sampling module 10 is correspondingly increased, and the combination of the increased sampling voltage and the divided voltage of the reference voltage can switch the switching state of the switching module 40 to the connection state. Then, the input power 400 is connected to the control unit 200 through the switch module 40, and the input power 400 is input to the control unit 200 as a high level signal through the switch module 40, where the high level signal is a current limiting signal. When the control unit 200 receives the current limit signal, it may be determined that the current between the input power source 400 and the electrical load 300 has reached the current limit value, which requires a corresponding processing scheme to solve the problem of excessive current.
Wherein, in an embodiment, the sampling module 10 includes a fourth resistor. The circuit configuration of the current limit signal generating circuit shown in fig. 3 will be described as an example. As shown in fig. 3, the fourth resistor corresponds to the fourth resistor R4.
In one embodiment, the reference module 20 includes a diode and a first resistor. The circuit structure of the current limit signal generating circuit shown in fig. 3 is still used as an example for explanation. As shown in fig. 3, the diode corresponds to the diode D1, and the first resistor corresponds to the first resistor R1.
In one embodiment, the voltage divider module 30 includes a second resistor and a third resistor. The circuit structure of the current limit signal generating circuit shown in fig. 3 is still used as an example for explanation. As shown in fig. 3, the second resistor corresponds to the second resistor R2, and the third resistor corresponds to the third resistor R3.
In one embodiment, the switch module 40 includes a switch tube and a fifth resistor. The circuit structure of the current limit signal generating circuit shown in fig. 3 is still used as an example for explanation. As shown in fig. 3, the switch corresponds to the transistor Q1, and the fifth resistor corresponds to the fifth resistor R5.
In another embodiment, the current-limiting signal generating circuit further includes a sixth resistor, and the sixth resistor can perform a current-limiting function to prevent the control unit 200 from being damaged when the input power VCC is large. The circuit configuration of the current limit signal generating circuit shown in fig. 3 will be described as an example. As shown in fig. 3, the sixth resistance corresponds to the sixth resistance R6.
It should be noted that the switching tube in the switching module 40 may be one of a triode, an MOS tube, or an IGBT switching tube.
If the switch tube is a triode, the base electrode of the triode is the control end of the switch tube, the emitter electrode of the triode is the first end of the switch tube, and the collector electrode of the triode is the second end of the switch tube.
If the switch tube is an MOS tube or an IGBT switch tube, the grid electrode of the MOS tube or the IGBT switch tube is the control end of the switch tube, the source electrode of the MOS tube or the IGBT switch tube is the first end of the switch tube, and the drain electrode of the MOS tube or the IGBT switch tube is the second end of the switch tube.
Specifically, an input power VCC (corresponding to the input power 400 in the above embodiment) is connected to the first connection point P1 with an emitter of the transistor Q1 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to one end of the second resistor R2, an anode of the diode D1, and the connection point S2, respectively, and is connected to the second connection point P2, a base of the transistor Q1 is connected to the other end of the second resistor R2 and one end of the third resistor R3, the other end of the third resistor R3 is connected to a cathode of the diode D1 and one end of the first resistor R1, the other end of the first resistor R1 is grounded, a collector of the transistor Q1 is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the connection point S1, and the other end of the fifth resistor R5 is grounded. The connection point S2 is used for connecting to the electrical load 300, and the connection point S1 is used for connecting to the control unit 200.
In practical applications, assuming that the current between the input power VCC and the electric load 300 is I1, the voltage VR4 across the fourth resistor R4 is VR4 ═ I1 × R4. The first resistor R1 is mainly used to make the diode D1 have current flowing through it, and at this time, the voltage drop of the diode D1 is a constant value, usually 0.7v, and the reference voltage is 0.7 v. Then, the voltage division VR2 of the reference voltage on the second resistor R2 is: VR2 ═ r2/(r2+ r3) × 0.7. Then, the voltage difference Veb between the emitter and the base of the transistor Q1 is: Veb-VR 4+ VR 2-I1 r4+ r2/(r2+ r3) 0.7. R2, R3 and R4 are resistance values corresponding to the second resistor R2, the third resistor R3 and the fourth resistor R4, respectively.
It can be seen that the voltage difference Veb between the emitter and the base of the transistor Q1 depends on the current I1 between the input power VCC and the electrical load 300 and the resistance values of the second resistor R2, the third resistor R3, and the fourth resistor R4.
It should be appreciated that the current limit value may be determined based on the conduction condition of transistor Q1. For example, assume that the conduction condition of transistor Q1 is: veb > 0.7V. Substituting Veb 0.7V into the above equation yields: 0.7 ═ I1 r4+ r2/(r2+ r3) 0.7, calculated as: i1 ═ 0.7 ═ 1-r2/(r2+ r3))/r 4. The calculated I1 is the current limiting value. At this time, the current limit value depends on the resistance values of the second resistor R2, the third resistor R3, and the fourth resistor R4, and by adjusting the resistance values of the second resistor R2, the third resistor R3, and the fourth resistor R4, the current limit value, that is, the threshold value of the current between the input power source VCC and the electric load 300 can be adjusted.
Meanwhile, in order to avoid heat generation of the fourth resistor R4 due to excessive power, the fourth resistor R4 may be a resistor with a small resistance value. Then, the current-limiting value is adjusted by mainly adjusting the voltage-dividing ratio between the second resistor R2 and the third resistor R3, i.e., by adjusting the ratio of the resistance values between the second resistor R2 and the third resistor R3, the current-limiting value can be adjusted.
In summary, when the current between the input power VCC and the electrical load 300 does not reach the current limiting value, the voltage between the emitter and the collector of the transistor Q1 does not reach the conducting condition of the transistor Q1. At this time, the transistor Q1 cannot be turned on, the signal output from the connection point S1 is a low level signal, and the control unit 200 determines that the current between the input power VCC and the electric load 300 does not reach the current limit value at this time according to the low level signal received from the connection point S1, without any measures.
When the current between the input power VCC and the electrical load 300 reaches a current limit value, then the voltage between the emitter and collector of transistor Q1 reaches the conduction condition of transistor Q1. At this time, the input power VCC is connected to the connection point S1 through the emitter and collector of the transistor Q1 and the sixth resistor R6, and the signal output from the connection point S1 is a high level signal. The control unit determines, based on the high signal received from the connection point S1, that the current between the input power source and the electrical load 300 has reached the current limiting value, which requires a corresponding solution.
Through the process, the current-limiting signal is generated by adopting a pure hardware circuit, and the cost is lower. In addition, the current limiting value can be adjusted by adjusting the resistance values of the second resistor R2 and the third resistor R3 in the circuit, so that the circuit is suitable for various different load requirements, and has strong adaptability.
The utility model provides a current-limiting signal generating circuit 100 is used for being connected with the control unit 200 respectively, power consumption load 300, and input power 400, current-limiting signal generating circuit 100 includes sampling module 10, reference module 20, partial pressure module 30 and switch module 40, wherein, sampling module 10 is connected with input power 400 respectively in first connecting point P1, and with power consumption load 300 connection in second connecting point P2, reference module 20 is connected with second connecting point P2, partial pressure module 30 is connected with second connecting point P2 and reference module 20 respectively, switch module 40 is connected with first connecting point P1 respectively, partial pressure module 30 and control unit 200, therefore, when the electric current is less than the current-limiting value, the partial pressure of the sampling voltage on sampling module 10 and the reference voltage that reference module 20 produced makes the on-off state switch of switch module 40 switch to the off-state, be the off-state between input power 400 and the control unit 200 at this moment, the control unit 200 does not receive the current limiting signal, and when the current is greater than the current limiting value, the sampling voltage on the sampling module 10 is increased, so that the voltage division between the sampling voltage on the sampling module 10 and the reference voltage generated by the reference module 20 can switch the switching state of the switching module 40 to the connection state, at this time, the input power supply 400 is in the connection state with the control unit 200, the control unit 200 receives a high level signal, the high level signal is the current limiting signal, the above process is to generate the current limiting signal to the control unit 200 through the circuit structure, and the cost is low.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. A current-limiting signal generating circuit, wherein the current-limiting signal generating circuit is configured to be connected to an input power source, a control unit, and an electrical load, respectively, and wherein the current-limiting signal generating circuit comprises:
the sampling module is respectively connected with the input power supply to a first connection point and connected with the electric load to a second connection point, and is used for outputting sampling voltage based on the current between the input power supply and the electric load;
a reference module connected to the second connection point, the reference module configured to generate a reference voltage based on the input power;
the voltage division module is respectively connected with the second connection point and the reference module and is used for dividing the reference voltage;
the switch module is respectively connected with the first connecting point, the voltage division module and the control unit, and the switch module is used for switching the switch state based on the divided voltage of the sampling voltage and the reference voltage so as to control the input power supply and the connection state between the control units.
2. The current-limited signal generating circuit of claim 1,
the reference module comprises a diode and a first resistor;
the anode of the diode is connected with the second connection point, the cathode of the diode is connected with one end of the first resistor, and the other end of the first resistor is grounded.
3. The current-limited signal generating circuit of claim 1,
the voltage division module comprises a second resistor and a third resistor which are connected in series;
the non-series end of the second resistor is connected with the second connection point, the connection point between the second resistor and the third resistor is connected with the switch module, and the non-series end of the third resistor is connected with the reference module.
4. The current-limited signal generating circuit of claim 1,
the sampling module comprises a fourth resistor;
and two ends of the fourth resistor are respectively connected with the input power supply and the first connecting point, and the electric load is connected with the second connecting point.
5. The current-limited signal generating circuit of claim 1,
the switch module comprises a switch tube and a fifth resistor;
the control end of the switch tube is connected with the voltage division module, the first end of the switch tube is connected with the first connecting point, and the second end of the switch tube is grounded through the fifth resistor.
6. The current-limited signal generating circuit of claim 5,
the switch tube is a triode, the base electrode of the triode is the control end of the switch tube, the emitter electrode of the triode is the first end of the switch tube, and the collector electrode of the triode is the second end of the switch tube.
7. The current-limited signal generating circuit of claim 1,
the current-limiting signal generating circuit further comprises a sixth resistor;
one end of the sixth resistor is connected with the switch module, and the other end of the sixth resistor is connected with the control unit.
8. An electronic device comprising a control unit, an electric load, and the current-limiting signal generating circuit according to any one of claims 1 to 7;
the current-limiting signal generating circuit is respectively connected with the control unit, the electric load and the input power supply, and is used for outputting a current-limiting signal to the control unit based on the current between the input power supply and the electric load.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120365806.6U CN215010044U (en) | 2021-02-07 | 2021-02-07 | Current-limiting signal generating circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120365806.6U CN215010044U (en) | 2021-02-07 | 2021-02-07 | Current-limiting signal generating circuit and electronic equipment |
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| CN215010044U true CN215010044U (en) | 2021-12-03 |
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