CN218974478U - Load detection circuit, power supply equipment and electronic device - Google Patents
Load detection circuit, power supply equipment and electronic device Download PDFInfo
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- CN218974478U CN218974478U CN202222766537.1U CN202222766537U CN218974478U CN 218974478 U CN218974478 U CN 218974478U CN 202222766537 U CN202222766537 U CN 202222766537U CN 218974478 U CN218974478 U CN 218974478U
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Abstract
The application provides a load detection circuit, power supply unit and electron device, load detection circuit includes: the control unit is used for determining the resistance value of the load in the detection loop according to the sampled electric signal, controlling and outputting a first conduction signal to the switch unit when the resistance value of the load is larger than a preset resistance value, and outputting a disconnection signal to the detection unit, so that the switch unit conducts the connection between the power supply circuit and the load, supplies power to the load by using the power supply circuit, and can disconnect the detection loop between the detection unit and the load. The load resistance value connected to the power supply circuit can be accurately detected, and the electric energy output of the power supply circuit is controlled through the resistance value, so that misjudgment of the power supply circuit on load connection is avoided.
Description
Technical Field
The application relates to the technical field of power supply, in particular to a load detection circuit, power supply equipment and an electronic device.
Background
In the related art, the power supply device may determine whether there is a load connected by detecting the output power of the power supply device, and when there is a load connected, the power supply device may control the output of electric energy to supply power to the load.
However, when the connected load is a low-power load or the load is in an electricity protection state and the receiving power is reduced, the output power of the power supply equipment is small, the power supply equipment is easy to misjudge, and the power supply equipment is considered to have no connection of the load, so that the output of electric energy is stopped, the connected load cannot work normally, and the normal use of the load is affected.
Disclosure of Invention
In view of this, the application provides a load detection circuit, power supply unit and electron device, and this load detection circuit can solve the misjudgement that power supply unit inserts the load, leads to the unable normal problem that carries out work of load that inserts.
A load detection circuit for detecting whether a load is connected in a power supply circuit; the load detection circuit includes:
the switching unit is connected to the load side of the power supply circuit and used for conducting connection between the power supply circuit and the load when receiving a first conducting signal so as to enable the power supply circuit to supply power to the load;
the detection unit is connected with the output end of the switch unit and is used for forming a detection loop with a load; the detection unit is used for conducting the detection loop when receiving a second conducting signal;
the sampling unit is used for detecting the electric parameters in the detection loop so as to output a sampling electric signal;
the control unit is respectively connected with the switch unit, the detection unit and the sampling unit; the control unit is used for determining a load resistance value in the detection loop according to the sampling electric signal, outputting the first conduction signal when the load resistance value is larger than a preset resistance value, and outputting a disconnection signal to the detection unit;
the detection unit is also used for disconnecting the detection loop when the disconnection signal is received.
In one embodiment, the detection unit includes a second switch, a first power supply, and a first resistor;
the second switch, the first power supply and the first resistor are all connected in series in the detection loop; the second switch is used for being conducted when the second conduction signal is received so as to conduct the detection loop, and is used for being disconnected when the disconnection signal is received so as to disconnect the detection loop.
In one embodiment, the sampling unit includes a current sampling element, the current sampling element is connected in series in the detection loop, and the current sampling element is used for sampling the current in the detection loop so as to output a current sampling electric signal; the control unit is used for determining a load resistance value in the detection loop according to the current sampling electric signal, the resistance value of the first resistor and the power supply voltage of the first power supply.
In one embodiment, the sampling unit further includes a voltage sampling element and a current sampling element, the voltage sampling element is connected in parallel to two ends of the first power supply, and the voltage sampling element is used for sampling the voltage in the detection loop so as to output a voltage sampling electric signal; the current sampling element is connected in series in the detection loop and is used for sampling the current in the detection loop so as to output a current sampling electric signal;
the control unit is used for determining a load resistance value in the detection loop according to the current sampling electric signal, the resistance value of the first resistor and the voltage sampling electric signal.
In one embodiment, the detection unit further includes an adjustable resistor connected in series in the detection loop, the adjustable resistor being configured to divide the voltage of the load.
In one embodiment, the switching unit includes a first switch, a first end of the first switch is connected to a load side of the power supply circuit, a second end of the first switch is connected to the load, and a control end of the first switch is connected to the control unit.
In one embodiment, the load detection circuit further comprises a consumer unit connected in parallel with the detection unit.
A second aspect of the present application provides a power supply apparatus comprising a power supply circuit and a load detection circuit as described above.
According to one possible embodiment of the present application, the power supply circuit includes a battery unit and a voltage conversion unit, the voltage conversion unit is connected to the battery unit, and an output terminal of the voltage conversion unit is used as a load side of the power supply circuit; the voltage conversion unit is used for converting the power supply of the battery unit into a target electric signal and outputting the target electric signal through the load side of the power supply circuit.
A third aspect of the present application provides an electronic device, including the power supply apparatus described above.
The beneficial effects that this application provided technical scheme brought include at least:
in one or more embodiments of the present application, a load detection circuit is provided to detect whether a load is connected in a power supply circuit. The load detection circuit comprises a switch unit, a detection unit, a sampling unit and a control unit; the utility model provides a be connected through detecting element and the output of switch element for form the detection loop with the load, detect the electrical parameter in the detection loop through sampling unit, with the output sampling signal, control unit is arranged in confirming the load resistance value in the detection loop according to the sampling signal, control output first switch-on signal to switch element when the load resistance value is greater than preset resistance value, and output disconnect signal to detecting element, make switch element switch on the connection of power supply unit and load, utilize power supply circuit to supply power to the load, and can break off the detection loop. According to the scheme, the load resistance value of the power supply circuit can be accurately detected, whether a load is connected currently or not is determined according to the load resistance value, so that the switch unit is controlled to be conducted when the load is connected, the power supply circuit outputs electric energy to the load, and the problem that the power supply circuit stops outputting the electric energy when misjudging the load is connected in the related technology, and the connected load cannot work normally is solved.
Drawings
Fig. 1 is an application scenario diagram of a power supply device for supplying power to a load according to an embodiment of the present application.
Fig. 2 is a schematic block diagram of a load detection circuit according to an embodiment of the present application.
Fig. 3 is a circuit configuration diagram of a load detection circuit according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a power supply device according to an embodiment of the present application.
Detailed Description
It should be noted that the terms "first" and "second" in the specification, claims and drawings of this application are used for distinguishing between similar objects and not for describing a particular sequential or chronological order.
It should be further noted that the method disclosed in the embodiments of the present application or the method shown in the flowchart, including one or more steps for implementing the method, may be performed in an order that the steps may be interchanged with one another, and some steps may be deleted without departing from the scope of the claims.
Fig. 1 is an application scenario diagram of a power supply device for supplying power to a load according to an embodiment of the present application. As shown in fig. 1, the power supply apparatus 10 may be connected to a charging interface of the load 20 through a charging cable to output a power supply voltage and/or a power supply current satisfying power demand thereof to the load 20 to supply power to the load 20. The power supply device 10 may include an ac power supply device and a dc power supply device, where the ac power supply device may include an adapter connected to a mains supply, an alternator, a mobile energy storage device, and other devices that provide ac power. The direct current device may include, but is not limited to, a mobile energy storage device, a solar energy input device, etc. that provides direct current. The load 20 includes an electronic device 20 that needs to perform electric energy input, and the electronic device 20 includes, but is not limited to, a mobile phone, a tablet computer, a wearable device, a notebook computer, a PC (Personal Computer, a personal computer), a household appliance, etc., and the product forms of the load 20 and the power supply device 10 are not specifically limited in this embodiment.
In the related art, the power supply apparatus 10 calculates its own output power by detecting its own output current and/or output voltage, thereby judging the condition of the load 20 being connected. When the power supply device 10 detects that its own output power is small, the MCU (MCU, microcontroller Unit, micro control unit) of the power supply device directly determines that no load 20 is connected, and controls the switch on the power supply circuit to be opened, so as to stop outputting the current and/or voltage. The switch is arranged on a power supply loop of the power supply equipment 10 and is used for controlling the on-off of the power supply loop. As can be understood from the foregoing, the power supply apparatus 10 in the related art first controls the on-off state after detecting that the load 20 is connected, so as to turn on the power supply loop, and output the power to the load 20, but determines that the load 20 is not connected in the power supply loop when detecting that the power output by the power is less than the preset power value, so as to control the switch to turn off, disconnect the power supply loop, and stop outputting the power. Therefore, when the low-power load 20 is connected to the power supply device 10, or when the load is in a low-power working state, the power supply device 10 may misjudge that the load does not exist due to the excessively low detected power value, so as to control the switch to be turned off, and power supply to the load is stopped, that is, the condition that the power supply device 10 suddenly stops outputting electric energy during power supply can occur, so that the connected load 20 cannot work normally, and normal use of the load 20 is affected.
For example, when the power supply device 10 is an energy storage device of the related art, after a user manually turns on an electric energy output switch of the energy storage device, or after the MCU of the energy storage device detects that the load 20 is connected to the power output switch, if the output power of the energy storage device is smaller than the set power, for example, when the set power is 5W, when the required power of the load is 1W, that is, when the output power of the energy storage device is 1W, the MCU of the energy storage device may be mistakenly connected to the load, so that the MCU of the energy storage device may automatically turn off the electric energy output switch, which may cause that the low-power load 20 cannot be charged normally, or may not maintain the requirement of the working electric energy of the low-power load 20, and the low-power load 20 cannot work normally.
Next, a load detection circuit according to an embodiment of the present application will be described with reference to fig. 1, where the load detection circuit may be disposed in the power supply apparatus 10 described above, and is configured to detect whether a load 20 is connected to the power supply circuit. The load detection circuit may be provided independently and connected to the power supply apparatus 10. As shown in fig. 2, fig. 2 is a schematic block diagram of a load detection circuit according to an embodiment of the present application, and specifically, the load detection circuit 200 includes: a switching unit 210, a detecting unit 220, a sampling unit 230, and a control unit 240.
The switch unit 210 is connected to the load side of the power supply circuit, and the switch unit 210 is configured to turn on the connection between the power supply circuit and the load 20 when receiving the first turn-on signal, so that the power supply circuit supplies power to the load 20. That is, the switching unit 210 can control the output of the power supply circuit 11.
In this embodiment, the output of the power supply circuit 11 includes an AC power output (AC) or a DC power output (DC), that is, the power supply device 10 may be an AC power supply device or a DC power supply device, and may provide AC power or DC power to the accessed load 20, which is not limited herein.
In the present embodiment, the switching unit 210 is connected to the load side of the power supply circuit, that is, the switching unit 210 is connected to the side where the power supply circuit is connected to the load. The output terminal of the switching unit 210 includes, but is not limited to, a Micro USB (Universal Serial Bus ) interface, a USB Type C interface, a Lightning interface, a three-wire power outlet, and the like, which perform power output. The load is connected to the output terminal of the switching unit 210 to enable the power supply circuit in the power supply apparatus 10 to supply power to the load 20 when the switching unit 210 is turned on.
The detection unit 220 is connected to an output end of the switch unit 210, and is used for forming a detection loop with the load 20; the detection unit 220 is configured to turn on the detection loop when receiving the second turn-on signal.
The sampling unit 230 is used for detecting the electrical parameter in the detection loop to output a sampled electrical signal. The electrical parameter may include a current parameter, a voltage parameter, a resistance parameter, or the like in the detection circuit, or may include at least two of the above parameters, which is not limited herein.
The control unit 240 is connected with the switching unit 210, the detecting unit 220 and the sampling unit 230, respectively; the control unit 240 is configured to determine a resistance value of the load 20 in the detection loop according to the sampled electrical signal, output a first on signal when the resistance value of the load 20 is greater than a preset resistance value, and output an off signal to the detection unit 220. The detection unit 220 is further configured to disconnect the detection loop when receiving the disconnection signal.
In this embodiment, the detection unit 220 is connected to the output end of the switch unit 210, so as to form a detection loop with the load 20, the sampling unit 230 is used to detect the electrical parameter in the detection unit 220, so as to output a sampled electrical signal, the control unit 240 is used to determine the resistance value of the load 20 in the detection loop according to the sampled electrical signal, when the resistance value of the load 20 is greater than a preset resistance value, the control unit is used to control and output a first on signal to the switch unit 210, and output an off signal to the detection unit 220, so that the switch unit 210 conducts the connection between the power supply device and the load 20, and the power supply circuit in the power supply device is used to supply power to the load 20, so that the detection loop can be disconnected. That is, the embodiment of the application can detect the resistance value of the load 20 connected to the power supply device, and determine whether the load is connected currently according to the load resistance value of the load 20, so as to control the switch unit to be turned on when the load is connected, and further enable the power supply circuit of the power supply device to output electric energy to the load 20, so that the problem that the power supply circuit misjudges the connection of the load 20 in the related art to stop the electric energy output, and the connected load 20 cannot work normally can be solved.
As shown in fig. 3, fig. 3 is a circuit configuration diagram of a load detection circuit according to an embodiment of the present application. Specifically, the load detection circuit 200 includes a switching unit 210, a detection unit 220, a sampling unit 230, and a control unit 240. The control unit 240 is connected to the switch unit 210, the detection unit 220, and the sampling unit 230, respectively.
The detection unit 220 includes a second switch K2, a first power source D1, and a first resistor R1. The second switch K2, the first power supply D1 and the first resistor R1 are all connected in series in the detection loop, that is, after being connected in series, the three are connected in parallel with the load, so as to form the detection loop. The positional relationship between the three components can be adjusted according to the requirement and the circuit layout, and is not limited to a specific embodiment. In fig. 3, the control end of the second switch K2 is connected to the control unit 240, the first end of the second switch K2 is connected to the negative electrode of the output end of the switch unit 210, the second end of the second switch K2 is connected to the negative electrode of the first power source D1, the positive electrode of the first power source D1 is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is connected to the positive electrode of the output end of the switch unit 210. The second switch K2 is configured to be turned on when receiving the second on signal, so that the second switch K2, the first power supply D1, the first resistor R1 and the load 20 form a detection loop, and the second switch K2 is configured to be turned off when receiving the off signal, so as to turn off the detection loop.
In an embodiment of the present application, the second switch K2 in the detection unit 220 may be a MOS transistor or a relay. The second on signal may be a voltage signal, and the detecting unit 220 is turned on when the control unit 240 transmits the second voltage signal to the second switch K2, and the detecting unit 220 is turned off when the control unit 240 stops transmitting the second on signal to the second switch K2.
In one embodiment of the present application, the first power source D1 includes a voltage stabilizing source, that is, the voltage stabilizing source is used to supply power to the detection loop and the load 20, so that the sampling unit 230 connected to the detection loop may collect the relevant sampling signal. In one embodiment of the present application, the detecting unit 220 and the switching unit 210 are in a parallel connection relationship, and the operating state of the switching unit 210 and the operating state of the detecting unit 220 are independent, so that the detecting unit 220 does not operate when the switching unit 210 operates, or the detecting unit 220 does not operate when the switching unit 210 does not operate, or both the switching unit 210 and the detecting unit 220 do not operate through the transmission logic of the first conduction signal and the second conduction signal. This arrangement can prevent the electric power of the first power source D1 from flowing backward into the power supply circuit 11 or the electric power of the power supply circuit 11 from flowing backward into the first power source D1, resulting in damage to the first power source D1 or the power supply circuit 11.
In one embodiment of the present application, the sampling unit 230 includes a current sampling element A1, where the current sampling element A1 is connected in series in the detection loop, and the current sampling element A1 is configured to sample a current in the detection loop to output a current sampling electrical signal; the control unit 240 is configured to determine a load resistance value in the detection loop according to the current sampling electrical signal, the resistance value of the first resistor R1, and the power supply voltage of the first power supply D1.
In one embodiment of the present application, the sampling unit 230 may be an independent circuit, and the sampling unit 230 may continuously detect the electrical parameter in the detection loop and continuously output the sampling signal. Alternatively, the sampling unit 230 may also receive the control command sent by the control unit 240, and start to detect the electrical parameter in the detection loop or stop to detect the electrical parameter in the detection loop according to the trigger of the control command. The control unit 240 may send a control instruction to the sampling unit 230 when the second switch K2 is turned on, so that the second switch K2, the first power supply D1, the first resistor R1 and the load 20 form a detection loop to perform sampling, so that the sampling efficiency of the sampling unit 230 may be improved, and the problem that the sampling signal cannot be sampled due to sampling performed by the sampling unit 230 when the second switch K2, the first power supply D1, the first resistor R1 and the load 20 do not form a circuit is avoided.
In one embodiment of the present application, the control unit 240 determines the load resistance value in the detection loop according to the current sampling electrical signal, the resistance value of the first resistor R1, and the power supply voltage of the first power supply D1. Specifically, the control unit may calculate the load resistance value in the detection loop using the following formula:
u is the voltage provided by the first power supply D1, and when the first power supply D1 is a voltage stabilizing source, namely the voltage in the detection loop is stabilized, the voltage in the detection loop is set to be a known voltage value. The R1 is the resistance value of the first resistor R1, rf is the load resistance value, I is the current value of the collected current sampling signal, and as can be seen from the figure, the independent detection unit is arranged to detect the load resistance value, so that the detection precision can be improved, the detection of a low-power load can be realized, and the identification can be performed when the power load is connected.
In one embodiment of the present application, when the first power source D1 is not a voltage stabilizing source, that is, when the voltage U in the detection loop is not constant, the sampling unit 230 of the present application may further include a voltage sampling element V1 and a current sampling element A1, where the voltage sampling element V1 is connected in parallel to two ends of the first power source D1, and the voltage sampling element V1 is configured to sample the voltage in the detection loop so as to output a voltage sampling electrical signal; the current sampling element A1 is connected in series in the detection loop, and the current sampling element A1 is used for sampling the current in the detection loop so as to output a current sampling electric signal; the control unit 240 is configured to determine a load resistance value in the detection loop according to the current sampling electrical signal, the resistance value of the first resistor R1, and the voltage sampling electrical signal.
The voltage collected by the voltage sampling element V1 is U1. R1 is the resistance value of the first resistor R1, rf is the load resistance value of the load 20, I is the current value of the collected current sampling signal, and the load resistance value rf of the load 20 can be calculated according to the following formula:
in one embodiment of the present application, the voltage sampling element V1 may include a voltmeter, and the current sampling element A1 may include a ammeter.
In one embodiment of the present application, the detection unit 220 further includes an adjustable resistor R2 connected in series in the detection loop, and the adjustable resistor R2 is used for dividing the voltage of the load 20. When in use, the magnitude of the adjustable resistor can be adjusted according to the magnitude of the load resistance value rf of the load 20, for example, when the load resistance value rf of the load 20 is smaller, the corresponding first resistor R1 and adjustable resistor R2 are larger, and then the sampling value of the current sampling element A1 is not obviously changed according to the formula determined by the ohm law, so that the synchronous change of the resistance value of the adjustable resistor R2 and the magnitude of the load resistance value rf of the load 20 can be realized by adjusting the resistance value of the adjustable resistor R2, and the situation that the sampling error is larger due to the fact that the sampling value of the sampling unit is not obviously changed can be avoided.
Therefore, the calculation accuracy of the load resistance value can be further improved by utilizing the adjustable resistor R2. The resistance value of the adjustable resistor R2 is R2, the resistance value of the first resistor R1 is R1, the load resistance value of the load 20 is rf, the voltage value collected by the voltage sampling element V is U1, the current value collected by the ammeter is I, and the load resistance value rf of the load 20 can be calculated according to the following formula:
in order to avoid sampling errors, the resistance value of the adjustable resistor R2 can be adjusted for multiple times, and a plurality of load resistance values rf can be calculated, so that comparison or average is carried out, and a more accurate load resistance value is obtained.
In this embodiment, the switch unit 210 includes a first switch K1, a first end of the first switch K1 is connected to a load side of the power supply circuit, a second end of the first switch K1 is connected to the load 20, and a control end of the first switch K1 is connected to the control unit 240. The power supply device 10 may supply power to the load 20 by closing the first switch K1.
In one embodiment of the present application, when the output of the power supply circuit 11 is an ac output, the load side of the power supply device includes a first output end and a second output end, where the first output end may be a neutral output end N, and the second output end may be a live output end L. The switching unit 210 may further include a first switch K1 and a third switch K3. The first switch K1 has a first terminal connected to the first output terminal and a second terminal for connection to a live wire terminal of the load 20. The first end of the third switch K3 is connected to the second output terminal, and the second end is connected to the zero line end of the load 20. The first switch K1 and the third switch K3 are connected to the control unit 240, and the first switch K1 and the third switch K3 can be synchronously turned on by using the first turn-on signal of the control unit 240. The control unit 240 may also control the first switch K1 and the third switch K3 to be synchronously turned off. In addition, when the output of the power supply circuit 11 is a dc output, the first output terminal may be a positive terminal p+ (not shown), and the second output terminal may be a negative terminal P- (not shown).
In an embodiment of the present application, the first switch K1 and the third switch K3 may be MOS transistors or relays. The first on signal may be a voltage signal, and the switch unit 210 is turned on when the first on signal is transmitted to the first switch K1 and the third switch K3, and the switch unit 210 is turned off when the first on signal is stopped from being transmitted to the first switch K1 and the third switch K3.
In an embodiment of the present application, the first conduction signal and the second conduction signal are transmitted asynchronously, that is, when the first conduction signal is transmitted to the first switch K1 and the third switch K3, the transmission of the second conduction signal to the second switch K2 is stopped, so that the switch unit 210 and the detection unit 220 do not work in the same time period, and it is ensured that the electric energy is not injected into the detection unit 220 when the switch unit 210 transmits the electric energy to the output end, thereby causing damage to the detection unit 220, and also not causing the electric energy of the first power source D1 to be injected into the power supply device 10, resulting in damage to the power supply device 10.
In one embodiment of the present application, the load detection circuit further comprises a consumer unit connected in parallel with the detection unit. Wherein the depletion unit may comprise a third resistor R3, the third resistor R3 being arranged in parallel with the load.
Since a filter or other element (not shown) is further disposed on the load side of the power supply circuit, when the switch unit 210 turns off the power supply circuit, residual power still exists in the filter or other element in the power supply circuit, and when the detection circuit is turned on, the residual power may be poured into the sampling unit 230 from the detection circuit, thereby affecting the accuracy of the sampled electrical signal. The residual electricity can be consumed by arranging the consumption unit, so that the accuracy of sampling the electric signal is ensured.
When the consumption unit is the third resistor R3, the resistance value of the third resistor R3 is R3, the resistance value of the adjustable resistor R2 is R2, the resistance value of the first resistor R1 is R1, the load resistance value of the load 20 is rf, the voltage value collected by the voltmeter is U1, the current value collected by the ammeter is I, and the load resistance value rf of the load 20 can be calculated according to the following formula:
in the present embodiment, the control unit includes, but is not limited to, MCU (Microcontroller Unit, micro control unit), DSP (Digital Signal Processing/Processor, digital signal processing), MPU (Micro Processor Unit ), and the like, and the embodiment of the present application does not specifically limit the control unit.
The control unit 240 may transmit a first conductive signal to the switching unit 210, and control the switching unit 210 to be conductive by the first conductive signal, so that the power of the power supply apparatus 10 is transmitted to the load 20. Further, a first off signal may be transmitted to the switching unit 210, and the switching unit 210 may be controlled to be turned off by the first off signal, so that the power supply apparatus 10 stops transmitting the power to the load 20.
In one embodiment of the present application, the control unit 240 may further transmit a second on signal to the detection unit 220, and the detection circuit is controlled to be turned on by the second on signal, so that the sampling unit 230 may detect the electrical parameter in the detection circuit. And, a second off signal may also be transmitted to the detection unit 220, and the loop is opened by the second off signal control unit 240.
In one embodiment of the present application, the control unit 240 transmits the second turn-off signal to the detection unit 220 before transmitting the first turn-on signal to the switch unit 210, that is, before transmitting the electric energy to the load 20 connected to the output terminal, the detection loop formed with the load 20 is turned off, so as to avoid the electric energy transmitted to the load 20 from being poured into the detection unit 220 and the sampling unit 230 through the detection loop, and avoid damage to the detection unit 220 and the sampling unit 230.
In an embodiment of the present application, the control unit 240 transmits the first turn-off signal to the switch unit 210 before transmitting the second turn-on signal to the detection unit 220, that is, before connecting the detection unit 220 with the load 20 to form a detection loop for detection, the switch unit 210 is turned off, so as to avoid the electric energy transmitted to the load 20 from being poured into the detection unit 220 and the sampling unit 230 through the detection loop, and avoid damage to the detection unit 220 and the sampling unit 230.
The application also discloses a power supply device, as shown in fig. 4, and fig. 4 is a schematic structural diagram of the power supply device provided in the embodiment of the application. Specifically, the power supply apparatus 400 includes a power supply circuit 410 and the load detection circuit 420 described above. In the present embodiment, the load detection circuit 420 is provided inside the power supply apparatus, wherein the power supply circuit 410 may be a module that generates and outputs electric power in the power supply apparatus.
Specifically, the power supply circuit 410 may be a module that connects and outputs the commercial power. For example, the power supply circuit 410 may include an ac access terminal and a voltage conversion unit, wherein the voltage conversion unit may be an ac-dc conversion unit.
Specifically, the power supply circuit may include a battery unit 411 and a voltage conversion unit 412, where the voltage conversion unit is connected to the battery unit, and an output end of the voltage conversion unit is used as a load side of the power supply circuit; the voltage conversion unit converts the power supplied from the battery unit 411 into a target electrical signal and outputs the target electrical signal through the load side of the power supply circuit. The voltage conversion unit comprises a direct current-direct current conversion unit or a direct current-alternating current conversion unit.
In this embodiment, the power supply device may be an energy storage device, at this time, the battery unit 411 may be a battery in the energy storage device, and the voltage conversion unit 412 may be an inverter unit in the energy storage device, where the inverter unit is configured to convert direct current of the battery into alternating current and output the alternating current through a load side of the power supply circuit.
In this embodiment, the load detection circuit 420 of the power supply apparatus 400 may form a detection loop with a load through a detection unit, and detect an electrical parameter in the detection loop by using a sampling unit, output a sampling signal, receive the sampling signal through a control unit, determine a load resistance value, and after determining that the load resistance value is greater than a preset resistance value, the control unit controls the switch unit to be turned on, so as to supply power to the load. And moreover, the accessed load resistance value can be accurately detected, and the power supply equipment is controlled to output electric energy to the load according to the load resistance value, so that the problem that the accessed load cannot work normally due to the fact that the power supply equipment stops the electric energy output due to misjudgment of the load access can be avoided.
In this embodiment of the application, an electronic device is further provided, including the above power supply device. Wherein the power supply device comprises the load detection circuit. The electronic device can form a detection loop through the detection unit and the load, the sampling unit is used for detecting the electrical parameters in the detection loop, a sampling signal is output, the control unit is used for receiving the sampling signal and determining the load resistance value, and after the fact that the load resistance value is greater than the preset resistance value is determined, the control unit controls the switch unit to be turned on so as to supply power to the load. And moreover, the accessed load resistance value can be accurately detected, and the power supply equipment is controlled to output electric energy to the load according to the load resistance value, so that the problem that the accessed load cannot work normally due to the fact that the power supply equipment stops the electric energy output due to misjudgment of the load access can be avoided.
The embodiments of the present application have been described in detail above with reference to the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present application.
Claims (10)
1. The load detection circuit is characterized by being used for detecting whether a load is connected into the power supply circuit or not; the load detection circuit includes:
the switching unit is connected to the load side of the power supply circuit and used for conducting connection between the power supply circuit and the load when receiving a first conducting signal so as to enable the power supply circuit to supply power to the load;
the detection unit is connected with the output end of the switch unit and is used for forming a detection loop with a load; the detection unit is used for conducting the detection loop when receiving a second conducting signal;
the sampling unit is used for detecting the electric parameters in the detection loop so as to output a sampling electric signal;
the control unit is respectively connected with the switch unit, the detection unit and the sampling unit; the control unit is used for determining a load resistance value in the detection loop according to the sampling electric signal, outputting the first conduction signal when the load resistance value is larger than a preset resistance value, and outputting a disconnection signal to the detection unit;
the detection unit is also used for disconnecting the detection loop when the disconnection signal is received.
2. The load detection circuit of claim 1, wherein the detection unit comprises a second switch, a first power supply, and a first resistor;
the second switch, the first power supply and the first resistor are all connected in series in the detection loop;
the second switch is used for being conducted when the second conduction signal is received so as to conduct the detection loop, and is used for being disconnected when the disconnection signal is received so as to disconnect the detection loop.
3. The load detection circuit of claim 2, wherein the sampling unit includes a current sampling element connected in series in the detection loop, the current sampling element for sampling a current in the detection loop to output a current sampled electrical signal; the control unit is used for determining a load resistance value in the detection loop according to the current sampling electric signal, the resistance value of the first resistor and the power supply voltage of the first power supply.
4. The load detection circuit of claim 2, wherein the sampling unit further comprises a voltage sampling element and a current sampling element, the voltage sampling element being connected in parallel across the first power supply, the voltage sampling element being configured to sample the voltage in the detection loop to output a voltage sampled electrical signal; the current sampling element is connected in series in the detection loop and is used for sampling the current in the detection loop so as to output a current sampling electric signal;
the control unit is used for determining a load resistance value in the detection loop according to the current sampling electric signal, the resistance value of the first resistor and the voltage sampling electric signal.
5. The load detection circuit of claim 2, wherein the detection unit further comprises an adjustable resistor in series in the detection loop, the adjustable resistor for dividing the load.
6. The load detection circuit of claim 1, wherein the switching unit comprises a first switch, a first terminal of the first switch being connected to a load side of the power supply circuit, a second terminal of the first switch being connected to the load, a control terminal of the first switch being connected to the control unit.
7. The load detection circuit of claim 1, further comprising a consumer unit connected in parallel with the detection unit.
8. A power supply apparatus comprising a power supply circuit and a load detection circuit as claimed in any one of claims 1 to 7.
9. The power supply apparatus according to claim 8, wherein the power supply circuit includes a battery unit and a voltage conversion unit, the voltage conversion unit being connected to the battery unit, an output terminal of the voltage conversion unit being a load side of the power supply circuit; the voltage conversion unit is used for converting the power supply of the battery unit into a target electric signal and outputting the target electric signal through the load side of the power supply circuit.
10. An electronic device comprising a power supply apparatus as claimed in any one of the preceding claims 8 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222766537.1U CN218974478U (en) | 2022-10-20 | 2022-10-20 | Load detection circuit, power supply equipment and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222766537.1U CN218974478U (en) | 2022-10-20 | 2022-10-20 | Load detection circuit, power supply equipment and electronic device |
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| CN218974478U true CN218974478U (en) | 2023-05-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116995678A (en) * | 2023-09-26 | 2023-11-03 | 深之蓝(天津)水下智能科技有限公司 | Power supply device and underwater cable-controlled robot |
| CN117294132A (en) * | 2023-11-23 | 2023-12-26 | 深圳市鼎阳科技股份有限公司 | Power supply circuit and switching method thereof |
-
2022
- 2022-10-20 CN CN202222766537.1U patent/CN218974478U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116995678A (en) * | 2023-09-26 | 2023-11-03 | 深之蓝(天津)水下智能科技有限公司 | Power supply device and underwater cable-controlled robot |
| CN116995678B (en) * | 2023-09-26 | 2024-02-13 | 深之蓝(天津)水下智能科技有限公司 | Power supply device and underwater cable-controlled robot |
| CN117294132A (en) * | 2023-11-23 | 2023-12-26 | 深圳市鼎阳科技股份有限公司 | Power supply circuit and switching method thereof |
| CN117294132B (en) * | 2023-11-23 | 2024-03-01 | 深圳市鼎阳科技股份有限公司 | Power supply circuit and switching method thereof |
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