CN219659582U - Slow start circuit, power supply circuit and electronic equipment - Google Patents
Slow start circuit, power supply circuit and electronic equipment Download PDFInfo
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- CN219659582U CN219659582U CN202223297203.0U CN202223297203U CN219659582U CN 219659582 U CN219659582 U CN 219659582U CN 202223297203 U CN202223297203 U CN 202223297203U CN 219659582 U CN219659582 U CN 219659582U
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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
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Abstract
The utility model belongs to the technical field of power supply circuits, and provides a slow start circuit, a power supply circuit and electronic equipment.
Description
Technical Field
The utility model belongs to the technical field of power supply circuits, and particularly relates to a slow start circuit, a power supply circuit and electronic equipment.
Background
In most power supply devices, capacitors are provided to achieve stable output of electric energy, for example, when a maximum power tracking (MPPT) circuit is powered by solar energy, in order to enable the MPPT circuit to be stably started, a row of electrolytic capacitors is typically connected in parallel between a solar energy input terminal and the MPPT circuit. Meanwhile, a pre-charging circuit is also arranged in the power supply equipment so as to prevent the capacitor from being impacted by large current during charging.
However, the control of the precharge circuit at present has the problems of high cost and long response time.
Disclosure of Invention
The utility model aims to provide a slow start circuit, a power supply circuit and electronic equipment, and aims to solve the problems of high cost and long response time in the control of the existing precharge circuit.
An embodiment of the present utility model provides a soft start circuit, connected to an input terminal of a voltage conversion circuit, for performing soft start on the voltage conversion circuit, where the soft start circuit includes:
the main switch circuit is arranged at the input end of the voltage conversion circuit and is used for being conducted when receiving a main switch conducting signal so as to control a power supply to supply power to the voltage conversion circuit through the main switch circuit;
the pre-charging circuit is connected in parallel with the main switching circuit and is used for being conducted when a pre-charging signal is received, so that the power supply source pre-charges the input end of the voltage conversion circuit through the pre-charging circuit and is disconnected under the control of the input end voltage when the input end voltage of the voltage conversion circuit rises to a preset pre-charging voltage; the impedance on the precharge circuit is greater than the impedance on the main switching circuit;
and the control circuit is connected with the main switch circuit and the pre-charging circuit and is used for outputting the pre-charging signal and outputting the main switch conduction signal when the voltage conversion circuit finishes pre-charging.
In one embodiment, the precharge circuit includes a precharge switching unit, a first current limiting unit, a first voltage dividing unit, and an energy storage unit:
the control end of the pre-charging switch unit is respectively connected with the first end of the energy storage unit, the first end of the first voltage dividing unit and the control circuit, the first end of the pre-charging switch unit is used for being connected with the first current limiting unit in series and then connected with the power supply, the second end of the pre-charging switch unit is respectively connected with the second end of the energy storage unit and the second end of the first voltage dividing unit, the second end of the energy storage unit is connected with the input end of the voltage conversion circuit, and the energy storage unit is used for charging when receiving the pre-charging signal; the pre-charge switch unit is used for being conducted when the voltage difference between the first end and the second end of the energy storage unit is larger than the conducting threshold voltage, and being turned off when the voltage difference between the first end and the second end of the energy storage unit is smaller than the turning-off threshold voltage.
In one embodiment, the precharge switching unit includes a MOS transistor; the drain electrode of the MOS tube is used as the first end of the pre-charging switch unit, and the source electrode of the MOS tube is used as the second end of the pre-charging switch unit; and the grid electrode of the MOS tube is used as the control end of the pre-charging switch unit.
In one embodiment, the precharge circuit further comprises:
the first end of the second current limiting unit is used for being connected with the control circuit, the second end of the second current limiting unit is connected with the first end of the energy storage unit, and the second current limiting unit is used for limiting the current of the pre-charging signal; and/or
And the backflow preventing unit is respectively connected with the pre-charging switch unit and the power supply and is used for preventing current at the input end of the voltage conversion circuit from flowing backward to the power supply.
In one embodiment, the energy storage unit includes a first capacitor; the first voltage dividing unit comprises a first resistor;
the first end of the first resistor and the first end of the first capacitor are connected with the control end of the pre-charging switch unit, and the second end of the first resistor and the second end of the first capacitor are connected with the second end of the pre-charging switch unit.
In one embodiment, the second current limiting unit includes: a second resistor and a first diode;
the first end of the second resistor is connected with the control end of the pre-charging switch unit, the second end of the second resistor is connected with the cathode of the first diode, and the anode of the first diode is connected with the control circuit.
In one embodiment, the main switching circuit includes:
the main switch unit is arranged between the power supply and the voltage conversion circuit;
and the driving unit is connected with the control circuit and the main switch unit and is used for generating a switch control signal according to the main switch on signal so as to control the on or off of the main switch unit.
In one embodiment, the main switching unit includes: a relay, a second capacitor, and a third diode;
the first end of the contact group of the relay is connected with the power supply, the second end of the contact group of the relay is connected with the power supply, the first end of the coil of the relay and the anode of the third diode are commonly connected with the output end of the driving unit, the second end of the coil of the relay, the cathode of the third diode and the first end of the second capacitor are commonly connected with the power supply of the relay, and the second end of the second capacitor is grounded.
The second aspect of the embodiment of the present utility model further provides a power supply circuit, including: a voltage conversion circuit as claimed in any one of the preceding claims.
A third aspect of the embodiment of the present utility model further provides an electronic device, including a power supply circuit as described in the foregoing embodiment.
The embodiment of the utility model provides a slow start circuit, a power supply circuit and electronic equipment. The slow start circuit comprises a main switch circuit, a pre-charging circuit and a control circuit, wherein the impedance on the pre-charging circuit is larger than that on the main switch circuit, a pre-charging signal is sent to the pre-charging circuit through the control circuit, so that a power supply source pre-charges the input end of the voltage conversion circuit through the pre-charging circuit, and is disconnected when the voltage of the input end of the voltage conversion circuit rises to a preset pre-charging voltage, the pre-charging of the voltage conversion circuit is completed, and a main switch conduction signal is output through the control circuit so as to control the power supply source to supply power to the voltage conversion circuit through the main switch circuit. The pre-charging circuit in the utility model can be disconnected under the control of the input end voltage when the input end voltage of the voltage conversion circuit rises to the preset pre-charging voltage, so that the pre-charging circuit has quicker response time, and the pre-charging circuit does not need to be turned off by a special driving circuit, thereby simplifying the circuit structure and saving the cost.
Drawings
Fig. 1 is a schematic circuit diagram of a power supply circuit according to one embodiment of the present utility model;
fig. 2 is a schematic circuit diagram of a power supply circuit according to one embodiment of the present utility model;
fig. 3 is a schematic circuit diagram of a power supply circuit according to one embodiment of the present utility model;
fig. 4 is a schematic circuit diagram of a power supply circuit according to one embodiment of the present utility model;
fig. 5 is a schematic circuit diagram of a power supply circuit according to one embodiment of the present utility model;
fig. 6 is a schematic circuit diagram of a power supply circuit according to an embodiment of the present utility model;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present utility model.
Detailed Description
In order that those skilled in the art will better understand the present utility model, a technical solution of an embodiment of the present utility model will be clearly described below with reference to the accompanying drawings in the embodiment of the present utility model, and it is apparent that the described embodiment is a part of the embodiment of the present utility model, but not all the embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
The term "comprising" in the description of the utility model and the claims and in the above figures and any variants thereof is intended to cover a non-exclusive inclusion. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may optionally include additional steps or elements not listed or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order.
In the related art, the precharge circuit needs to be turned off by a special driving circuit, and the precharge circuit is controlled to be turned off by the driving circuit, so that the response time is long, if the precharge circuit is turned off too early, the electrolytic capacitor cannot be effectively protected, and if the precharge circuit is turned off too late, the electric energy is consumed by the precharge circuit, so that the problem of high energy consumption is caused. Therefore, the related art has a problem of high cost and long response time for controlling the precharge circuit.
In order to solve the above-mentioned technical problems, an embodiment of the present utility model provides a slow start circuit, as shown in fig. 1, the slow start circuit 900 in this embodiment is applied to a power supply circuit, and the slow start circuit 900 is disposed between the power supply 100 and an input terminal of the voltage conversion circuit 600. The voltage conversion circuit 600 includes a capacitor unit 610 and a voltage conversion unit 620, where the capacitor unit 610 is disposed at an input terminal of the voltage conversion circuit 600 to stabilize a voltage input to the voltage conversion circuit 600, and ensure that the voltage conversion unit 620 is stably started for voltage conversion of the voltage conversion circuit 600, and for example, the voltage conversion unit 620 may be an MPPT unit or a DC-DC unit or an AC-DC unit, which is not limited in this utility model.
When the circuit is started, the capacitor unit 610 is usually not powered, and the impedance is small, so that the impact current in the starting process is large, and the circuit is damaged. The voltage conversion circuit 600 can be slowly started by the slow start circuit 900 in the present embodiment to avoid a large current during the starting process.
Referring to fig. 1, the slow start circuit 900 in this embodiment includes: a main switching circuit 200, a precharge circuit 400, and a control circuit 500.
The main switch circuit 200 is disposed at an input end of the voltage conversion circuit 600, a first end and a second end of the main switch circuit 200 are respectively connected to the power supply 100 and the voltage conversion circuit 600, and a control end of the main switch circuit 200 is used for receiving a main switch on signal, and specifically, the main switch circuit 200 is turned on when receiving the main switch on signal, so as to control the power supply 100 to supply power to the voltage conversion circuit 600 through the main switch circuit 200.
The precharge circuit 400 is connected in parallel with the main switch circuit 200, and a first terminal and a second terminal thereof are respectively connected to the first terminal and the second terminal of the main switch circuit 200, and a control terminal of the precharge circuit 400 is used for receiving a precharge signal. Specifically, the precharge circuit 400 is turned on when receiving the precharge signal, so that the power supply 100 precharges the input terminal of the voltage conversion circuit 600 through the precharge circuit 400, and is turned off under the control of the input terminal voltage when the input terminal voltage of the voltage conversion circuit 600 rises to the preset precharge voltage.
In this embodiment, the impedance of the precharge circuit 400 is larger than the impedance of the main switch circuit 200, so that the current output to the input end of the voltage conversion circuit 600 through the precharge circuit 400 can be ensured to be smaller, and the precharge current output by the precharge circuit 400 is prevented from impacting the capacitance of the input end of the voltage conversion circuit 600 and the subsequent circuit. When the voltage of the input end of the voltage conversion circuit 600 rises to the preset pre-charging voltage, the voltage between the control end and the second end of the pre-charging circuit 400 is lower than the turn-off threshold voltage, so that the pre-charging circuit 400 is controlled to be turned off, the automatic turn-off of the pre-charging circuit 400 is realized, and the response speed is high. Meanwhile, when the precharge circuit 400 is turned off, the precharge circuit 400 can be turned off without a special driving circuit, so that the circuit structure is simplified, and the cost is reduced.
The control circuit 500 is connected to the main switch circuit 200 and the precharge circuit 400, and the control circuit 500 is configured to output a precharge signal and output a main switch on signal when the voltage conversion circuit completes the precharge. The control circuit 500 may set a preset time as the precharge time, and confirm that the voltage conversion circuit completes the precharge when the output precharge signal reaches the preset time, thereby outputting the main switch on signal. The control circuit 500 may also sample the voltage at the input terminal of the voltage conversion circuit 600, and when the voltage at the input terminal is greater than the preset precharge voltage, consider that it has completed the precharge, so as to output the main switch on signal.
In this embodiment, the power supply 100 is configured to supply power to the voltage conversion circuit 600, and the control circuit 500 outputs the precharge signal to the precharge circuit 400, so that the precharge circuit 400 is turned on, and the power supply 100 performs the precharge of the voltage conversion circuit 600 through the precharge circuit 400. The precharge circuit 400 is turned off under control of the input terminal voltage when the input terminal voltage of the voltage conversion circuit 600 rises to a preset precharge voltage, and the control circuit 500 outputs a main switch on signal to the main switch circuit 200 when the voltage conversion circuit 600 completes the precharge. At this time, the main switch circuit 200 is turned on, and the power supply 100 supplies power to the voltage conversion circuit 600 through the main switch circuit 200, so that when the voltage of the input end of the voltage conversion circuit 600 rises to the preset pre-charging voltage, the slow start circuit 900 is automatically turned off, and the response speed is faster. In addition, the utility model does not need to switch off the precharge circuit by a special drive circuit for presetting precharge voltage, thereby simplifying the circuit structure and saving the cost.
In one embodiment, as shown in connection with fig. 2, the precharge circuit 400 includes a precharge switching unit 410, a first current limiting unit 430, a first voltage dividing unit 460, and an energy storage unit 420.
In this embodiment, the control end of the pre-charging switch unit 410 is connected to the first end of the energy storage unit 420, the first end of the first voltage dividing unit 460 and the control circuit 500, the first end of the pre-charging switch unit 410 is connected to the power supply 100 after being connected in series with the first current limiting unit 430, the second end of the pre-charging switch unit 410 is connected to the second end of the energy storage unit 420 and the second end of the first voltage dividing unit 460, respectively, and the second end of the energy storage unit 420 is connected to the input end of the voltage conversion circuit 600. The energy storage unit 420 performs charging upon receiving the precharge signal. The pre-charge switch unit 410 is configured to be turned on when a voltage difference between the first terminal and the second terminal of the energy storage unit 420 is greater than an on threshold voltage, and turned off when the voltage difference between the first terminal and the second terminal of the energy storage unit 420 is less than an off threshold voltage. Since the voltage at the first end of the energy storage unit 420 is equal to the voltage of the pre-charge signal, and the voltage at the second end is equal to the voltage at the input end of the voltage conversion circuit 600, the pre-charge switch unit 410 can perform on-off control according to the pre-charge signal and the voltage on the capacitor unit 610, so that no other driving circuits and control signals are needed, and the response speed is high and the circuit structure is simplified. The off threshold voltage and the on threshold voltage of the present utility model may be the same magnitude of voltage value. In other embodiments, the two values may also be set such that the off threshold voltage is less than the on threshold voltage, thereby avoiding the precharge switching unit 410 from being repeatedly switched.
In this embodiment, when the precharge signal is received, the precharge signal charges the energy storage unit 420, and the voltage on the capacitor unit 610 is equal to 0 because no electric quantity exists thereon, so that when the energy storage unit 420 is charged for a certain time, the voltage difference between the first terminal and the second terminal of the energy storage unit is greater than the turn-on threshold voltage, so that the precharge switch unit 410 is turned on. At this time, the power supply 100 pre-charges the voltage conversion circuit 600 through the first current limiting unit 430 and the pre-charging switch unit 410, and due to the effect of the first current limiting unit 430, the current of the power supply 100 pre-charging the voltage conversion circuit 600 through the pre-charging switch unit 410 is smaller, so that the impact of the pre-charging current on the voltage conversion circuit 600 can be avoided. After the precharge switching unit 410 is turned on, the capacitor unit 610 at the input end of the voltage conversion circuit 600 is precharged under the effect of the precharge current, the voltage at the input end of the voltage conversion circuit 600 continuously rises, and the voltage at both ends of the capacitor unit 610 at the input end of the corresponding voltage conversion circuit 600 also continuously rises. When the voltage difference between the first end and the second end of the energy storage unit 420 is greater than the turn-on threshold voltage of the pre-charge switch unit 410, the pre-charge switch unit 410 is always in a turned-on state, so that the power supply 100 can be controlled to pre-charge the capacitor unit 610. When the capacitor unit 610 is pre-charged to a certain state, the voltage thereon increases until the voltage is greater than the voltage of the pre-charge signal, so that the voltage difference between the first end and the second end of the energy storage unit 420 is smaller than the turn-off threshold voltage of the pre-charge switch unit 410, and at this time, the voltage difference between the control end and the second end of the pre-charge switch unit 410 is smaller than the turn-off threshold voltage, so that the pre-charge switch unit 410 is turned off, thereby realizing automatic turn-off of the pre-charge circuit 400.
In one embodiment, the precharge switching unit 410 includes a MOS transistor. The drain electrode of the MOS tube is used as the first end of the pre-charging switch unit 410, and the source electrode of the MOS tube is used as the second end of the pre-charging switch unit 410; the gate of the MOS transistor is used as the control terminal of the precharge switching unit 410.
In one embodiment, as shown in connection with fig. 3, the precharge circuit 400 further includes a second current limiting unit 440. The first end of the second current limiting unit 440 is connected to the control circuit 500, the second end of the second current limiting unit 440 is connected to the first end of the energy storage unit 420, and the second current limiting unit 440 is used for limiting the pre-charge signal.
In this embodiment, the second current limiting unit 440 is connected between the control circuit 500 and the energy storage unit 420, and can perform current limiting processing on the pre-charge signal output by the control circuit 500, so as to avoid the impact on the energy storage unit 420 caused by excessive current of the pre-charge signal.
In one embodiment, as shown in connection with fig. 4, the precharge circuit 400 further includes a backflow prevention unit 450.
The anti-reverse current unit 450 is connected to the pre-charge switch unit 410 and the power supply 100, respectively, for preventing the current at the input terminal of the voltage conversion circuit 600 from reverse current to the power supply 100.
In this embodiment, the anti-backflow unit 450 is disposed between the power supply 100 and the pre-charging switch unit 410, so as to prevent the input end capacitor of the voltage conversion circuit 600 from discharging to cause the backflow of electric energy to the power supply 100, thereby ensuring the safety of the power supply 100 and avoiding potential safety hazards.
In one embodiment, as shown in connection with fig. 5, the pre-charge circuit 400 further includes both a second current limiting unit 440 and a backflow preventing unit 450.
In this embodiment, the working principles of the second flow limiting unit 440 and the backflow preventing unit 450 are as described in the above embodiments, and are not described herein.
In one embodiment, as shown in connection with fig. 6, the first voltage dividing unit 460 includes a first resistor R1, and the energy storage unit 420 includes a first capacitor C1.
Specifically, the first end of the first resistor R1 and the first end of the first capacitor C1 are commonly connected to the control end of the pre-charge switch unit 410, and the second end of the first resistor R1 and the second end of the first capacitor C1 are commonly connected to the second end of the pre-charge switch unit 410.
In one embodiment, by setting the parameters of the first resistor R1 and the first capacitor C1, the turn-off timing of the pre-charge switch unit 410 may be determined, for example, by setting the capacitance value of the first capacitor C1 to be consistent with the capacitance value of the capacitor unit 610, when the input terminal voltage of the voltage conversion circuit 600 rises to the preset pre-charge voltage, the voltage difference between the control terminal voltage of the pre-charge switch unit 410 and the second terminal voltage of the pre-charge switch unit is just smaller than the turn-off threshold voltage of the pre-charge switch unit 410, and at this time, the pre-charge switch unit 410 may be automatically turned off.
In one embodiment, as shown in connection with fig. 6, the second current limiting unit 440 includes: a second resistor R2 and a first diode D1.
The first end of the second resistor R2 is connected to the control end of the precharge switching unit 410, the second end of the second resistor R2 is connected to the cathode of the first diode D1, and the anode of the first diode D1 is connected to the control circuit 500.
In this embodiment, the second resistor R2 and the first diode D1 are disposed at the output end of the control circuit 500, so as to perform current limiting processing ON the pre-charge signal pv_on2 provided by the control circuit 500, thereby avoiding the impact ON the device at the rear end caused by the excessive current of the pre-charge signal pv_on2, and simultaneously, the cathode of the first diode D1 is disposed to connect the energy storage unit 420, so that the current generated during the discharging of the energy storage unit 420 can be prevented from flowing backward to the control circuit 500.
In one embodiment, as shown in connection with fig. 6, the anti-backflow unit 450 includes a second diode D2; the first current limiting unit 430 includes a third resistor R3.
The first end of the third resistor R3 is connected to the input end of the pre-charge switch unit 410, the second end of the third resistor R3 is connected to the cathode of the second diode D2, and the anode of the second diode D2 is connected to the power supply 100.
In one embodiment, as shown in fig. 6, the pre-charging switch unit 410 includes a first switch tube Q1, a first end of the first switch tube Q1 is connected to the power supply 100 as a first end of the pre-charging switch unit 410, a second end of the first switch tube Q1 is connected to an input end of the voltage conversion circuit 600 as a second end of the pre-charging switch unit 410, and a control end of the first switch tube Q1 is connected to the control circuit 500 as a control end of the pre-charging switch unit 410. Specifically, when the first switching tube Q1 is an NMOS tube, the source and the gate of the first switching tube Q1 are respectively connected to two ends of the first voltage dividing unit 460. When the precharge signal pv_on2 is at a high level, the first switching transistor Q1 is turned ON when the voltage difference between the source and the gate of the first switching transistor Q1 is greater than the turn-ON threshold voltage. Since the voltage at the first end of the energy storage unit 420 is equal to the voltage of the pre-charge signal, and the voltage at the second end is equal to the voltage of the voltage conversion circuit 600, that is, the voltage on the capacitor unit 610, the NMOS transistor can be controlled to be on-off according to the pre-charge signal and the voltage on the capacitor unit 610, so that no other driving circuit and control signal are needed, and the device has a faster response speed and a simplified circuit structure.
In this embodiment, the control circuit 500 provides a pre-charge signal pv_on2 to the control terminal of the first switching tube Q1, where the pre-charge signal pv_on2 is used to control the first switching tube Q1 to be turned ON, and the voltage of the capacitor at the input terminal of the voltage conversion circuit 600 is 0V, and the voltage at the control terminal of the first switching tube Q1 is also 0V. After the pre-charge signal pv_on2 is subjected to the current limiting process by the first diode D1 and the second resistor R2, the voltage difference between the control end and the second end of the first switch Q1 is turned ON because the voltage difference is greater than the turn-ON threshold voltage when the first capacitor C1 is charged to a preset pre-charge voltage value, and the first capacitor C1 is charged with the first capacitor C1.
After the first switching tube Q1 is turned on, the positive terminal pvs+ of the power supply 100 charges the input terminal capacitor of the voltage conversion circuit 600 through the second diode D2, the third resistor R3, and the first switching tube Q1. Because of the current limiting function of the third resistor R3, the current of the power supply 100 for precharging the voltage conversion circuit 600 through the first switching tube Q1 is smaller, so that the impact of the precharge current on the voltage conversion circuit 600 can be avoided. As the precharge proceeds, the capacitor unit 610 at the input of the voltage conversion circuit 600 is precharged by the precharge current, and the voltage at the input of the voltage conversion circuit 600 increases continuously, and the voltage at both ends of the capacitor unit 610 at the input of the corresponding voltage conversion circuit 600 also increases continuously. When the voltage across the first capacitor C1 is greater than the on threshold voltage of the first switching tube Q1, the first switching tube Q1 is always in the on state, so that the power supply 100 can be controlled to precharge the capacitor unit 610. When the capacitor unit 610 is pre-charged to a certain state, the voltage ON the capacitor unit is greater than the voltage of the pre-charging signal pv_on2, so that the voltage across the first capacitor C1 is less than the turn-off threshold voltage of the first switching tube Q1, and the pre-charging signal pv_on2 loses the control capability of the first switching tube Q1. However, the first capacitor C1 also holds a certain voltage and discharges through the first resistor R1, so that the voltage of the first capacitor C1 also drops slowly. When the voltage of the first capacitor C1 drops below the threshold voltage of the first switching transistor Q1, the first switching transistor Q1 is turned off, and the precharge circuit 400 automatically exits, so that the input capacitor of the voltage conversion circuit 600 is not charged through the precharge circuit 400.
In one embodiment, the power supply 100 may be a photovoltaic module, and the voltage conversion unit 620 of the voltage conversion circuit 600 may be an MPPT circuit.
In one embodiment, the solar cell may output a 24V voltage signal, the first switching tube Q1 is an N-type MOS tube, and the corresponding control circuit 500 provides a 12V high-level pre-charge signal pv_on2. The operation principle of the slow start circuit in fig. 6 is described in detail below.
When the anode of the first diode D1 inputs the precharge signal pv_on2 and the first switching tube Q1 is an NMOS tube, the first capacitor C1 is rapidly charged to 12V when the precharge signal pv_on2 is a high level signal, and the voltage difference between the source and the gate of the first switching tube Q1 is greater than the turn-ON threshold voltage. After the first switching tube Q1 is turned on, the positive terminal pvs+ of the power supply 100 charges the capacitor unit 610 through the second diode D2, the third resistor R3 and the first switching tube Q1, the voltage at the input end of the voltage conversion circuit 600 continuously increases, and the voltage at the two ends of the capacitor unit 610 at the input end of the corresponding voltage conversion circuit 600 also continuously increases. When the capacitor unit 610 is charged to a certain voltage, for example, approximately 12V, the voltage ON the capacitor unit is greater than the voltage of the pre-charge signal pv_on2, so that the voltage across the first capacitor C1 is less than the turn-off threshold voltage of the first switching tube Q1, and the pre-charge signal pv_on2 loses the control capability of the first switching tube Q1, and the pre-charge is stopped. Accordingly, the first capacitor C1 can realize the delayed turn-off of the precharge circuit 400, and can maintain the precharge for a certain period of time after the voltage signal outputted from the solar cell is similar to the voltage at the input terminal of the voltage conversion circuit 600.
In one embodiment, the control circuit 500 may detect the input voltage of the voltage conversion circuit 600, and if the input voltage of the voltage conversion circuit 600 is close to the voltage of the voltage signal output by the solar cell, the control circuit 500 may output the main switch ON signal pv_on1 to trigger the relay J1 to be closed. Or after the control circuit 500 starts to count after the preset time passes after outputting the precharge signal pv_on2, the control circuit 500 may output the main switch ON signal pv_on1 to trigger the relay J1 to be closed. And after the relay J1 is closed, the MPPT circuit can work normally.
In one embodiment, as shown in connection with fig. 6, the voltage conversion circuit 600 includes a capacitance unit 610 and a voltage conversion unit 620, where the voltage conversion unit 620 is configured to perform voltage conversion on an input voltage, and the capacitance unit 610 may be composed of an input terminal capacitance C0. The input end capacitor C0 is connected to the input end of the voltage conversion unit 620, and the input end capacitor C0 is connected in parallel to the input end of the input end capacitor C0, so that the voltage of the input end can be converted when the input end is connected to the input voltage, and damage to the voltage conversion unit 620 caused by overlarge input current and input voltage can be avoided.
In one embodiment, the first switching transistor Q1 may be an N-type MOS transistor or an NPN transistor.
In one embodiment, as shown in connection with fig. 6, the main switching circuit 200 includes: a main switching unit 210 and a driving unit 220.
Specifically, the main switch unit 210 is disposed between the power supply 100 and the voltage conversion circuit 600; the driving unit 220 is connected to the control circuit 500 and the main switch unit 210, and is configured to generate a switch control signal according to the main switch on signal, so as to control the main switch unit 210 to be turned on or turned off.
In one embodiment, as shown in connection with fig. 6, the main switching unit 210 includes: relay J1, second capacitor C2, and third diode D3.
Specifically, a first end of the contact set of the relay J1 is connected to the power supply 100, a second end of the contact set of the relay J1 is connected to the voltage conversion circuit 600, a first end of the coil of the relay J1 and an anode of the third diode D3 are commonly connected to the driving unit 220, a second end of the coil of the relay J1, a cathode of the third diode D3 and a first end of the second capacitor C2 are commonly connected to the relay power supply VCC, and a second end of the second capacitor C2 is grounded.
In this embodiment, the third diode D3 is connected in parallel with the coil of the relay J1, and may be used as a freewheeling diode of the coil of the relay J1, so as to prevent the coil from remaining with current after the contact set of the relay J1 is disconnected, and may drain the current through the third diode D3, so as to avoid damaging the circuit.
In one embodiment, as shown in connection with fig. 6, the driving unit 220 includes: the second switch tube Q2, the third capacitor C3, the fourth resistor R4 and the fifth resistor R5.
Specifically, the first end of the fourth resistor R4 is connected to the control circuit 500, the second end of the fourth resistor R4, the first end of the third capacitor C3, the first end of the fifth resistor R5, and the control end of the second switching tube Q2 are commonly connected, the first end of the second switching tube Q2 is connected to the main switching unit 210, and the second end of the third capacitor C3, the second end of the fifth resistor R5, and the second end of the second switching tube Q2 are commonly grounded.
In this embodiment, the control circuit 500 provides the first ends of the main switch ON signals pv_on1 to the fourth resistor R4, the fourth resistor R4 is used for limiting the current of the main switch ON signals pv_on1, the third capacitor C3 and the fifth resistor R5 are used for filtering the main switch ON signals pv_on1, the main switch ON signals pv_on1 are used for controlling the second switching tube Q2 to be turned ON, after the second switching tube Q2 is turned ON, the coil of the relay J1 is controlled to be powered ON, the contact set of the relay J1 is closed, and the relay J1 is turned ON, so that a path is formed between the positive terminal pvs+ and the negative terminal PVs of the power supply 100 and the voltage conversion circuit 600.
In this embodiment, the relay power supply VCC is configured to provide a driving voltage for the coil of the relay J1, and the second capacitor C2 may be used as a bypass capacitor of the relay power supply VCC, to bypass the relay power supply VCC, to provide energy for the relay J1, so that no external electrolytic capacitor is required to provide energy, and a certain filtering effect may be achieved.
In one embodiment, the relay power supply VCC may provide a voltage of 12V.
The embodiment of the utility model also provides a power supply circuit, referring to fig. 1, including: voltage conversion circuit 600 and soft start circuit 900 according to any of the above.
In one embodiment, the power supply circuit may be used for connecting to the power supply 100 and used for accessing a power supply signal, where the power supply 100 is connected to the voltage conversion circuit 600 after passing through the slow start circuit in any one of the above embodiments, an input end capacitor is connected in parallel to an input end of the voltage conversion circuit 600, and the voltage conversion circuit 600 is used for performing voltage conversion processing on the input end voltage and outputting the voltage to the electric equipment.
In one embodiment, the power supply 100 may also be a battery, which may be a dry cell or an energy storage battery. The power supply 100 may be a solar charging device.
The power supply circuit provided by the embodiment of the utility model can realize that the precharge circuit is automatically disconnected when the voltage of the input end of the voltage conversion circuit rises to the preset precharge voltage, the disconnection time is accurate, a special circuit is not required to detect the precharge state of the input end of the voltage conversion circuit, and the cost is saved.
The embodiment of the utility model also provides electronic equipment, which comprises the power supply circuit.
In one embodiment, as shown in connection with fig. 7, the electronic device 700 may further include a soft-start circuit 900, a voltage conversion circuit 600, and a battery module.
The electronic device may be connected to the power supply 100, and the battery module in the electronic device may be powered by the power supply 100. In this embodiment, the power supply 100 is configured to provide a power supply signal, the soft-start circuit 900 is connected between the power supply 100 and the voltage conversion circuit 600, the soft-start circuit 900 is configured to perform soft-start on the voltage conversion circuit 600, and the voltage conversion circuit 600 generates a charging signal for charging the battery module according to the power supply signal provided by the power supply 100, so that the voltage conversion circuit 600 is configured to perform stable charging on the battery module after stable start.
In other embodiments, the power supply 100 may also be integrated into the electronic device 700, such that the electronic device has an energy storage function.
The electronic equipment provided by the utility model can realize that the precharge circuit is automatically disconnected when the voltage of the input end of the voltage conversion circuit rises to the preset precharge voltage, the disconnection time is accurate, a special circuit is not required to be adopted to detect the precharge state of the input end of the voltage conversion circuit, and the cost is saved.
In addition, each functional unit in the embodiments of the present utility model may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units described above may be implemented in hardware.
The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; 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, and are intended to be included in the scope of the present utility model.
Claims (10)
1. The utility model provides a slow start circuit which characterized in that is connected with voltage conversion circuit's input for to voltage conversion circuit carries out slow start, slow start circuit includes:
the main switch circuit is arranged at the input end of the voltage conversion circuit and is used for being conducted when receiving a main switch conducting signal so as to control a power supply to supply power to the voltage conversion circuit through the main switch circuit;
the pre-charging circuit is connected in parallel with the main switching circuit and is used for being conducted when a pre-charging signal is received, so that the power supply source pre-charges the input end of the voltage conversion circuit through the pre-charging circuit, and the power supply source is disconnected under the control of the input end voltage when the input end voltage of the voltage conversion circuit rises to a preset pre-charging voltage; the impedance on the precharge circuit is greater than the impedance on the main switching circuit;
and the control circuit is connected with the main switch circuit and the pre-charging circuit and is used for outputting the pre-charging signal and outputting the main switch conduction signal when the voltage conversion circuit finishes pre-charging.
2. The slow start circuit of claim 1, wherein the precharge circuit comprises a precharge switching unit, a first current limiting unit, a first voltage dividing unit, and an energy storage unit:
the control end of the pre-charging switch unit is respectively connected with the first end of the energy storage unit, the first end of the first voltage dividing unit and the control circuit, the first end of the pre-charging switch unit is used for being connected with the first current limiting unit in series and then connected with the power supply, the second end of the pre-charging switch unit is respectively connected with the second end of the energy storage unit and the second end of the first voltage dividing unit, the second end of the energy storage unit is connected with the input end of the voltage conversion circuit, and the energy storage unit is used for charging when receiving the pre-charging signal; the pre-charge switch unit is used for being conducted when the voltage difference between the first end and the second end of the energy storage unit is larger than the conducting threshold voltage, and being turned off when the voltage difference between the first end and the second end of the energy storage unit is smaller than the turning-off threshold voltage.
3. The slow start circuit according to claim 2, wherein the precharge switching unit comprises a MOS transistor; the drain electrode of the MOS tube is used as the first end of the pre-charging switch unit, and the source electrode of the MOS tube is used as the second end of the pre-charging switch unit; and the grid electrode of the MOS tube is used as the control end of the pre-charging switch unit.
4. The slow start circuit of claim 2, wherein the pre-charge circuit further comprises:
the first end of the second current limiting unit is used for being connected with the control circuit, the second end of the second current limiting unit is connected with the first end of the energy storage unit, and the second current limiting unit is used for limiting the current of the pre-charging signal; and/or
And the backflow preventing unit is connected between the pre-charging switch unit and the power supply and is used for preventing current at the input end of the voltage conversion circuit from flowing backwards to the power supply.
5. A slow start circuit as claimed in claim 2 or 3 wherein the energy storage unit comprises a first capacitor; the first voltage dividing unit comprises a first resistor;
the first end of the first resistor and the first end of the first capacitor are connected with the control end of the pre-charging switch unit, and the second end of the first resistor and the second end of the first capacitor are connected with the second end of the pre-charging switch unit.
6. The slow start circuit as claimed in claim 4, wherein the second current limiting unit comprises a second resistor and a first diode;
the first end of the second resistor is connected with the control end of the pre-charging switch unit, the second end of the second resistor is connected with the cathode of the first diode, and the anode of the first diode is connected with the control circuit.
7. A slow start circuit as claimed in any one of claims 1 to 3 wherein the main switching circuit comprises:
the main switch unit is arranged between the power supply and the voltage conversion circuit;
and the driving unit is connected with the control circuit and the main switch unit and is used for generating a switch control signal according to the main switch on signal so as to control the on or off of the main switch unit.
8. The slow start circuit of claim 7, wherein the main switch unit comprises: a relay, a second capacitor, and a third diode;
the first end of the contact group of the relay is connected with the power supply, the second end of the contact group of the relay is connected with the power supply, the first end of the coil of the relay and the anode of the third diode are commonly connected with the output end of the driving unit, the second end of the coil of the relay, the cathode of the third diode and the first end of the second capacitor are commonly connected with the power supply of the relay, and the second end of the second capacitor is grounded.
9. A power supply circuit, comprising: voltage conversion circuit and slow start circuit according to any one of claims 1-8.
10. An electronic device, comprising: the power supply circuit of claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223297203.0U CN219659582U (en) | 2022-12-06 | 2022-12-06 | Slow start circuit, power supply circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223297203.0U CN219659582U (en) | 2022-12-06 | 2022-12-06 | Slow start circuit, power supply circuit and electronic equipment |
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| CN219659582U true CN219659582U (en) | 2023-09-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117595461A (en) * | 2024-01-17 | 2024-02-23 | 天索（苏州）控制技术有限公司 | Power supply circuit |
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2022
- 2022-12-06 CN CN202223297203.0U patent/CN219659582U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117595461A (en) * | 2024-01-17 | 2024-02-23 | 天索（苏州）控制技术有限公司 | Power supply circuit |
| CN117595461B (en) * | 2024-01-17 | 2024-04-16 | 天索（苏州）控制技术有限公司 | Power supply circuit |
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Address after: 518000 Factory Building 401, Runheng Industrial Plant 1, Fuyuan Road, Zhancheng Community, Fuhai Street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Zhenghao Innovation Technology Co.,Ltd. Country or region after: China Address before: 518000, 1st Floor, Building E, Jiehe Industrial City, Shuitian Community, Shiyan Street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Zhenghao Innovation Technology Co.,Ltd. Country or region before: China |
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