CN216387191U - Voltage detection circuit - Google Patents
Voltage detection circuit Download PDFInfo
- Publication number
- CN216387191U CN216387191U CN202122651371.4U CN202122651371U CN216387191U CN 216387191 U CN216387191 U CN 216387191U CN 202122651371 U CN202122651371 U CN 202122651371U CN 216387191 U CN216387191 U CN 216387191U
- Authority
- CN
- China
- Prior art keywords
- voltage
- circuit
- switch tube
- control
- control circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The embodiment of the utility model discloses a voltage detection circuit, which comprises a first power supply, a first voltage division circuit, a second voltage division circuit and a control circuit. The first end of the first voltage division circuit is connected with a first power supply, the second end of the first voltage division circuit is respectively connected with the first end of the second voltage division circuit and the detection end of the control circuit, and the second end of the second voltage division circuit is connected with the control end of the control circuit. The control circuit is used for setting the voltage of the control end of the control circuit to be the first voltage, the detection end of the control circuit detects the second voltage generated by the second end of the first voltage division circuit, and the control circuit is also used for setting the voltage of the control end of the control circuit to be the voltage of the first power supply. The voltage detection circuit can reduce the system power consumption and save the system design cost.
Description
Technical Field
The embodiment of the utility model relates to the technical field of electronic circuits, in particular to a voltage detection circuit.
Background
The intelligent device using the microprocessor as the main control unit is widely applied to aspects of human life. In the operation process of such intelligent devices, the voltage state of the power supply of the intelligent devices needs to be closely monitored, so as to prevent the intelligent devices from being incapable of normally operating due to too low power supply voltage or power loss.
The existing voltage detection circuit consumes larger electric quantity in the voltage detection period and the non-voltage detection period, which is not beneficial to reducing the power consumption of the intelligent device.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a voltage detection circuit which can reduce the power consumption of a system and save the design cost of the system.
The embodiment of the utility model adopts a technical scheme that: provided is a voltage detection circuit including: the power supply comprises a first power supply, a first voltage division circuit, a second voltage division circuit and a control circuit.
The first end of the first voltage division circuit is connected with a first power supply, the second end of the first voltage division circuit is respectively connected with the first end of the second voltage division circuit and the detection end of the control circuit, and the second end of the second voltage division circuit is connected with the control end of the control circuit.
The control circuit is used for setting the voltage of the control end of the control circuit to be the first voltage, the detection end of the control circuit detects the second voltage generated by the second end of the first voltage division circuit, and the control circuit is also used for setting the voltage of the control end of the control circuit to be the voltage of the first power supply.
In some embodiments, the first voltage divider circuit includes a first resistor and the second voltage divider circuit includes a second resistor.
The first end of the first resistor is connected with the first power supply, the second end of the first resistor is connected with the first end of the second resistor and the detection end of the control circuit, and the second end of the second resistor is connected with the control end of the control circuit.
In some embodiments, the resistance of the first resistor is equal to the resistance of the second resistor.
In some embodiments, the control circuit includes an output circuit, an inverter, a first switch tube and a second switch tube.
The output circuit is connected with the input end of the phase inverter, the output end of the phase inverter is respectively connected with the first end of the first switch tube and the first end of the second switch tube, the second end of the first switch tube is connected with the first power supply, the second end of the second switch tube is grounded, the third end of the first switch tube is connected with the third end of the second switch tube, and the third end of the first switch tube and the third end of the second switch tube are used as control ends.
The output circuit is used for outputting a first level signal to the input end of the inverter so as to enable the voltage of the control end to be a first voltage, and the output circuit is used for outputting a second level signal to the input end of the inverter so as to enable the voltage of the control end to be the voltage of the first power supply.
In some embodiments, the first switch tube is an NMOS tube, and the first end, the second end, and the third end of the first switch tube correspond to the gate, the drain, and the source of the NMOS tube, respectively; the second switch tube is a PMOS tube, and the first end, the second end and the third end of the second switch tube respectively correspond to the grid electrode, the drain electrode and the source electrode of the PMOS tube.
In some embodiments, the first switch tube is an NPN-type transistor, and the first end, the second end, and the third end of the first switch tube correspond to a base, a collector, and an emitter of the NPN-type transistor, respectively; the second switch tube is a PNP type triode, and a first end, a second end and a third end of the second switch tube respectively correspond to a base electrode, a collector electrode and an emitting electrode of the PNP type triode.
In some embodiments, the voltage detection circuit further comprises a display unit. The display unit is connected with the control circuit and used for displaying the second voltage.
In some embodiments, the display unit is an LED display screen or an LCD display screen.
In some embodiments, the voltage detection circuit further comprises an alarm unit, the alarm unit is connected with the control circuit, and the control circuit is further configured to control the alarm unit to give an alarm when the second voltage exceeds a preset range.
In some embodiments, the alarm unit is a buzzer or an indicator light.
Different from the prior art, an embodiment of the present invention provides a voltage detection circuit, where the circuit includes a first power supply, a first voltage-dividing circuit, a second voltage-dividing circuit and a control circuit, a second end of the second voltage-dividing circuit is connected to a control end of the control circuit, when voltage detection is required, the control circuit outputs a first voltage to the control end thereof so as to enable the second end of the first voltage-dividing circuit to generate a second voltage, and when voltage detection is not required, the control circuit outputs a voltage of the first power supply to the control end thereof so as to enable a current flowing through the first voltage-dividing circuit and the second voltage-dividing circuit to be almost zero, thereby reducing power consumption of the system; and other components or functional modules are not required to be added on the basis of the first voltage division circuit, the second voltage division circuit and the control circuit, so that the design cost of the system is reduced.
Drawings
One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.
FIG. 1 is a schematic block diagram of a voltage detection circuit provided in an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a voltage detection circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a voltage detection circuit according to another embodiment of the present invention;
fig. 4 is a schematic block diagram of a voltage detection circuit according to another embodiment of the present invention.
Detailed Description
The present application will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present application, but are not intended to limit the utility model in any way. It should be noted that various changes and modifications can be made by one skilled in the art without departing from the spirit of the application. All falling within the scope of protection of the present application.
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. 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 in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It should be noted that, if not conflicted, the various features of the embodiments of the utility model may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.
In a first aspect, referring to fig. 1, fig. 1 is a schematic structural diagram of a voltage detection circuit according to an embodiment of the present invention, where the voltage detection circuit 10 includes: a first power supply 100, a first voltage divider circuit 200, a second voltage divider circuit 300, and a control circuit 400.
A first terminal of the first voltage dividing circuit 200 is connected to the first power supply 100, a second terminal of the first voltage dividing circuit 200 is connected to a first terminal of the second voltage dividing circuit 300 and a detection terminal of the control circuit 400, respectively, and a second terminal of the second voltage dividing circuit 300 is connected to a control terminal of the control circuit 400.
The control circuit 400 is configured to set the voltage of the control terminal thereof to the first voltage, and the detection terminal thereof detects the second voltage generated by the second terminal of the first voltage dividing circuit 200. The control circuit 400 is also used to set the voltage of its control terminal to the voltage of the first power supply 100.
The specific operation principle of the voltage detection circuit 10 is as follows:
when the voltage of the first power supply 100 does not need to be detected, the control circuit 400 sets the voltage of the control terminal thereof to the voltage of the first power supply 100, at this time, the voltage of the first terminal of the first voltage divider 200 is equal to the voltage of the second terminal of the second voltage divider 300, the voltage difference between the first terminal of the first voltage divider 200 and the second terminal of the second voltage divider 300 is zero, no current flows through the first voltage divider and the second voltage divider, and at this time, the energy consumed by the first voltage divider and the second voltage divider is zero; when the voltage of the first power supply 100 needs to be detected, the control circuit 400 sets the voltage of the control terminal thereof to be a first voltage, and the first voltage is lower than the voltage of the first power supply 100, in some embodiments, the first voltage may be zero, and at this time, a voltage difference is formed between the first terminal of the first voltage dividing circuit 200 and the second terminal of the second voltage dividing circuit 300, so that the first power supply 100, the first voltage dividing circuit 200, the second voltage dividing circuit 300 and the control terminal of the control circuit 400 form a loop, a current flows through the first voltage dividing circuit 200 and the second voltage dividing circuit 300, and a second voltage is generated at the second terminal of the first voltage dividing circuit 200 and transmitted to the detection terminal of the control circuit 400, thereby achieving the effect of detecting the voltage of the first power supply 100.
Different from the prior art, an embodiment of the present invention provides a voltage detection circuit, which includes a first power supply, a first voltage-dividing circuit, a second voltage-dividing circuit and a control circuit, wherein a second end of the second voltage-dividing circuit is connected to a control end of the control circuit, when voltage detection is required, the control circuit outputs a first voltage to the control end thereof to enable the second end of the first voltage-dividing circuit to generate a second voltage, and when voltage detection is not required, the control circuit outputs a voltage of the first power supply to the control end thereof to enable currents flowing through the first voltage-dividing circuit and the second voltage-dividing circuit to be zero, so that the first voltage-dividing circuit and the second voltage-dividing circuit do not consume electric power during the period in which voltage detection is not required, and power consumption of a system is reduced; and other components or functional modules are not required to be added on the basis of the first voltage division circuit, the second voltage division circuit and the control circuit, so that the design cost of the system is reduced.
In some embodiments, referring to fig. 2, the first voltage divider circuit 200 includes a first resistor R1, the second voltage divider circuit 200 includes a second resistor R2, a first terminal of the first resistor R1 is connected to the first power VCC, a second terminal of the first resistor R1 is connected to a first terminal of the second resistor R2 and a detection terminal of the control circuit 400, and a second terminal of the second resistor R2 is connected to a control terminal of the control circuit 400. The first voltage dividing circuit 200 and the second voltage dividing circuit 300 are implemented by using resistors, so that the circuit structure of the voltage detection circuit can be simplified, and the cost is reduced.
In some embodiments, the first resistor R1 has a resistance equal to the second resistor R2. Setting the resistance value of the first resistor R1 to be the same as the resistance value of the second resistor R2 makes calculation of the detected second voltage by the control circuit 400 simpler.
In other embodiments, the resistances of the first resistor R1 and the second resistor R2 may be different.
In some embodiments, referring to fig. 2 again, the control circuit 400 includes an output circuit 4001, an inverter U1, a first switch Q1, and a second switch Q2.
The output circuit 4001 is connected to an input terminal of the inverter U1, an output terminal of the inverter U1 is connected to a first terminal of the first switch Q1 and a first terminal of the second switch Q2, a second terminal of the first switch Q1 is connected to the first power VCC, a second terminal of the second switch Q2 is grounded, a third terminal of the first switch Q1 is connected to a third terminal of the second switch Q2, and the third terminal of the first switch Q1 and the third terminal of the second switch Q2 are used as control terminals.
The output circuit 4001 is configured to output a first level signal to an input terminal of the inverter U1 such that a voltage of the control terminal is a first voltage, and the output circuit 4001 is configured to output a second level signal to an input terminal of the inverter U1 such that a voltage of the control terminal is a voltage of the first power VCC.
The voltage of the control end is controlled by the output circuit 4001, the inverter U1, the first switch tube Q1 and the second switch tube Q2, so that the voltage control circuit has the advantages of high working efficiency, good voltage output characteristic and simple driving circuit.
In some embodiments, referring to fig. 2 again, the first switch Q1 is an NPN transistor, and the first terminal, the second terminal and the third terminal of the first switch Q1 correspond to the base, the collector and the emitter of the NPN transistor, respectively; the second switch tube Q2 is a PNP type triode, and the first end, the second end and the third end of the second switch tube Q2 correspond to the base, the collector and the emitter of the PNP type triode, respectively. The triode has the advantages of fast switching action, sensitive response, no jump in the operation process and low price, thereby further saving the design cost.
In other embodiments, the first switch Q1 may also be an NMOS transistor, and the second switch Q2 may also be a PMOS transistor, wherein the first terminal, the second terminal, and the third terminal of the first switch Q1 respectively correspond to the gate, the drain, and the source of the NMOS transistor, and the first terminal, the second terminal, and the third terminal of the second switch Q2 respectively correspond to the gate, the drain, and the source of the PMOS transistor. Compared with a triode, the MOS tube has the advantages of low power consumption, capability of passing large current and the like.
In some embodiments, referring to fig. 2 again, fig. 2 shows a circuit structure diagram of a voltage detection circuit. The voltage detection circuit comprises a first power supply VCC, a first voltage division circuit, a second voltage division circuit and a control circuit, wherein the first voltage division circuit comprises a first resistor R1, the second voltage division circuit comprises a second resistor R2, and the control circuit comprises an NPN type triode Q1, a PNP type triode Q2, an inverter U1 and an output circuit.
The first end of the first resistor R1 is connected with a first power supply VCC, the second end of the first resistor R1 is respectively connected with the first end of the second resistor R2 and the detection end of the control circuit, the second end of the second resistor R2 is respectively connected with the emitting electrode of the NPN type triode Q1 and the emitting electrode of the PNP type triode Q2, the collector electrode of the NPN type triode Q1 is connected with the first power supply VCC, the base electrode of the NPN type triode Q1 is respectively connected with the base electrode of the PNP type triode Q2 and the output end of the inverter U1, the collector electrode of the PNP type triode is grounded, the input end of the inverter U1 is connected with the output end of the output circuit 4001, and the input end of the output circuit is connected with the first power supply VCC.
The working principle of the voltage detection circuit is as follows:
when voltage detection needs to be carried out on the first power supply VCC, the output circuit outputs a high-level signal to the inverter U1, the high-level signal is changed into a low-level signal through the inverter U1, the NPN type triode Q1 is cut off, the PNP type triode Q2 is conducted, the second end of the second resistor R2 is grounded, the first resistor R1 and the second resistor R2 form a loop with the first power supply VCC, and the voltage value of the first power supply VCC can be obtained after conversion is carried out on the voltage acquired by the second end of the first resistor R1 through the principle of a voltage dividing circuit.
When the voltage detection of the first power source VCC is not needed, the output circuit outputs a low level signal to the inverter U1, the low level signal is changed into a high level signal through the inverter U1, so that the NPN type triode Q1 is turned on, the PNP type triode Q2 is turned off, the voltage of the second end of the second resistor R2 is also the voltage of the first power source VCC, that is, the voltage values of the first end of the first resistor R1 and the second end of the second resistor R2 are equal, at this time, no current flows through the first resistor R1 and the second resistor R2, and therefore, when the voltage detection is not performed, the power consumption is zero.
In some embodiments, referring to fig. 3, the control circuit 400 includes a single-chip microcomputer. The single chip microcomputer has strong functions, low price and excellent cost performance; the integration level is high, the volume is small, and the reliability is good; and the power consumption is low, and the expansion is easy.
In a second aspect, referring to fig. 4, fig. 4 shows a schematic structural diagram of another voltage detection circuit, and the voltage detection circuit 10 further includes a display unit 500.
The display unit 500 is connected to the control circuit 400, and the display unit 500 is used for displaying the second voltage. The second voltage is displayed in real time through the display unit 500 so that the user can know the voltage of the first power supply 100 in real time.
In some embodiments, the display unit 500 may be an LED display screen, an LCD display screen, or the like, which is not limited herein.
In some embodiments, referring again to fig. 4, the voltage detection circuit 10 further includes an alarm unit 600.
The alarm unit 600 is connected to the control circuit 400, and the control circuit 400 is further configured to control the alarm unit 600 to issue an alarm when the second voltage exceeds a preset range. Through the alarm issued by the alarm unit 600, the user can know the abnormality of the voltage of the first power supply 100 in time, and thus take certain measures in time to avoid the equipment from being damaged.
In some embodiments, the alarm unit 600 is a buzzer, an indicator light, or the like, and is not limited herein.
It should be noted that the description of the present invention and the accompanying drawings illustrate preferred embodiments of the present invention, but the present invention may be embodied in many different forms and is not limited to the embodiments described in the present specification, which are provided as additional limitations to the present invention and to provide a more thorough understanding of the present disclosure. Moreover, the above technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention described in the specification; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. A voltage detection circuit, comprising:
the power supply comprises a first power supply, a first voltage division circuit, a second voltage division circuit and a control circuit;
a first end of the first voltage division circuit is connected with the first power supply, a second end of the first voltage division circuit is respectively connected with a first end of the second voltage division circuit and a detection end of the control circuit, and a second end of the second voltage division circuit is connected with a control end of the control circuit;
the control circuit is used for setting the voltage of the control end to be a first voltage, and the detection end detects a second voltage generated by the second end of the first voltage division circuit;
the control circuit is further configured to set a voltage of the control terminal to a voltage of the first power supply.
2. The voltage detection circuit of claim 1, wherein the first voltage divider circuit comprises a first resistor, the second voltage divider circuit comprises a second resistor, a first end of the first resistor is connected to the first power supply, a second end of the first resistor is connected to a first end of the second resistor and a detection end of the control circuit, respectively, and a second end of the second resistor is connected to a control end of the control circuit.
3. The voltage detection circuit of claim 2, wherein the first resistor has a resistance equal to the second resistor.
4. The voltage detection circuit of claim 1, wherein the control circuit comprises an output circuit, an inverter, a first switch tube and a second switch tube;
the output circuit is connected with the input end of the phase inverter, the output end of the phase inverter is respectively connected with the first end of the first switch tube and the first end of the second switch tube, the second end of the first switch tube is connected with the first power supply, the second end of the second switch tube is grounded, the third end of the first switch tube is connected with the third end of the second switch tube, and the third end of the first switch tube and the third end of the second switch tube are used as the control ends;
the output circuit is used for outputting a first level signal to an input end of the inverter so that the voltage of the control end is a first voltage, and the output circuit is used for outputting a second level signal to the input end of the inverter so that the voltage of the control end is the voltage of the first power supply.
5. The voltage detection circuit of claim 4, wherein the first switch tube is an NMOS tube, and the first end, the second end and the third end of the first switch tube correspond to a gate, a drain and a source of the NMOS tube, respectively; the second switch tube is a PMOS tube, and a first end, a second end and a third end of the second switch tube respectively correspond to a grid electrode, a drain electrode and a source electrode of the PMOS tube.
6. The voltage detection circuit according to claim 4, wherein the first switch tube is an NPN-type triode, and the first end, the second end and the third end of the first switch tube correspond to a base electrode, a collector electrode and an emitter electrode of the NPN-type triode respectively; the second switch tube is a PNP type triode, and a first end, a second end and a third end of the second switch tube respectively correspond to a base electrode, a collector electrode and an emitting electrode of the PNP type triode.
7. The voltage detection circuit of claim 1, further comprising a display unit, the display unit being connected to the control circuit, the display unit being configured to display the second voltage.
8. The voltage detection circuit of claim 7, wherein the display unit is an LED display screen or an LCD display screen.
9. The voltage detection circuit of claim 1, further comprising an alarm unit, wherein the alarm unit is connected to the control circuit, and the control circuit is further configured to control the alarm unit to issue an alarm when the second voltage exceeds a preset range.
10. The voltage detection circuit of claim 9, wherein the alarm unit is a buzzer or an indicator light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122651371.4U CN216387191U (en) | 2021-11-01 | 2021-11-01 | Voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122651371.4U CN216387191U (en) | 2021-11-01 | 2021-11-01 | Voltage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216387191U true CN216387191U (en) | 2022-04-26 |
Family
ID=81248816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122651371.4U Active CN216387191U (en) | 2021-11-01 | 2021-11-01 | Voltage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216387191U (en) |
-
2021
- 2021-11-01 CN CN202122651371.4U patent/CN216387191U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9110651B2 (en) | Electronic device for detecting consumption of power | |
| US6437575B1 (en) | Low-voltage detecting circuit | |
| CN104459305A (en) | Power detection circuit | |
| CN216387191U (en) | Voltage detection circuit | |
| CN207488440U (en) | Pulse generating circuit and power tube test device | |
| CN117269851A (en) | Terminal grafting detection device | |
| CN111934666A (en) | Key circuit with system awakening function and specific function | |
| CN206671419U (en) | A kind of current measurement system | |
| CN203326576U (en) | Switch power supply over-current protection circuit | |
| CN212726976U (en) | Display outage system and display | |
| CN209913795U (en) | Wake-up circuit and electronic equipment | |
| CN203324366U (en) | Power supply voltage detection circuit | |
| CN210894497U (en) | Ammeter system | |
| CN2643330Y (en) | Digital cell with liquid crystal display | |
| CN203587758U (en) | Test device of intelligent power module | |
| CN112198349A (en) | Electric meter | |
| CN220983749U (en) | Multi-key detection composite startup and shutdown circuit and electronic equipment | |
| CN211477437U (en) | Multi-path low-power-consumption temperature acquisition circuit | |
| CN216902210U (en) | Multiplex signal input circuit, control unit and electronic device | |
| CN218724392U (en) | Low-power-consumption multifunctional radar flowmeter | |
| CN219018791U (en) | Time-sharing multiplexing circuit for key detection and level detection | |
| CN219328880U (en) | Power supply and power failure detection circuit thereof | |
| CN220775386U (en) | Switch circuit with high-temperature protection function | |
| CN213988252U (en) | Zero-power-consumption standby circuit applied to LED display screen | |
| CN112486060B (en) | Reset circuit, circuit board and electronic product of singlechip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |