CN219348985U

CN219348985U - Reference voltage source, signal detection circuit and electronic equipment

Info

Publication number: CN219348985U
Application number: CN202223133654.0U
Authority: CN
Inventors: 庄朝晖; 单亮
Original assignee: Contemporary Amperex Technology Co Ltd; Contemporary Amperex Intelligence Technology Shanghai Ltd
Current assignee: Contemporary Amperex Technology Co Ltd; Contemporary Amperex Intelligence Technology Shanghai Ltd
Priority date: 2022-11-24
Filing date: 2022-11-24
Publication date: 2023-07-14
Anticipated expiration: 2032-11-24

Abstract

The application discloses reference voltage source, signal detection circuit and electronic equipment, the reference signal source includes reference voltage modulation circuit, reference voltage output port, first isolation resistance, first filter capacitor, output pulse width modulation signal to the first end of first isolation resistance through reference voltage modulation circuit, keep apart reference voltage modulation circuit and reference voltage output port by first isolation resistance, and be connected with the second end of first isolation resistance by the first end of first filter capacitor, the second ground connection of first filter capacitor carries out filter processing to pulse width modulation signal through first filter capacitor, and convert pulse width modulation signal into reference voltage signal output to reference voltage output port, thereby need not to change hardware circuit and can realize the regulation to reference voltage signal, make same reference voltage source can be applicable to different projects and power platform, signal detection circuit's commonality has been improved.

Description

Reference voltage source, signal detection circuit and electronic equipment

Technical Field

The application relates to the field of signal detection, in particular to a reference voltage source, a signal detection circuit and electronic equipment.

Background

With the technological development of rechargeable batteries, rechargeable batteries have been widely used in various fields such as electric tools, portable devices, electric vehicles, and the like. By charging a rechargeable battery and providing it to the powered device. In the charging process and discharging process of the rechargeable battery, the charging current and the discharging current need to be detected so as to avoid the occurrence of overcharge, overdischarge and other conditions, thereby avoiding the occurrence of safety accidents, the damage of the service life of the battery and the like.

In the current overcurrent detection protection circuit, the voltage divider circuit generally sets the overcurrent threshold voltage, and once the overcurrent threshold voltage is set, the hardware circuit needs to be changed to adjust the overcurrent threshold voltage, so that the application scene of the overcurrent detection circuit is greatly limited.

Disclosure of Invention

In view of the above problems, the present application provides a reference voltage source, a signal detection circuit and an electronic device, which can solve the problem that the current overcurrent detection protection circuit must adjust the overcurrent threshold voltage by changing a hardware circuit, so as to greatly limit the application scenario of the overcurrent detection circuit.

A first aspect of embodiments of the present application provides a reference voltage source, the reference voltage source comprising:

A reference voltage modulation circuit for outputting a pulse width modulation signal;

a reference voltage output port;

the first end of the first isolation resistor is connected with the reference voltage modulation circuit, the second end of the first isolation resistor is connected with the reference voltage output port, and the first isolation resistor is used for isolating the reference voltage modulation circuit and the reference voltage output port;

the first end of the first filter capacitor is connected with the second end of the first isolation resistor, the second end of the first filter capacitor is grounded, and the first filter capacitor is used for performing filter processing on the pulse width modulation signal and converting the pulse width modulation signal into a reference voltage signal to be output to the reference voltage output port.

In the technical scheme of the embodiment of the application, the pulse width modulation signal is output to the first end of the first isolation resistor through the reference voltage modulation circuit, the reference voltage modulation circuit and the reference voltage output port are isolated by the first isolation resistor, the first end of the first filter capacitor is connected with the second end of the first isolation resistor, the second end of the first filter capacitor is grounded, the pulse width modulation signal is subjected to filtering processing through the first filter capacitor, the pulse width modulation signal is converted into the reference voltage signal and output to the reference voltage output port, the reference voltage signal can be regulated by regulating the duty ratio of the pulse width modulation signal, so that a hardware circuit is not required to be changed, the same reference voltage source can be suitable for different projects and power platforms, and the universality of the signal detection circuit is improved. In one embodiment, at least one second isolation resistor and at least one second filter capacitor are further arranged between the reference voltage output port and the first isolation resistor;

The second filter capacitor is correspondingly connected with the second isolation resistor, the second isolation resistor is connected with the first isolation resistor in series, and the second filter capacitor is connected with the corresponding second isolation resistor in parallel.

According to the technical scheme, the reference voltage signal can be subjected to secondary filtering processing by adding at least one RC circuit consisting of the second isolation resistor and the second filter capacitor to the reference voltage output port and the first isolation resistor, so that a more stable reference voltage signal is generated.

In one embodiment, the second isolation resistor has a resistance equal to the resistance of the first isolation resistor.

In the technical scheme of the embodiment of the application, the resistance value of the second isolation resistor is equal to that of the first isolation resistor, so that the stability of secondary filtering treatment can be improved, and voltage fluctuation caused by overlarge difference of the resistance values is avoided.

In one embodiment, the capacitance of the second filter capacitor is equal to the capacitance of the first filter capacitor.

In the technical scheme of the embodiment of the application, the capacitance value of the second filter capacitor is equal to that of the first filter capacitor, so that the stability of secondary filter processing can be improved, and voltage fluctuation caused by overlarge capacitance value phase difference is avoided.

In one embodiment, the reference voltage modulation circuit is further configured to receive a reference voltage control signal and generate the pulse width modulation signal according to the reference voltage control signal.

According to the technical scheme, the duty ratio of the pulse width modulation signal can be adjusted by providing the reference voltage control signal to the reference voltage modulation circuit, so that the voltage of the reference voltage signal is adjusted by controlling the duty ratio of the pulse width modulation signal, the universality of the detection circuit is improved, the application range of the detection circuit is increased, the detection precision can be improved by adjusting the duty ratio of the pulse width modulation signal by the reference voltage modulation circuit according to the reference voltage control signal, and false triggering events caused by low detection precision are avoided on the premise that a hardware circuit is not changed.

The second aspect of the embodiments of the present application further provides a signal detection circuit, including:

the first pulse width modulation module is used for outputting a first pulse width modulation signal;

the second pulse width modulation module is used for outputting a second pulse width modulation signal;

the first end of the first resistor module is connected with the first pulse width modulation module;

The non-inverting input end of the first comparison module is connected with the second end of the first resistance module, and the first resistance module is used for isolating the first comparison module from the first pulse width modulation module;

the first capacitor module is connected with the second end of the first resistor module, the second end of the first capacitor module is grounded, and the first capacitor module is used for filtering the first pulse width modulation signal and converting the first pulse width modulation signal into a first threshold voltage signal;

the first end of the second resistor module is connected with the second pulse width modulation module;

the first end of the second capacitor module is connected with the second end of the second resistor module, the second end of the second capacitor module is grounded, and the second capacitor module is used for filtering the second pulse width modulation signal and converting the second pulse width modulation signal into a second threshold voltage signal;

the inverting input end of the second comparison module is connected with the second end of the second resistance module, the non-inverting input end of the second comparison module and the inverting input end of the first comparison module are connected with the detection signal end together, and the second resistance module is used for isolating the second comparison module from the second pulse width modulation module;

The detection signal end is used for accessing a signal to be detected, the first comparison module is used for comparing the signal to be detected with the first threshold voltage signal to generate a first comparison signal, and the second comparison module is used for comparing the signal to be detected with the second threshold voltage signal to generate a second comparison signal.

In the technical scheme of the embodiment of the application, an upper limit reference signal source is formed by the first pulse width modulation module, the first resistor module and the first capacitor module, a first threshold voltage signal is provided for the first comparison module, a lower limit reference signal source is formed by the second pulse width modulation module, the second resistor module and the second capacitor module, a second threshold voltage signal is provided for the second comparison module, a window comparator is formed by the first comparison module and the second comparison module, a signal to be detected, which is connected with a detection signal end, is compared with the first threshold voltage signal and the second threshold voltage signal, a corresponding comparison signal is generated, meanwhile, the duty ratio of the first pulse width modulation signal and the second pulse width modulation signal is adjusted by the first pulse width modulation module and the second pulse width modulation module, the voltage of the first threshold voltage signal and the voltage of the second threshold voltage signal are adjusted according to different design requirements and application scenes, the universality of the detection circuit is improved, and the application range of the detection circuit is increased.

In one embodiment, the first comparison module includes: a first comparator, a first pull-up resistor;

the positive phase signal pin of the first comparator is connected with the second end of the first resistor module, the inverted signal pin of the first comparator is connected with the detection signal end, the output pin of the first comparator and the first end of the first pull-up resistor are connected with the first detection output end in a sharing mode, and the second end of the first pull-up resistor and the power supply pin of the first comparator are connected with a first comparator power supply in a sharing mode.

In one embodiment, the second comparison module comprises: a second comparator, a second pull-up resistor;

the inverting signal pin of the second comparator is connected with the second end of the second resistor module, the positive phase signal pin of the second comparator is connected with the detection signal end, the output pin of the second comparator and the first end of the second pull-up resistor are connected with the second detection output end in a sharing way, and the second end of the second pull-up resistor and the power supply pin of the second comparator are connected with a second comparator power supply in a sharing way.

In the technical scheme of the embodiment of the application, the first comparison module and the second comparison module form a window comparator, the signal to be detected, which is accessed by the detection signal end, is compared with the first threshold voltage signal and the second threshold voltage signal to generate corresponding comparison signals, meanwhile, the duty ratio of the first pulse width modulation signal and the second pulse width modulation signal is adjusted by the first pulse width modulation module and the second pulse width modulation module, the voltage of the first threshold voltage signal and the voltage of the second threshold voltage signal are adjusted according to different design requirements and application scenes, the universality of the detection circuit is improved, and the application range of the detection circuit is increased.

In one embodiment, at least one first isolation module with the same function as the first resistor module and at least one first filtering module with the same function as the first capacitor module are further arranged between the first resistor module and the first comparison module;

the first filter module is correspondingly connected with the first isolation module, the first isolation module is connected with the first resistor module in series, and the first filter module is connected with the corresponding first isolation module in parallel.

According to the technical scheme, the RC circuit formed by the first isolation module and the first filtering module is added between the first resistance module and the first comparison module, so that the second filtering processing of the first threshold voltage signal can be realized, and a more stable first threshold voltage signal is generated.

In one embodiment, the resistance of the first isolation module is equal to the resistance of the first resistor module.

In the technical scheme of the embodiment of the application, the resistance value of the first isolation module is equal to that of the first resistance module, so that the stability of secondary filtering treatment can be improved, and voltage fluctuation caused by overlarge phase difference of the resistance values is avoided.

In one embodiment, the capacitance of the first filter module is equal to the capacitance of the first capacitor module.

In the technical scheme of the embodiment of the application, the capacitance value of the first filtering module is equal to that of the first capacitance module, so that the stability of secondary filtering processing can be improved, and voltage fluctuation caused by overlarge capacitance value phase difference is avoided.

In one embodiment, at least one second isolation module with the same function as the second resistance module and at least one second filtering module with the same function as the second capacitance module are further arranged between the second resistance module and the second comparison module;

the second filter module is correspondingly connected with the second isolation module, the second isolation module is connected with the second resistor module in series, and the second filter module is connected with the corresponding second isolation module in parallel.

In the technical scheme of the embodiment of the application, by adding at least one RC circuit formed by the second filtering module and the second isolation module between the second resistance module and the second comparison module, the second filtering processing on the second threshold voltage signal can be realized, and a more stable second threshold voltage signal is generated.

In one embodiment, the resistance of the second isolation module is equal to the resistance of the second resistor module.

In the technical scheme of the embodiment of the application, the resistance value of the second isolation module is equal to that of the second resistance module, so that the stability of secondary filtering treatment can be improved, and voltage fluctuation caused by overlarge phase difference of the resistance values is avoided.

In one embodiment, the capacitance of the second filter module is equal to the capacitance of the second capacitor module.

In the technical scheme of the embodiment of the application, the capacitance value of the second filtering module is equal to that of the second capacitance module, so that the stability of secondary filtering processing can be improved, and voltage fluctuation caused by overlarge capacitance value phase difference is avoided.

In one embodiment, the signal detection circuit further comprises:

the main control module is connected with the first comparison module and the second comparison module, and is further used for receiving the first comparison signal and the second comparison signal and generating a monitoring signal according to the first comparison signal and the second comparison signal.

According to the technical scheme, the voltage of the first threshold voltage signal and the voltage of the second threshold voltage signal can be controlled by setting the duty ratio of the first pulse width modulation signal and the duty ratio of the second pulse width modulation signal, so that the signal to be detected is respectively connected with the first threshold voltage signal and the second threshold voltage signal under the condition that hardware conditions are not changed, and then the voltage interval of the signal to be detected is judged by the main control module based on the levels of the first comparison signal and the second comparison signal, and the purpose of judging whether the signal to be detected is overvoltage or not under the condition that the hardware conditions are not changed is achieved.

In one embodiment, the main control module is further connected to the first pulse width modulation module and the second pulse width modulation module, and is configured to output a first pulse width control signal to the first pulse width modulation module and output a second pulse width control signal to the second pulse width modulation module;

the first pulse width modulation module generates the first pulse width modulation signal according to the first pulse width control signal, and the second pulse width modulation module generates the second pulse width modulation signal according to the second pulse width control signal.

In the technical scheme of the embodiment of the application, the first pulse width control signal is output to the first pulse width modulation module through the main control module, and the second pulse width control signal is output to the second pulse width modulation module, so that the first pulse width modulation module is controlled to adjust the duty ratio of the first pulse width modulation signal, the second pulse width modulation module is controlled to control the duty ratio of the second pulse width modulation signal, and then the main control module can adjust the duty ratio of the first pulse width modulation signal and the duty ratio of the second pulse width modulation signal according to different design requirements and application scenes so as to adjust the voltages of the first threshold voltage signal and the second threshold voltage signal, thereby not only improving the universality of the detection circuit and increasing the application range of the detection circuit, but also improving the detection precision by adjusting the duty ratio of the first pulse width modulation signal and the second pulse width modulation signal, and avoiding false triggering events caused by low detection precision.

In one embodiment, the master control module is further configured to control the duty cycle of the first pulse width modulation signal output by the first pulse width modulation module and the duty cycle of the second pulse width modulation signal output by the second pulse width modulation module to be complementary, and the duty cycle of the first pulse width modulation signal is greater than the duty cycle of the second pulse width modulation signal.

According to the technical scheme, the duty ratio of the first pulse width modulation signal is larger than that of the second pulse width modulation signal, so that the voltage of the first threshold voltage signal is controlled to be larger than that of the second threshold voltage signal, the first threshold voltage signal is set to be the upper limit threshold voltage of the window comparator, the second threshold voltage signal is set to be the lower limit threshold voltage of the window comparator, and the purpose of comparing the signal to be detected with the threshold voltage range under the condition that hardware conditions are not changed is achieved.

In one embodiment, the master control module is further configured to control a sum of duty ratios of the first pulse width modulation signal output by the first pulse width modulation module and the second pulse width modulation signal output by the second pulse width modulation module to be equal to 1.

A third aspect of the embodiments of the present application further provides an electronic device, including a reference voltage source according to any one of the embodiments above; or the electronic device comprises a signal detection circuit as described in any one of the embodiments above.

In the technical scheme of the embodiment of the application, the reference signal source comprises a reference voltage modulation circuit, a reference voltage output port, a first isolation resistor and a first filter capacitor, pulse width modulation signals are output to the first end of the first isolation resistor through the reference voltage modulation circuit, the reference voltage modulation circuit and the reference voltage output port are isolated by the first isolation resistor, the first end of the first filter capacitor is connected with the second end of the first isolation resistor, the second end of the first filter capacitor is grounded, the pulse width modulation signals are subjected to filter processing through the first filter capacitor, the pulse width modulation signals are converted into reference voltage signals, the reference voltage signals are output to the reference voltage output port, and therefore adjustment of the reference voltage signals can be achieved without changing a hardware circuit, the same reference voltage source can be suitable for different projects and power platforms, and the universality of the signal detection circuit is improved.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

FIG. 1 is a schematic diagram of a first structure of a reference voltage source according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a second structure of a reference voltage source according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of a first structure of a signal detection circuit according to an embodiment of the present application;

fig. 4 is a schematic diagram of a second structure of the signal detection circuit according to the embodiment of the present application;

fig. 5 is a schematic diagram of a third structure of the signal detection circuit according to the embodiment of the present application;

fig. 6 is a schematic diagram of a fourth configuration of a signal detection circuit according to an embodiment of the present application;

fig. 7 is a schematic diagram of a fifth structure of a signal detection circuit according to an embodiment of the present application.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

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 application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "multi-frame" refers to more than two (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In order to control the overcharge or overcurrent discharge of the battery, the charging current and the discharging current need to be detected in the charging process and the discharging process of the rechargeable battery so as to avoid the occurrence of overcharge, overcurrent discharge and other conditions, thereby avoiding the occurrence of safety accidents, the damage of the service life of the battery and the like.

In the related overcurrent detection circuit, the current signal is converted into the corresponding voltage sampling signal by the voltage dividing circuit, and meanwhile, the power supply voltage is divided by the other voltage dividing circuit to form the overcurrent threshold voltage, or the conduction voltage drop of the diode is introduced as the judgment of the overcurrent threshold voltage, however, once the overcurrent threshold voltage is set, the hardware circuit is required to be changed to adjust the overcurrent threshold voltage, so that the application scene of the overcurrent detection circuit is greatly limited.

In order to solve the problem that the overcurrent threshold voltage must be adjusted by changing the hardware circuit in the overcurrent detection protection circuit, the embodiment of the application provides a reference voltage source, the reference voltage source is suitable for the situation that overvoltage judgment or comparison needs to be carried out on the voltage of a signal, the reference voltage source can be connected to the positive input end or the negative input end of the comparison circuit to serve as the threshold voltage, the comparison circuit carries out voltage comparison on the signal to be detected and the reference voltage signal provided by the reference voltage source in the application, and the reference voltage source can also be applied to a terminal or electronic equipment needing the reference voltage signal.

In one embodiment, referring to fig. 1, the reference voltage source in this embodiment includes: a reference voltage modulation circuit 110, a reference voltage output port 140, a first isolation resistor 120, and a first filter capacitor 130.

Specifically, the reference voltage modulation circuit 110 is configured to output a pulse width modulation signal; the reference voltage output port 140 is used for outputting a reference voltage signal, a first end of the first isolation resistor 120 is connected with the reference voltage modulation circuit 110, a second end of the first isolation resistor 120 is connected with the reference voltage output port 140, and the first isolation resistor 120 is used for isolating the reference voltage modulation circuit 110 and the reference voltage output port 140; the first end of the first filter capacitor 130 is connected to the second end of the first isolation resistor 120, the second end of the first filter capacitor 130 is grounded, and the first filter capacitor 130 is configured to filter the pulse width modulated signal, convert the pulse width modulated signal into a reference voltage signal, and output the reference voltage signal to the reference voltage output port 140.

In this embodiment, the reference voltage modulating circuit 110 outputs the pulse width modulating signal to the first end of the first isolation resistor 120, the first isolation resistor 120 isolates the reference voltage modulating circuit 110 and the reference voltage output port 140, the first filter capacitor 130 and the first isolation resistor 120 form an RC circuit, the first filter capacitor 130 filters the pulse width modulating signal, the pulse width modulating signal is converted into the reference voltage signal and is output to the reference voltage output port 140, the duty ratio of the pulse width modulating signal is in a proportional relation with the voltage of the reference voltage signal, and the reference voltage modulating circuit 110 outputs the pulse width modulating signals with different duty ratios, so that the voltage of the reference voltage signal can be adjusted, the purpose of adjusting the reference voltage signal without changing a hardware circuit is achieved, the same reference voltage source can be suitable for different projects and power platforms, and the universality of the signal detecting circuit is improved.

In one embodiment, the reference voltage modulation circuit 110 can adjust the duty ratio of the pulse width modulation signal according to the user requirement, and the voltage of the reference voltage signal and the duty ratio of the pulse width modulation signal are in a proportional relationship, at this time, the reference voltage modulation circuit 110 outputs the pulse width modulation signal corresponding to the duty ratio, so that the voltage of the reference voltage signal output by the reference voltage output port can be adjusted, and on the premise of not changing the hardware circuit, the voltage of the reference voltage signal is adjusted according to the design requirement and different application scenarios, so that the universality of the detection circuit can be improved, the application range of the detection circuit can be increased, the detection precision can be improved, and false triggering events caused by low detection precision can be avoided.

In one embodiment, the reference voltage modulation circuit 110 may be a PWM controller, which may be used to convert an analog voltage signal into a pulse width modulated signal, for example, by controlling the on/off of the switching device of the inverter circuit to divide the sinusoidal half-wave waveform into N equal parts, so that the sinusoidal half-wave is regarded as a waveform composed of N pulses connected to each other, so that a series of pulse signals with equal amplitudes and non-uniform widths are obtained at the output terminal.

In one embodiment, as shown in connection with fig. 2, at least one second isolation resistor 121 having the same function as the first isolation resistor 120 and at least one second filter capacitor 131 having the same function as the first filter capacitor 130 are further provided between the reference voltage output port 140 and the first isolation resistor 120.

Specifically, the second filter capacitor 131 is correspondingly connected with the second isolation resistor 121, the second isolation resistor 121 is connected in series with the first isolation resistor 120, and the second filter capacitor 131 is connected in parallel with the corresponding second isolation resistor 121.

In this embodiment, the second filter capacitors 131 are correspondingly connected with the second isolation resistors 121, and each second filter capacitor 131 and the corresponding second isolation resistor 121 form an RC circuit, so that the reference voltage signal can be subjected to secondary filtering processing, and a more stable reference voltage signal can be generated.

In one embodiment, if a plurality of second isolation resistors 121 having the same function as the first isolation resistor 120 are further disposed between the reference voltage output port 140 and the first isolation resistor 120, a plurality of second filter capacitors 131 having the same function as the first filter capacitor 130 are also required. The second filter capacitors 131 are connected with the second isolation resistors 121 in a one-to-one correspondence manner, the second isolation resistors 121 are connected in series, each second filter capacitor 131 and the corresponding second isolation resistor 121 form an RC circuit, and the RC circuits are connected in series between the reference voltage output port 140 and the first isolation resistor 120.

In one embodiment, a plurality of second isolation resistors 121 are connected in series.

In one embodiment, by setting a plurality of RC circuits in series between the reference voltage output port 140 and the first isolation resistor 120, the response time of the reference voltage signal can be increased, so as to delay the reference voltage signal, so as to adapt to an application scenario requiring delay comparison.

In one embodiment, the difference between the resistance of the second isolation resistor 121 and the resistance of the first isolation resistor 120 is no more than 5% of the resistance of the first isolation resistor 120.

In one embodiment, the resistance of the second isolation resistor 121 is equal to the resistance of the first isolation resistor 120.

In this embodiment, by setting the resistance of the second isolation resistor 121 equal to the resistance of the first isolation resistor 120, the stability of the secondary filtering process can be increased, and voltage fluctuations caused by excessively large differences in the resistances can be avoided.

In one embodiment, the capacitance value of the second filter capacitor 131 and the capacitance value of the first filter capacitor 130 do not differ by more than 5% of the capacitance value of the first filter capacitor 130.

In one embodiment, the capacitance of the second filter capacitor 131 is equal to the capacitance of the first filter capacitor 130.

In this embodiment, by setting the capacitance value of the second filter capacitor 131 equal to the capacitance value of the first filter capacitor 130, the stability of the secondary filtering process can be increased, and voltage fluctuation caused by excessively large capacitance value difference can be avoided.

In one embodiment, the reference voltage modulation circuit 110 is further configured to receive a reference voltage control signal and generate a pulse width modulation signal according to the reference voltage control signal.

In this embodiment, the duty ratio of the pulse width modulation signal can be adjusted by providing the reference voltage control signal to the reference voltage modulation circuit 110, so that the voltage of the reference voltage signal can be adjusted by controlling the duty ratio of the pulse width modulation signal, the universality of the detection circuit can be improved, the application range of the detection circuit can be increased, the detection precision can be improved by adjusting the duty ratio of the pulse width modulation signal by the reference voltage modulation circuit according to the reference voltage control signal, and false triggering events caused by low detection precision can be avoided on the premise of not changing the hardware circuit.

In one embodiment, within the reference voltage modulation circuit 110, the duty cycle of the pulse width modulated signal may be controlled by a timer or timer, for example, the timer may be used to generate a timing signal, and then the switching device may control the signal output of the dc voltage source to generate the pulse width modulated signal with the desired duty cycle.

In one embodiment, the first isolation resistor 120 has a resistance ranging from 40kΩ to 50kΩ.

In one embodiment, the capacitance of the first filter capacitor 130 ranges from 100nF to 1000nF.

The embodiment of the application further provides a signal detection circuit, referring to fig. 3, the signal detection circuit includes: the first pulse width modulation module 210, the second pulse width modulation module 310, the first resistance module 220, the second resistance module 320, the first capacitance module 230, the second capacitance module 330, the first comparison module 410, the second comparison module 420, and the detection signal terminal 401.

Specifically, the first pwm module 210 is configured to output a first pwm signal, the second pwm module 310 is configured to output a second pwm signal, a first end of the first resistor module 220 is connected to the first pwm module, a non-inverting input end of the first comparator module 410 is connected to a second end of the first resistor module 220, the first resistor module 220 is configured to isolate the first comparator module 410 from the first pwm module 210, a first end of the first capacitor module 230 is connected to the second end of the first resistor module 220, a second end of the first capacitor module 230 is grounded, and the first capacitor module 230 is configured to filter the first pwm signal and convert the first pwm signal into a first threshold voltage signal; the first end of the second resistor module 320 is connected to the second pulse width modulation module 310, the first end of the second capacitor module 330 is connected to the second end of the second resistor module 320, the second end of the second capacitor module 330 is grounded, and the second capacitor module 330 is configured to filter the second pulse width modulation signal and convert the second pulse width modulation signal into a second threshold voltage signal; the inverting input terminal of the second comparing module 420 is connected to the second terminal of the second resistor module 320, the non-inverting input terminal of the second comparing module 420 and the inverting input terminal of the first comparing module 410 are commonly connected to the detection signal terminal 401, and the second resistor module 320 is used for isolating the second comparing module 420 from the second pulse width modulation module 310.

In this embodiment, the detection signal terminal 401 is configured to be connected to a signal to be detected, the first comparing module 410 is configured to compare the signal to be detected with a first threshold voltage signal to generate a first comparing signal, the second comparing module 420 is configured to compare the signal to be detected with a second threshold voltage signal to generate a second comparing signal, and the range of the voltage of the signal to be detected can be determined by the levels of the first comparing signal and the second comparing signal.

In this embodiment, an upper limit reference signal source is formed by the first pulse width modulation module 210, the first resistor module 220 and the first capacitor module 230, a first threshold voltage signal is provided for the first comparison module 410, a lower limit reference signal source is formed by the second pulse width modulation module 310, the second resistor module 320 and the second capacitor module 330, a second threshold voltage signal is provided for the second comparison module 420, the first comparison module 410 and the second comparison module 420 form a window comparator, the signal to be detected, which is connected to the detection signal terminal 420, is compared with the first threshold voltage signal and the second threshold voltage signal to generate corresponding comparison signals, and meanwhile, the duty ratio of the first pulse width modulation signal and the second pulse width modulation signal is adjusted by the first pulse width modulation module 210 and the second pulse width modulation module 310, so that a plurality of voltage intervals are formed by adjusting the voltages of the first threshold voltage signal and the second threshold voltage signal according to different design requirements and application scenarios, and the purposes of improving the universality of the detection circuit and increasing the application range of the detection circuit are achieved.

In one embodiment, as shown in connection with fig. 4, the first comparison module 410 includes: a first comparator U1, a first pull-up resistor R2.

Specifically, the positive phase signal pin+ of the first comparator U1 is connected to the second end of the first resistor module 220, the inverted signal pin of the first comparator U1 is connected to the detection signal end 401, the output pin of the first comparator U1 and the first end of the first pull-up resistor R2 are commonly connected to the first detection output end P1, and the second end of the first pull-up resistor R2 and the power supply pin of the first comparator U1 are commonly connected to the first comparator power supply VCC1.

In this embodiment, the first comparator U1 and the first pull-up resistor R2 form a comparison circuit for comparing the signal to be detected connected to the detection signal terminal 401 with the first threshold voltage signal, since the detection signal terminal 401 is connected to the inverted signal pin of the first comparator U1, the second terminal of the first resistor module 220 is connected to the positive phase signal pin+ of the first comparator U1, when the voltage of the first threshold voltage signal is greater than the voltage of the signal to be detected, the output pin of the first comparator U1 is disconnected from the ground pin thereof, the voltage of the first detection output terminal P1 is pulled up to a high level, the first comparison signal is a high level signal at this time, and when the voltage of the first threshold voltage signal is less than the voltage of the signal to be detected, the output pin of the first comparator U1 is conducted with the ground pin thereof, and the voltage of the first detection output terminal P1 is pulled down to a low level, at this time, the first comparison signal is a low level signal.

In one embodiment, as shown in connection with fig. 4, the second comparison module 420 includes: a second comparator U2 and a second pull-up resistor R5.

The inverted signal pin of the second comparator U2 is connected to the second end of the second resistor module 320, the positive phase signal pin of the second comparator U2 is + connected to the detection signal end 401, the output pin of the second comparator U2 and the first end of the second pull-up resistor R5 are commonly connected to the second detection output end P2, and the second end of the second pull-up resistor R5 and the power supply pin of the second comparator U2 are commonly connected to the second comparator power supply VCC2.

In this embodiment, the second comparator U2 and the second pull-up resistor R5 form a comparison circuit for comparing the signal to be detected connected to the detection signal terminal 401 with the second threshold voltage signal, since the detection signal terminal 401 is connected to the positive phase signal pin+ of the second comparator U2, the second terminal of the second resistor module 320 is connected to the inverted signal pin+ of the second comparator U2, when the voltage of the second threshold voltage signal is greater than the voltage of the signal to be detected, the output pin of the second comparator U2 is conducted with the ground pin thereof, the voltage of the second detection output terminal P2 is pulled down to a low level, the second comparison signal is a low level signal, when the voltage of the second threshold voltage signal is less than the voltage of the signal to be detected, the output pin of the second comparator U2 is disconnected from the ground pin thereof, and the voltage of the second detection output terminal P2 is pulled up to a high level, at this time, the second comparison signal is a high level signal.

In this embodiment, the first comparing module 410 and the second comparing module 420 form a window comparator, compare the signal to be detected accessed by the detecting signal terminal 401 with the first threshold voltage signal and the second threshold voltage signal, generate corresponding comparison signals, and adjust the duty ratio of the first pulse width modulation signal and the second pulse width modulation signal by the first pulse width modulation module 210 and the second pulse width modulation module 310 at the same time, and adjust the voltages of the first threshold voltage signal and the second threshold voltage signal according to different design requirements and application scenarios, thereby improving the universality of the detecting circuit and increasing the application range of the detecting circuit.

In this embodiment, a window comparator is formed by the first comparing module 410 and the second comparing module 420, which can solve the problem of damaging the subsequent circuit when the critical value is repeatedly hopped compared with the comparing circuit with the critical value alone.

In one embodiment, as shown in fig. 5, at least one first isolation module 221 having the same function as the first resistor module 220 and at least one first filter module 230 having the same function as the first capacitor module 230 are further disposed between the first resistor module 220 and the first comparison module 410.

In this embodiment, the first filtering module 231 is correspondingly connected to the first isolation module 221, the first isolation module 221 is connected in series with the first resistor module 220, and the first filtering module 231 is connected in parallel with the corresponding first isolation module 221. By adding at least one RC circuit composed of the first isolation module 221 and the first filtering module 231 between the first resistance module 220 and the first comparison module 410, the second filtering process on the first threshold voltage signal can be implemented, and a more stable first threshold voltage signal can be generated.

In one embodiment, if the number of the first isolation modules 221 is plural, the plural first isolation modules 221 are connected in series.

In one embodiment, the difference between the resistance of the first isolation module 221 and the resistance of the first resistance module 220 is not more than 5% of the resistance of the first resistance module 220.

In one embodiment, the resistance of the first isolation module 221 is equal to the resistance of the first resistor module 220.

In the technical solution of the embodiment of the present application, by setting the resistance of the first isolation module 221 equal to the resistance of the first resistor module 220, the stability of the secondary filtering process can be increased, and the voltage fluctuation generated by the overlarge phase difference of the resistance can be avoided.

In one embodiment, the capacitance value of the first filter module 231 and the capacitance value of the first capacitor module 230 do not differ by more than 5% of the capacitance value of the first capacitor module 230.

In one embodiment, the capacitance of the first filter module 231 is equal to the capacitance of the first capacitor module 230.

In the technical solution of this embodiment of the present application, by setting the capacitance value of the first filtering module 231 equal to the capacitance value of the first capacitance module 230, the stability of the secondary filtering process can be increased, and the voltage fluctuation caused by the overlarge capacitance value phase difference is avoided.

In one embodiment, as shown in connection with fig. 5, at least one second isolation module 321 having the same function as the second resistor module 320 and at least one second filter module 331 having the same function as the second capacitor module 330 are further disposed between the second resistor module 320 and the second comparator module 420.

In this embodiment, the second filter module 331 is correspondingly connected to the second isolation module 321, the second isolation module 321 is connected in series with the second resistor module 320, and the second filter module 331 is connected in parallel with the corresponding second isolation module 321. By adding at least one RC circuit composed of the second filtering module 331 and the second isolating module 321 between the second resistance module 320 and the second comparing module 420, the second threshold voltage signal can be subjected to the secondary filtering process, so as to generate a more stable second threshold voltage signal.

In one embodiment, if the number of the second isolation modules 321 is plural, the plural second isolation modules 321 are connected in series.

In one embodiment, the difference between the resistance of the second isolation module 321 and the resistance of the second resistance module 320 is not more than 5% of the resistance of the second resistance module 320.

In one embodiment, the resistance of the second isolation module 321 is equal to the resistance of the second resistor module 320.

In this embodiment, by setting the resistance of the second isolation module 321 equal to the resistance of the second resistor module 320, the stability of the secondary filtering process can be increased, and voltage fluctuation caused by excessively large phase difference between the resistances can be avoided.

In one embodiment, the difference between the capacitance of the second filter module 331 and the capacitance of the second capacitance module 330 is no more than 5% of the capacitance of the second capacitance module 330.

In one embodiment, the capacitance of the second filter module 331 is equal to the capacitance of the second capacitor module 330.

In this embodiment, by setting the capacitance value of the second filtering module 331 to be equal to the capacitance value of the second capacitance module 330, the stability of the secondary filtering process can be increased, and voltage fluctuation caused by excessively large capacitance value difference can be avoided.

In one embodiment, referring to fig. 6, the signal detection circuit in this embodiment further includes a main control module 500.

Specifically, the main control module 500 is connected to the first comparison module 410 and the second comparison module 420, and the main control module 500 is configured to receive the first comparison signal and the second comparison signal, and generate a monitoring signal according to the first comparison signal and the second comparison signal.

In this embodiment, the first comparing module 410 and the second comparing module 420 form a window comparator, the signal to be detected accessed by the detecting signal terminal 401 is compared with the first threshold voltage signal and the second threshold voltage signal, the first comparing module 410 outputs the first comparing signal, the second comparing module 420 outputs the second comparing signal, and whether the signal to be detected exceeds the threshold voltage range formed by the first threshold voltage signal and the second threshold voltage signal can be determined by detecting the level of the first comparing signal and the second comparing signal, so that whether the signal to be detected is over-voltage or not is judged.

Further, in this embodiment, the voltage of the first threshold voltage signal and the voltage of the second threshold voltage signal may be controlled by setting the duty ratio of the first pulse width modulation signal and the duty ratio of the second pulse width modulation signal, so that the signal to be detected is respectively compared with the first threshold voltage signal and the second threshold voltage signal without changing the hardware condition, and then the voltage interval of the signal to be detected is determined by the main control module based on the levels of the first comparison signal and the second comparison signal, so as to achieve the purpose of determining whether the signal to be detected is over-voltage without changing the hardware condition.

In one embodiment, referring to fig. 7, the main control module 500 is connected to the first pulse width modulation module 210 and the second pulse width modulation module 220, respectively, and is configured to output a first pulse width control signal to the first pulse width modulation module 210 and output a second pulse width control signal to the second pulse width modulation module 220.

In this embodiment, the first pwm module 210 generates a first pwm signal according to the first pwm signal, and the second pwm module 220 generates a second pwm signal according to the second pwm signal.

The main control module 500 outputs a first pulse width control signal to the first pulse width modulation module 210 and outputs a second pulse width control signal to the second pulse width modulation module 220, so that the first pulse width modulation module 210 is controlled to adjust the duty ratio of the first pulse width modulation signal, the second pulse width modulation module 220 is controlled to control the duty ratio of the second pulse width modulation signal, and then the main control module can adjust the duty ratio of the first pulse width modulation signal and the duty ratio of the second pulse width modulation signal according to different design requirements and application scenes to adjust the voltages of the first threshold voltage signal and the second threshold voltage signal, so that the universality of a detection circuit is improved, the application range of the detection circuit is increased, the detection precision is improved by adjusting the duty ratio of the first pulse width modulation signal and the duty ratio of the second pulse width modulation signal, and false triggering events caused by low detection precision are avoided.

In one embodiment, the main control module 500 is further configured to control the duty cycle of the first pulse width modulation signal output by the first pulse width modulation module 210 to be complementary to the duty cycle of the second pulse width modulation signal output by the second pulse width modulation module 220, and the duty cycle of the first pulse width modulation signal is greater than the duty cycle of the second pulse width modulation signal.

In this embodiment, by setting the duty ratio of the first pulse width modulation signal to be larger than the duty ratio of the second pulse width modulation signal, the voltage of the first threshold voltage signal can be controlled to be larger than the voltage of the second threshold voltage signal, so that the first threshold voltage signal is set as the upper limit threshold voltage of the window comparator, and the second threshold voltage signal is set as the lower limit threshold voltage of the window comparator, thereby achieving the purpose of comparing the signal to be detected with the threshold voltage range without changing hardware conditions.

In one embodiment, when the voltage of the first threshold voltage signal is greater than the voltage of the signal to be detected, the first comparison module 410 outputs a high level first comparison signal, and when the voltage of the first threshold voltage signal is less than the voltage of the signal to be detected, the first comparison module 410 outputs a low level first comparison signal. The second comparing module 420 outputs a low-level second comparing signal when the voltage of the second threshold voltage signal is greater than the voltage of the signal to be detected, and the second comparing module 420 outputs a high-level second comparing signal when the voltage of the second threshold voltage signal is less than the voltage of the signal to be detected. Therefore, if the main control module 500 detects that the first comparison signal is a high level signal and the second comparison signal is a high level signal, it can be determined that the voltage of the signal to be detected is within the threshold voltage range.

In one embodiment, if the signal to be detected is a current sampling signal, when the main control module 500 detects that the first comparison signal is a high level signal, the main control module 500 may determine that the detected current is not flowing excessively.

In one embodiment, if the main control module 500 detects that the first comparison signal is a low level signal, the main control module 500 may determine that the detected current flows.

In one embodiment, if the main control module 500 detects that the second comparison signal is a low level signal, the voltage of the current sampling signal is lower than the lower limit value of the threshold voltage range.

In one embodiment, the main control module 500 may be an and gate, and when the first comparison signal is a high level signal and the second comparison signal is a high level signal, the main control module 500 outputs a high level monitor signal for indicating that the voltage of the signal to be detected is within the threshold voltage range.

In one embodiment, the master control module 500 is further configured to control the sum of the duty cycle of the first pwm signal output by the first pwm module 210 and the duty cycle of the second pwm signal output by the second pwm module 220 to be equal to 1.

The embodiment of the application also provides electronic equipment, which comprises the reference voltage source according to any one of the embodiments.

In this embodiment, a voltage signal source is disposed in the electronic device, where the voltage signal source may be a reference voltage source according to any one of the foregoing embodiments, and is configured to provide a reference voltage signal for the electronic device.

In a specific application embodiment, a comparison circuit may be further provided in the electronic device, and the reference voltage source in the above embodiment provides a reference voltage signal for the comparison circuit.

In an embodiment, the electronic device comprises a signal detection circuit as described in any of the embodiments above.

In one embodiment, the electronic device may be an overcurrent detection device, configured to monitor the current on the line, and send a current sampling signal sampled by the monitoring to the signal detection circuit in the foregoing embodiment to perform an overcurrent determination.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the terminal embodiments described above are merely illustrative. For example, the division of a module or unit is merely a logical function division, and there may be another division manner when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other forms.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. A reference voltage source, the reference voltage source comprising:

a reference voltage output port;

2. The reference voltage source of claim 1, wherein at least one second isolation resistor and at least one second filter capacitor are further provided between the reference voltage output port and the first isolation resistor;

3. The reference voltage source of claim 2, wherein the second isolation resistor has a resistance equal to a resistance of the first isolation resistor.

4. The reference voltage source of claim 2, wherein the capacitance of the second filter capacitor is equal to the capacitance of the first filter capacitor.

5. The reference voltage source of any one of claims 1-4 wherein the reference voltage modulation circuit is further configured to receive a reference voltage control signal and to generate the pulse width modulated signal based on the reference voltage control signal.

6. A signal detection circuit, the signal detection circuit comprising:

7. The signal detection circuit of claim 6, wherein the first comparison module comprises: a first comparator, a first pull-up resistor;

8. The signal detection circuit of claim 6, wherein the second comparison module comprises: a second comparator, a second pull-up resistor;

9. The signal detection circuit according to any one of claims 6 to 8, wherein at least one first isolation module having the same function as the first resistor module and at least one first filter module having the same function as the first capacitor module are further provided between the first resistor module and the first comparator module;

10. The signal detection circuit of claim 9, wherein the resistance of the first isolation module is equal to the resistance of the first resistance module.

11. The signal detection circuit of claim 9, wherein the capacitance of the first filter module is equal to the capacitance of the first capacitor module.

12. The signal detection circuit according to any one of claims 6 to 8, wherein at least one second isolation module having the same function as the second resistance module and at least one second filter module having the same function as the second capacitance module are further provided between the second resistance module and the second comparison module;

13. The signal detection circuit of claim 12, wherein the resistance of the second isolation module is equal to the resistance of the second resistance module.

14. The signal detection circuit of claim 12, wherein the capacitance of the second filter module is equal to the capacitance of the second capacitor module.

15. The signal detection circuit according to any one of claims 6 to 8, wherein the signal detection circuit further comprises:

16. The signal detection circuit of claim 15, wherein the master control module is further coupled to the first pulse width modulation module and the second pulse width modulation module for outputting a first pulse width control signal to the first pulse width modulation module and a second pulse width control signal to the second pulse width modulation module;

17. The signal detection circuit of claim 15, wherein the master control module is further configured to control the duty cycle of the first pulse width modulated signal output by the first pulse width modulated module to be complementary to the duty cycle of the second pulse width modulated signal output by the second pulse width modulated module, and the duty cycle of the first pulse width modulated signal is greater than the duty cycle of the second pulse width modulated signal.

18. The signal detection circuit of claim 15, wherein the master control module is further configured to control a sum of a duty cycle of the first pulse width modulated signal output by the first pulse width modulation module and a duty cycle of the second pulse width modulated signal output by the second pulse width modulation module to be equal to 1.

19. An electronic device comprising a reference voltage source as claimed in any one of claims 1-5; or the electronic device comprises a signal detection circuit as claimed in any one of claims 6-18.