CN220440401U - Charging circuit and video monitoring equipment - Google Patents
Charging circuit and video monitoring equipment Download PDFInfo
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- CN220440401U CN220440401U CN202321943355.5U CN202321943355U CN220440401U CN 220440401 U CN220440401 U CN 220440401U CN 202321943355 U CN202321943355 U CN 202321943355U CN 220440401 U CN220440401 U CN 220440401U
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- 238000012544 monitoring process Methods 0.000 title abstract description 10
- 238000001514 detection method Methods 0.000 claims abstract description 123
- 239000003990 capacitor Substances 0.000 claims description 50
- 238000012806 monitoring device Methods 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 14
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 8
- 229910052744 lithium Inorganic materials 0.000 description 8
- 238000001914 filtration Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a charging circuit and video monitoring equipment, which relate to the technical field of video monitoring, and the circuit comprises: the voltage range detection circuit and the boost charging circuit of series connection, the load is all connected to boost charging circuit and voltage range detection circuit, and boost charging circuit connects first power, and voltage range detection circuit connects the second power, wherein: the voltage range detection circuit is used for generating a voltage detection signal based on the output voltage of the second power supply, and enabling the charging circuit to charge the load based on the second power supply and the voltage range detection circuit under the condition that the output voltage of the second power supply meets a preset range; the boost charging circuit is used for enabling the charging circuit to charge the load based on the first power supply and the boost charging circuit under the condition that the output voltage of the second power supply does not meet the preset range. The utility model can increase the load time.
Description
Technical Field
The present utility model relates to the field of video monitoring technologies, and in particular, to a charging circuit and a video monitoring device.
Background
In the monitoring industry, the outdoor application scene of the network camera is more, and when the network camera is detected or debugged in the outdoor scene, the network camera needs to be connected with the aid of a computer, so that the operation is more complicated. In order to solve the problem of debugging or checking the working state of the network camera, the engineering treasure product is provided, and the working state of the network camera can be checked and debugged conveniently through a terminal application program through a local area network of the engineering treasure product.
In the prior art, a DC12V input detection voltage port and a 12V output voltage port are arranged on the engineering treasure product, the 12V output voltage port is connected with a load and supplies power for the load, and a lithium battery is arranged in the engineering treasure product to supply power, namely, the output voltage of the lithium battery is boosted to 12V to supply power for the 12V output voltage port. However, when the load carried by the 12V output voltage port is large, the carrying time is short due to the limited capacity of the lithium battery.
Disclosure of Invention
The utility model provides a charging circuit and video monitoring equipment, which are used for solving the defect of short load duration when boosting power supply is performed by a lithium battery in the prior art and increasing the load duration.
The utility model provides a charging circuit, which comprises a voltage range detection circuit and a boost charging circuit which are connected in series, wherein the boost charging circuit and the voltage range detection circuit are both connected with a load, the boost charging circuit is connected with a first power supply, and the voltage range detection circuit is connected with a second power supply, wherein:
the voltage range detection circuit is used for generating a voltage detection signal based on the output voltage of the second power supply, and enabling the charging circuit to charge the load based on the second power supply and the voltage range detection circuit under the condition that the output voltage of the second power supply meets a preset range;
the boost charging circuit is used for enabling the charging circuit to charge the load based on the first power supply and the boost charging circuit under the condition that the output voltage of the second power supply does not meet the preset range.
According to the charging circuit provided by the utility model, the charging circuit further comprises an enabling determining circuit, wherein the input end of the enabling determining circuit is connected with the output end of the voltage range detecting circuit, and the output end of the enabling determining circuit is connected with the enabling end of the boosting charging circuit;
the enabling determination circuit is used for generating an enabling signal of the boost charging circuit based on the voltage detection signal, turning off the boost charging circuit and enabling the charging circuit to charge the load based on the second power supply and the voltage range detection circuit when the enabling signal is valid, and turning on the boost charging circuit and enabling the charging circuit to charge the load based on the first power supply and the boost charging circuit when the enabling signal is invalid.
According to the charging circuit provided by the utility model, the enabling determining circuit comprises: resistor R9, resistor R10, resistor R11, capacitor C5 and triode Q4, wherein:
one end of the resistor R9 is used as an input end of the enabling determination circuit, the other end of the resistor R9 is connected with one end of the resistor R10, one end of the capacitor C5 and a base electrode of the triode Q4, the other end of the resistor R10, the other end of the capacitor C5 and an emitting electrode of the triode Q4 are grounded, a collecting electrode of the triode Q4 is connected with one end of the resistor R11, a collecting electrode of the triode Q4 is used as an output end of the enabling determination circuit, and the other end of the resistor R11 is connected with a power supply end.
According to the charging circuit provided by the utility model, the voltage range detection circuit comprises a voltage lower limit detection circuit and a voltage upper limit detection circuit, wherein the input end of the voltage lower limit detection circuit is used as the input end of the voltage range detection circuit, the output end of the voltage lower limit detection circuit is connected with the input end of the voltage upper limit detection circuit, and the output end of the voltage upper limit detection circuit is connected with the charging interface and the input end of the enabling determination circuit.
According to the charging circuit provided by the utility model, the lower voltage limit detection circuit comprises a resistor R1, a resistor R2, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a triode Q1 and a MOS tube Q2, wherein:
one end of the resistor R1 is connected with one end of the resistor R5, one end of the capacitor C2 and the source electrode of the MOS tube Q2, one end of the resistor R1 is used as the input end of the voltage lower limit detection circuit, the other end of the resistor R1 is connected with one end of the resistor R2, one end of the capacitor C1 and the base electrode of the triode Q1, the other end of the resistor R2, the other end of the capacitor C1 and the emitter electrode of the triode Q1 are grounded, the collector electrode of the triode Q1 is connected with the other end of the resistor R5, the other end of the capacitor C2 and one end of the resistor R6, the other end of the resistor R6 is connected with the grid electrode of the MOS tube Q2, and the drain electrode of the MOS tube Q2 is used as the output end of the voltage lower limit detection circuit.
According to the charging circuit provided by the utility model, the upper voltage limit detection circuit comprises a resistor R3, a resistor R4, a resistor R7, a resistor R8, a capacitor C3, a capacitor C4, a MOS tube Q3 and a diode D1, wherein:
one end of the resistor R3 is connected with one end of the resistor R7, one end of the capacitor C4 and a source electrode of the MOS tube Q3, one end of the resistor R3 is used as an input end of the upper voltage limit detection circuit, the other end of the resistor R3 is connected with the other end of the resistor R7, one end of the resistor R8, one end of the resistor R4 and one end of the capacitor C3, the other end of the resistor R4 and the other end of the capacitor C3 are grounded, the other end of the resistor R8 is connected with the other end of the capacitor C4 and a grid electrode of the MOS tube Q3, a drain electrode of the MOS tube Q3 is connected with an anode of the diode D1, and a cathode of the diode D1 is used as an output end of the upper voltage limit detection circuit.
According to the charging circuit provided by the utility model, the boosting charging circuit comprises a boosting sub-circuit, and the enabling end of the boosting sub-circuit is used as the enabling end of the boosting charging circuit.
According to the charging circuit provided by the utility model, the boosting charging circuit further comprises a first filter circuit and a second filter circuit, and the first filter circuit, the boosting sub-circuit and the second filter circuit are sequentially connected in series.
The utility model also provides video monitoring equipment which comprises a shell, a first power supply and the charging circuit, wherein the first power supply and the charging circuit are arranged in the shell, and the charging circuit is respectively connected with a second power supply and the first power supply.
The video monitoring equipment provided by the utility model further comprises a charging interface, wherein the charging interface comprises a first charging sub-interface and a second charging sub-interface, the input end of the voltage range detection circuit in the charging circuit is connected with the second power supply through the second charging sub-interface, the output ends of the voltage range detection circuit and the boosting charging circuit in the charging circuit are both connected with the first charging sub-interface, and the input end of the voltage range detection circuit in the charging circuit is connected with a load through the first charging sub-interface.
According to the charging circuit and the video monitoring equipment, the output voltage of the second power supply is detected through the voltage range detection circuit, and under the condition that the output voltage of the second power supply does not meet the preset range, the load is charged through the first power supply and the boosting charging circuit; under the condition that the output voltage of the second power supply meets the preset range, the second power supply and the voltage range detection circuit charge the load, the second power supply replaces the first power supply, the electric quantity of the first power supply is saved, and the load duration of the first power supply is prolonged.
Drawings
In order to more clearly illustrate the utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a charging circuit according to the present utility model;
FIG. 2 is a second schematic diagram of the connection of the charging circuit according to the present utility model;
FIG. 3 is a schematic circuit diagram of an enable determination circuit provided by the present utility model;
FIG. 4 is a schematic circuit diagram of a voltage range detection circuit provided by the present utility model;
FIG. 5 is a schematic circuit diagram of a boost charging circuit provided by the present utility model;
FIG. 6 is a schematic diagram of a connection of a video monitoring device according to the present utility model;
fig. 7 is a second connection schematic diagram of the video monitoring device provided by the present utility model.
Reference numerals:
100: a charging circuit; 110: a voltage range detection circuit; 111: a voltage lower limit detection circuit; 112: a voltage upper limit detection circuit; 120: a boost charging circuit; 121: a boosting sub-circuit; 122: a first filter circuit; 123: a second filter circuit; 130: an enable determination circuit; 200: a housing; 300: a first power supply; 400: a second power supply; 500: a charging interface; 510: a first charging sub-interface; 520: a second charging sub-interface; 600: and (3) loading.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In order to solve the problem of shorter load duration when boost power is supplied by using a lithium battery in the prior art, an embodiment of the present utility model provides a charging circuit, fig. 1 is one of connection schematic diagrams of the charging circuit provided by the present utility model, as shown in fig. 1, the charging circuit 100 includes a voltage range detection circuit 110 and a boost charging circuit 120 connected in series, the boost charging circuit 120 and the voltage range detection circuit 110 are both connected to a load 600, the boost charging circuit 120 is connected to a first power supply 300, the voltage range detection circuit 110 is connected to a second power supply 400, wherein:
the voltage range detection circuit 110 is configured to generate a voltage detection signal based on the output voltage of the second power supply 400, and cause the charging circuit to charge the load 600 based on the second power supply 400 and the voltage range detection circuit 110 when the output voltage of the second power supply 400 satisfies a preset range;
the boost charging circuit 120 is configured to charge the load 600 based on the first power supply 300 and the boost charging circuit 120, in a case where the output voltage of the second power supply 400 does not satisfy a preset range.
Specifically, in the prior art, the output voltage of the lithium battery is generally boosted to 12V by the boost charging circuit 120 to charge the load 600 connected to the 12V output voltage port, and the load duration is shorter when the load 600 carried by the 12V output voltage port is larger due to the limited battery capacity of the lithium battery. Therefore, in the embodiment of the present utility model, the output voltage of the second power supply 400 is detected by the voltage range detection circuit 110, if the output voltage of the second power supply 400 is within the preset range, the boost charging circuit 120 is turned off, and the load 600 is charged by the output terminal of the voltage range detection circuit 110, and when the output voltage of the second power supply 400 is within the preset range, the input terminal voltage and the output terminal voltage of the voltage range detection circuit 110 are equal and are both within the preset range. If the output voltage of the second power supply 400 is not within the preset range, the boost charging circuit 120 is turned on, and the output voltage of the first power supply 300 is boosted to 12V by the boost charging circuit 120, and the load 600 connected to the 12V output voltage port is charged. By setting the preset range, the input voltages in different ranges charge the load 600 by using different circuits and power supplies, thereby saving the electric quantity of the first power supply 300 and increasing the load duration.
Alternatively, the first power supply 300 may be a lithium battery built in the video monitoring device or an external charger, etc., and the output voltage of the first power supply 300 may be boosted to a preset voltage value by the boost charging circuit 120, where the preset voltage value may be 12V. The second power supply 400 may be a dc power supply, and the voltage range detection circuit 110 may be directly connected to the second power supply 400 or connected to the second power supply 400 through a power adapter.
Optionally, fig. 2 is a second schematic connection diagram of the charging circuit provided by the present utility model, as shown in fig. 2, the charging circuit 100 further includes an enable determination circuit 130, an input end of the enable determination circuit 130 is connected to an output end of the voltage range detection circuit 110, and an output end of the enable determination circuit 130 is connected to an enable end of the boost charging circuit 120;
the enable determination circuit 130 is configured to generate an enable signal of the boost charging circuit 120 based on the voltage detection signal, turn off the boost charging circuit 120 and charge the load 600 by the charging circuit 100 based on the second power supply 400 and the voltage range detection circuit 110 when the enable signal is valid, and turn on the boost charging circuit 120 and charge the load 600 by the charging circuit 100 based on the first power supply 300 and the boost charging circuit 120 when the enable signal is invalid.
Specifically, when the voltage range detection circuit 110 detects that the output voltage of the second power supply 400 is within the preset range, a valid enable signal is generated, where the enable signal is valid at a low level, that is, the generated enable signal is a low level signal, and the enable signal turns off the boost charging circuit 120 through the enable terminal of the boost charging circuit 120, and charges the load 600 through the output terminal of the voltage range detection circuit 110. When the voltage range detection circuit 110 detects that the output voltage of the second power supply 400 is not within the preset range, that is, the output voltage of the second power supply 400 is smaller than the lower limit value of the preset range, or the output voltage of the second power supply 400 is larger than the upper limit value of the preset range, an invalid enable signal is generated, that is, the generated enable signal is a high level signal, the enable signal turns on the boost charging circuit 120 through the enable end of the boost charging circuit 120, and the output voltage of the first power supply 300 is boosted to 12V through the boost charging circuit 120, and charges the load 600 connected to the 12V output voltage port.
Optionally, fig. 3 is a circuit schematic diagram of an enable determining circuit provided in the present utility model, as shown in fig. 3, the enable determining circuit 130 includes: resistor R9, resistor R10, resistor R11, capacitor C5 and triode Q4, wherein:
one end of the resistor R9 is used as an input end of the enabling determination circuit 130, the other end of the resistor R9 is connected with one end of the resistor R10, one end of the capacitor C5 and a base electrode of the triode Q4, the other end of the resistor R10, the other end of the capacitor C5 and an emitter electrode of the triode Q4 are grounded, a collector electrode of the triode Q4 is connected with one end of the resistor R11, a collector electrode of the triode Q4 is used as an output end of the enabling determination circuit 130, and the other end of the resistor R11 is connected with a power supply end VDD3V3.
Specifically, when the voltage range detection circuit 110 detects that the output voltage of the second power supply 400 is within the preset range, the input end of the enable determination circuit 130 is a high level signal, and is within the preset range, the transistor Q4 is turned on due to the voltage dividing capability of the resistor R9 and the resistor R10, so that the output end EN of the enable determination circuit 130 is pulled down, the output end EN is connected to the enable end of the boost charging circuit 120, and after the output end EN of the enable determination circuit 130 is pulled down, the enable end of the boost charging circuit 120 is pulled down, so that the enable end of the boost charging circuit 120 is disabled, and the boost charging circuit 120 is turned off. At this time, the second power supply 400 replaces the first power supply 300 as a power supply, and charges the load 600 through the output terminal of the voltage range detection circuit 110, so as to save the electric quantity of the first power supply 300 and increase the load duration.
When the voltage range detection circuit 110 detects that the output voltage of the second power supply 400 is not within the preset range, the input end of the enable determination circuit 130 is a low level signal, the triode Q4 is turned off, and then, the output end EN of the enable determination circuit 130 is pulled up through the power supply end VDD3V3, the output end EN is connected to the enable end of the boost charging circuit 120, and after the output end EN of the enable determination circuit 130 is pulled up, the enable end of the boost charging circuit 120 is pulled up, so that the enable end of the boost charging circuit 120 is enabled, and then, the boost charging circuit 120 is turned on. At this time, the load 600 may be charged through the output terminal of the boost charging circuit 120 using the first power supply 300 as a power supply.
Optionally, the voltage dividing capability of the resistor R9 and the resistor R10 may be determined by setting the resistance values of the resistor R9 and the resistor R10, so as to ensure that when the voltage of the input end of the enable determination circuit 130 is within a preset range, the voltage of the base electrode of the triode Q4 is smaller than the voltage of the collector electrode of the triode Q4 through the voltage division of the resistor R9 and the resistor R10, and further enable the triode Q4 to be turned on.
Optionally, fig. 4 is a circuit schematic diagram of a voltage range detection circuit provided by the present utility model, as shown in fig. 4, the voltage range detection circuit 110 includes a voltage lower limit detection circuit 111 and a voltage upper limit detection circuit 112, an input end of the voltage lower limit detection circuit 111 is used as an input end of the voltage range detection circuit 110, an output end of the voltage lower limit detection circuit 111 is connected to an input end of the voltage upper limit detection circuit 112, and an output end of the voltage upper limit detection circuit 112 is connected to a charging interface 500 and an input end of the enable determination circuit 130.
Optionally, as shown in fig. 4, the voltage lower limit detection circuit 111 includes a resistor R1, a resistor R2, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a triode Q1, and a MOS transistor Q2, where:
one end of the resistor R1 is connected with one end of the resistor R5, one end of the capacitor C2 and the source electrode of the MOS transistor Q2, one end of the resistor R1 is used as the input end of the voltage lower limit detection circuit 111, the other end of the resistor R1 is connected with one end of the resistor R2, one end of the capacitor C1 and the base electrode of the triode Q1, the other end of the resistor R2, the other end of the capacitor C1 and the emitter electrode of the triode Q1 are grounded, the collector electrode of the triode Q1 is connected with the other end of the resistor R5, the other end of the capacitor C2 and one end of the resistor R6, the other end of the resistor R6 is connected with the gate electrode of the MOS transistor Q2, and the drain electrode of the MOS transistor Q2 is used as the output end of the voltage lower limit detection circuit 111.
Optionally, as shown in fig. 4, the voltage upper limit detection circuit 112 includes a resistor R3, a resistor R4, a resistor R7, a resistor R8, a capacitor C3, a capacitor C4, a MOS transistor Q3, and a diode D1, where:
one end of the resistor R3 is connected with one end of the resistor R7, one end of the capacitor C4 and the source electrode of the MOS transistor Q3, one end of the resistor R3 is used as the input end of the upper voltage limit detection circuit 112, the other end of the resistor R3 is connected with the other end of the resistor R7, one end of the resistor R8, one end of the resistor R4 and one end of the capacitor C3, the other end of the resistor R4 and the other end of the capacitor C3 are grounded, the other end of the resistor R8 is connected with the other end of the capacitor C4 and the gate electrode of the MOS transistor Q3, the drain electrode of the MOS transistor Q3 is connected with the anode of the diode D1, and the cathode of the diode D1 is used as the output end of the upper voltage limit detection circuit 112.
Specifically, the second power supply 400 is connected to the input terminal VDD12V1 of the voltage lower limit detection circuit 111, the lower limit value of the preset range is set through the resistor R1 and the resistor R2, and the conduction condition of the triode Q1 is controlled through the voltage dividing capability of the resistor R1 and the resistor R2, so as to control the conduction condition of the MOS transistor Q2. For example, taking the lower limit value of the preset range set by the resistor R1 and the resistor R2 as 9V as an example, if the output voltage of the second power supply 400 is greater than or equal to 9V, the triode Q1 is turned on, and then the voltage of the base electrode of the MOS transistor Q2 is pulled down, so that the MOS transistor Q2 is turned on, and the input voltage of the voltage lower limit detection circuit 111 is equal to the output voltage. If the output voltage of the second power supply 400 is less than 9V, the transistor Q1 is turned off, and the voltage of the base electrode of the MOS transistor Q2 is further raised, so that the MOS transistor Q2 is turned off, and the output voltage of the voltage lower limit detection circuit 111 is 0V.
The input end of the voltage upper limit detection circuit 112 is connected with the output end of the voltage lower limit detection circuit 111, the upper limit value of the preset range is set through a resistor R3 and a resistor R4, and the conduction condition of the MOS tube Q3 is controlled through the voltage dividing capability of the resistor R3 and the resistor R4.
By way of example, taking the resistor R3 and the resistor R4 as the upper limit value of the preset range set to 16V, the turn-on condition of the voltage range detection circuit 110 is shown in table 1, wherein:
when the output voltage of the voltage lower limit detection circuit 111 is greater than or equal to 9V and less than or equal to 16V, the voltage of the base electrode of the MOS transistor Q3 is pulled down due to the voltage division between the resistor R3 and the resistor R4, so that the MOS transistor Q3 is turned on, and the voltage drops on the MOS transistor Q2, the MOS transistor Q3 and the diode D1 are small and negligible, so that the output voltage of the voltage upper limit detection circuit 112 is equal to the input voltage, and thus the output voltage of the voltage range detection circuit 110 is equal to the input voltage.
When the output voltage of the voltage lower limit detection circuit 111 is greater than or equal to 9V and greater than 16V, the voltage of the base electrode of the MOS transistor Q3 is pulled up, so that the MOS transistor Q3 is turned off, the output voltage of the voltage upper limit detection circuit 112 is also 0V, and the output voltage of the whole voltage range detection circuit 110 is 0V.
When the output voltage of the voltage lower limit detection circuit 111 is equal to 0V, that is, when the input voltage of the voltage lower limit detection circuit 111 is less than 9V, the voltage of the base electrode of the MOS transistor Q3 is pulled up, so that the MOS transistor Q3 is turned off, the output voltage of the voltage upper limit detection circuit 112 is also 0V, and the output voltage of the whole voltage range detection circuit 110 is 0V.
Table 1 conduction conditions of the voltage range detection circuit 110
| Input voltage | MOS tube Q2 | MOS tube Q3 | Output voltage |
| 8V | Cut-off | Cut-off | 0V |
| 10V | Conduction | Conduction | 10V |
| 16V | Conduction | Conduction | 16V |
| 18V | Conduction | Cut-off | 0V |
Optionally, fig. 5 is a schematic circuit diagram of a boost charging circuit provided by the present utility model, as shown in fig. 5, the boost charging circuit 120 includes a boost sub-circuit 121, and an enable terminal of the boost sub-circuit 121 is used as an enable terminal of the boost charging circuit 120.
Optionally, as shown in fig. 5, the boost charging circuit 120 further includes a first filter circuit 122 and a second filter circuit 123, where the first filter circuit 122, the boost sub-circuit 121, and the second filter circuit 123 are sequentially connected in series.
Specifically, the boost sub-circuit 121 in the boost charging circuit 120 may employ a boost chip SY7120, where the boost chip SY7120 is a boost converter for performing stable boost conversion on the voltage at the input terminal and providing the boosted voltage to the output terminal. The type of the boost chip used by the boost sub-circuit 121 is not limited in the embodiment of the present utility model, and the boost chip capable of implementing the boost capability may be used. In addition, the input end of the boost sub-circuit 121 is connected with the first filter circuit 122, the output end of the boost sub-circuit 121 is connected with the second filter circuit 123, and each of the first filter circuit 122 and the second filter circuit 123 comprises 4 capacitors connected in parallel. The first filter circuit 122 includes a capacitor C6-capacitor C9 connected in parallel, and the first filter circuit 122 is used for filtering noise of the input voltage, reducing electromagnetic interference in the circuit, and ensuring stability of the input voltage by filtering and stabilizing the input voltage. The second filter circuit 123 includes a capacitor C13-capacitor C16 connected in parallel, and the second filter circuit 123 is configured to filter noise of the output voltage, ensure that ripple of the output voltage is as small as possible, and provide a stable output voltage.
In the charging circuit provided by the embodiment of the utility model, the output voltage of the second power supply 400 is detected by the voltage range detection circuit 110, and the load 600 is charged by the first power supply 300 and the boost charging circuit 120 when the output voltage of the second power supply 400 does not meet the preset range; in the case that the output voltage of the second power supply 400 satisfies the preset range, the second power supply 400 and the voltage range detection circuit 110 charge the load 600, and the second power supply 400 replaces the first power supply 300, so that the electric quantity of the first power supply 300 is saved, and the load duration of the first power supply 300 is increased.
The embodiment of the present utility model further provides a video monitoring device, and fig. 6 is one of connection schematic diagrams of the video monitoring device provided by the present utility model, as shown in fig. 6, the video monitoring device includes a housing 200, a first power supply 300, and a charging circuit 100 as set forth in any one of the foregoing, where the first power supply 300 and the charging circuit 100 are both disposed in the housing 200, and the charging circuit 100 is respectively connected to a second power supply 400 and the first power supply 300.
Optionally, fig. 7 is a second connection schematic diagram of the video monitoring device provided by the present utility model, as shown in fig. 7, the video monitoring device further includes a charging interface 500, where the charging interface 500 includes a first charging sub-interface 510 and a second charging sub-interface 520, an input end of the voltage range detection circuit 110 in the charging circuit 100 is connected to the second power supply 400 through the second charging sub-interface 520, and output ends of the voltage range detection circuit 110 and the boost charging circuit 120 in the charging circuit 100 are both connected to the first charging sub-interface 510, and are connected to the load 600 through the first charging sub-interface 510.
Specifically, the voltage range detection circuit 110 in the charging circuit 100 detects whether the output voltage of the externally-connected second power supply 400 meets the preset range through the second charging sub-interface 520, and if the output voltage of the second power supply 400 is within the preset range, the enabling determination circuit 130 in the charging circuit 100 generates an effective enabling signal, so as to turn off the boost charging circuit 120, and the voltage range detection circuit 110 is connected to the first charging sub-interface 510, and the second power supply 400 is used as a power supply to charge the load 600. If the output voltage of the second power supply 400 is not within the preset range, the enable determination circuit 130 in the charging circuit 100 generates an invalid enable signal, so as to turn on the boost charging circuit 120, and the boost charging circuit 120 is connected to the first charging sub-interface 510, and the first power supply 300 is used as a power supply, and the load 600 is charged after the output voltage of the first power supply 300 is boosted by the boost charging circuit 120.
It should be noted that the video monitoring device may be an engineering treasure product, and is used for checking or debugging the working state of the network camera. The first charging sub-interface 510 may be a 12V output voltage port, and the second charging sub-interface 520 may be a DC12V input detection voltage port.
The video monitoring device provided by the utility model detects the output voltage of the second power supply 400 through the voltage range detection circuit 110 in the charging circuit 100, and charges the load 600 through the first power supply 300 and the boost charging circuit 120 when the output voltage of the second power supply 400 does not meet the preset range; in the case that the output voltage of the second power supply 400 satisfies the preset range, the second power supply 400 and the voltage range detection circuit 110 charge the load 600, and the second power supply 400 replaces the first power supply 300, so that the electric quantity of the first power supply 300 is saved, and the load duration of the first power supply 300 is increased.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will 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 utility model.
Claims (10)
1. The utility model provides a charging circuit, its characterized in that includes series connection's voltage range detection circuit and boost charging circuit, boost charging circuit with voltage range detection circuit all connects the load, just boost charging circuit connects first power, voltage range detection circuit connects the second power, wherein:
the voltage range detection circuit is used for generating a voltage detection signal based on the output voltage of the second power supply, and enabling the charging circuit to charge the load based on the second power supply and the voltage range detection circuit under the condition that the output voltage of the second power supply meets a preset range;
the boost charging circuit is used for enabling the charging circuit to charge the load based on the first power supply and the boost charging circuit under the condition that the output voltage of the second power supply does not meet the preset range.
2. The charging circuit of claim 1, further comprising an enable determination circuit having an input coupled to an output of the voltage range detection circuit, the output of the enable determination circuit being coupled to an enable of the boost charging circuit;
the enabling determination circuit is used for generating an enabling signal of the boost charging circuit based on the voltage detection signal, turning off the boost charging circuit and enabling the charging circuit to charge the load based on the second power supply and the voltage range detection circuit when the enabling signal is valid, and turning on the boost charging circuit and enabling the charging circuit to charge the load based on the first power supply and the boost charging circuit when the enabling signal is invalid.
3. The charging circuit of claim 2, wherein the enable determination circuit comprises: resistor R9, resistor R10, resistor R11, capacitor C5 and triode Q4, wherein:
one end of the resistor R9 is used as an input end of the enabling determination circuit, the other end of the resistor R9 is connected with one end of the resistor R10, one end of the capacitor C5 and a base electrode of the triode Q4, the other end of the resistor R10, the other end of the capacitor C5 and an emitting electrode of the triode Q4 are grounded, a collecting electrode of the triode Q4 is connected with one end of the resistor R11, a collecting electrode of the triode Q4 is used as an output end of the enabling determination circuit, and the other end of the resistor R11 is connected with a power supply end.
4. A charging circuit according to claim 2 or 3, wherein the voltage range detection circuit comprises a lower voltage limit detection circuit and an upper voltage limit detection circuit, the input of the lower voltage limit detection circuit being the input of the voltage range detection circuit, the output of the lower voltage limit detection circuit being connected to the input of the upper voltage limit detection circuit, the output of the upper voltage limit detection circuit being connected to the charging interface and the input of the enable determination circuit.
5. The charging circuit of claim 4, wherein the lower voltage limit detection circuit comprises a resistor R1, a resistor R2, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a transistor Q1, and a MOS transistor Q2, wherein:
one end of the resistor R1 is connected with one end of the resistor R5, one end of the capacitor C2 and the source electrode of the MOS tube Q2, one end of the resistor R1 is used as the input end of the voltage lower limit detection circuit, the other end of the resistor R1 is connected with one end of the resistor R2, one end of the capacitor C1 and the base electrode of the triode Q1, the other end of the resistor R2, the other end of the capacitor C1 and the emitter electrode of the triode Q1 are grounded, the collector electrode of the triode Q1 is connected with the other end of the resistor R5, the other end of the capacitor C2 and one end of the resistor R6, the other end of the resistor R6 is connected with the grid electrode of the MOS tube Q2, and the drain electrode of the MOS tube Q2 is used as the output end of the voltage lower limit detection circuit.
6. The charging circuit of claim 4, wherein the upper voltage limit detection circuit comprises a resistor R3, a resistor R4, a resistor R7, a resistor R8, a capacitor C3, a capacitor C4, a MOS transistor Q3, and a diode D1, wherein:
one end of the resistor R3 is connected with one end of the resistor R7, one end of the capacitor C4 and a source electrode of the MOS tube Q3, one end of the resistor R3 is used as an input end of the upper voltage limit detection circuit, the other end of the resistor R3 is connected with the other end of the resistor R7, one end of the resistor R8, one end of the resistor R4 and one end of the capacitor C3, the other end of the resistor R4 and the other end of the capacitor C3 are grounded, the other end of the resistor R8 is connected with the other end of the capacitor C4 and a grid electrode of the MOS tube Q3, a drain electrode of the MOS tube Q3 is connected with an anode of the diode D1, and a cathode of the diode D1 is used as an output end of the upper voltage limit detection circuit.
7. A charging circuit according to any one of claims 1 to 3, wherein the boost charging circuit comprises a boost sub-circuit having an enable terminal as an enable terminal of the boost charging circuit.
8. The charging circuit of claim 7, wherein the boost charging circuit further comprises a first filter circuit and a second filter circuit, the first filter circuit, the boost sub-circuit, and the second filter circuit being connected in series in sequence.
9. A video monitoring device, comprising a housing, a first power source, and a charging circuit according to any one of claims 1-8, wherein the first power source and the charging circuit are both disposed in the housing, and the charging circuit is connected to a second power source and the first power source, respectively.
10. The video monitoring device of claim 9, further comprising a charging interface, the charging interface comprising a first charging sub-interface and a second charging sub-interface, wherein an input of the voltage range detection circuit in the charging circuit is connected to the second power supply through the second charging sub-interface, and an output of the voltage range detection circuit and the boost charging circuit in the charging circuit are both connected to the first charging sub-interface and connected to a load through the first charging sub-interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321943355.5U CN220440401U (en) | 2023-07-21 | 2023-07-21 | Charging circuit and video monitoring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321943355.5U CN220440401U (en) | 2023-07-21 | 2023-07-21 | Charging circuit and video monitoring equipment |
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| Publication Number | Publication Date |
|---|---|
| CN220440401U true CN220440401U (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321943355.5U Active CN220440401U (en) | 2023-07-21 | 2023-07-21 | Charging circuit and video monitoring equipment |
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| Country | Link |
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| CN (1) | CN220440401U (en) |
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2023
- 2023-07-21 CN CN202321943355.5U patent/CN220440401U/en active Active
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