CN217037048U - Circuit and electronic equipment are prevented restarting by outage - Google Patents
Circuit and electronic equipment are prevented restarting by outage Download PDFInfo
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- CN217037048U CN217037048U CN202220210288.5U CN202220210288U CN217037048U CN 217037048 U CN217037048 U CN 217037048U CN 202220210288 U CN202220210288 U CN 202220210288U CN 217037048 U CN217037048 U CN 217037048U
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Abstract
The utility model relates to the technical field of switching power supplies, in particular to a power-off and restart-prevention circuit and electronic equipment, wherein the power-off and restart-prevention circuit comprises: the power supply circuit comprises a booster circuit, a power supply circuit and a first control circuit; the circuit realizes that when the input power supply fails, the output voltage is repeatedly restarted according to the difference between the power-on power supply circuit starting voltage and the switching power supply power-down voltage, so that the circuit is not repeatedly restarted due to the slow power-down of the capacitor when the power supply fails, the circuit is simple, a control chip is not additionally arranged, the cost is saved, the user experience is effectively improved, and the problem that the use of a client is influenced due to the repeated restart of the power supply caused by the slow power-down of the input end is effectively solved.
Description
Technical Field
The utility model relates to the technical field of switching power supplies, in particular to a power-off restart-preventing circuit and electronic equipment.
Background
In the wind power pitch driver, because of the large input range, the auxiliary source of the pitch driver system mostly adopts a boosting power supply and a step-down power supply which are connected in series for use, the front-end boosting power supply is a primary power supply, the rear-end step-down power supply is a secondary power supply, when the input of the pitch driver system is powered off, the influence of an input capacitor in the primary power supply causes the slow power failure of the pitch driver system, when the input voltage is lower and exceeds the normal working range, the primary boosting circuit still can continue to work, but the output of the primary boosting circuit is unstable due to the exceeding of the design range, the secondary power supply stops working, so that the two power supplies can stop working, but because the input voltage does not disappear completely, in a certain limit, the residual input voltage can reestablish the power supply, the operation is repeated, the use of customers can be influenced, and the use experience of the customers is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a power-off restart-preventing circuit and electronic equipment, and aims to solve the technical problem that in the prior art, the power supply is repeatedly restarted due to slow power failure of an input end, so that the use of a client is influenced.
To achieve the above object, the present invention provides a power-off restart-preventing circuit, including: the power supply circuit comprises a booster circuit, a power supply circuit and a first control circuit; wherein, the first and the second end of the pipe are connected with each other,
the input end of the booster circuit is connected with an external power supply, the output end of the booster circuit is connected with the input end of the power supply circuit, the output end of the power supply circuit is connected with the input end of the first control circuit, and the output end of the first control circuit is connected with the control end of the booster circuit; wherein the content of the first and second substances,
the booster circuit is used for boosting the input power supply and boosting the input power supply to a first preset voltage interval to supply power to the second-stage power supply;
the input end of the power supply circuit is connected with the output end of the booster circuit, and the power supply circuit converts high voltage into a second preset voltage interval for supplying power to the first control circuit;
the first control circuit is used for receiving the power supply voltage output by the power supply circuit, taking the boosted voltage of the booster circuit as the feedback voltage, and controlling the operation of the booster circuit according to the power supply voltage and the feedback voltage.
Optionally, the power supply circuit comprises: the energy storage device comprises a first power supply circuit, a second power supply circuit and an energy storage unit, wherein the first power supply circuit is respectively connected with the output end of the booster circuit and the input end of the first control circuit, the control end of the first power supply circuit is connected with the anode of an external power supply, the second power supply circuit is respectively connected with the external power supply and the input end of the first control circuit, the first end of the energy storage unit is connected with the cathode of the external power supply, and the second end of the energy storage unit is respectively connected with the output end of the first power supply circuit and the output end of the second power supply circuit;
the first power supply circuit is used for generating a first power supply voltage when receiving the boosted voltage output by the booster circuit, and outputting the first power supply voltage to the energy storage unit for power supply;
the second power supply circuit is used for outputting power supply switching voltage to the first power supply circuit;
the second power supply circuit is also used for outputting a second power supply voltage to the energy storage unit for power supply;
the energy storage unit is used for charging according to a first power supply voltage of the first power supply circuit or a second power supply voltage of the second power supply circuit when receiving the first power supply voltage or the second power supply voltage;
the energy storage unit is also used for outputting starting voltage to supply power to the first control circuit.
Optionally, the first power supply circuit comprises: the device comprises a first resistor, a second resistor, a third resistor, a first diode, a second diode and an MOS (metal oxide semiconductor) tube;
the first end of the first resistor is connected with the positive electrode of an external power supply, the second end of the first resistor is connected with the grid electrode of the MOS tube, the first end of the second resistor is connected with the output end of the booster circuit, the second end of the second resistor is connected with the drain electrode of the MOS tube, the first end of the third resistor is connected with the grid electrode of the MOS tube, the second end of the third resistor is connected with the negative electrode of the external power supply, the cathode of the first diode is connected with the input end of the first control circuit, the anode of the first diode is connected with the source electrode of the MOS tube, the cathode of the second diode is connected with the grid electrode of the MOS tube, and the anode of the second diode is connected with the negative electrode of the external power supply.
Optionally, the second power supply circuit comprises: a first coil winding and a third diode;
the first end of the first coil winding is connected with the negative electrode of an external power supply, the second end of the first coil winding is connected with the anode of the third diode, and the cathode of the third diode is connected with the input end of the first control circuit.
Optionally, the energy storage unit comprises: a first capacitor;
the first end of the first capacitor is connected with the negative electrode of an external power supply, and the second end of the first capacitor is respectively connected with the cathode of the first diode, the cathode of the third diode and the input end of the first control circuit.
Optionally, the power supply circuit further comprises: the power supply switching circuit is respectively connected with the control end of the first power supply circuit and the output end of the second power supply circuit;
and the power supply switching circuit is used for receiving the power supply switching voltage output by the second power supply circuit and controlling the first power supply circuit to stop supplying power to the first control circuit according to the power supply switching voltage.
Optionally, the power supply switching circuit includes: the first triode, the fourth resistor, the fifth resistor and the fourth diode;
the base electrode of the first triode is connected with the first end of the fourth resistor and the first end of the fifth resistor respectively, the collector electrode of the first triode is connected with the grid electrode of the MOS tube, the emitter electrode of the first triode is connected with the second end of the fourth resistor and the anode of the fourth diode respectively, the second end of the fifth resistor is connected with the cathode of the third diode, and the cathode of the fourth diode is connected with the cathode of an external power supply.
Optionally, the boost circuit comprises: the first inductor, the fifth diode, the second capacitor and the first switch circuit K1;
the first end of the first inductor is connected with the anode of an external power supply, the second end of the first inductor is respectively connected with the anode of the fifth diode and the first end of the first switch circuit K1, the cathode of the fifth diode is connected with the first end of the second capacitor, and the second end of the second capacitor is respectively connected with the second end of the first switch circuit K1 and the cathode of the external power supply.
Optionally, the power-off restart prevention circuit further includes: the voltage reduction circuit and the second control circuit; the input end of the voltage reduction circuit is connected with the output end of the voltage boost circuit, the input end of the second control circuit is connected with the output end of the second power supply circuit, and the output end of the second control circuit is connected with the control end of the voltage reduction circuit.
In addition, in order to achieve the above object, the present invention further provides an electronic device, which is characterized in that the electronic device includes the power-off restart-prevention circuit.
The utility model provides a power-off restart-prevention circuit, which comprises: the power supply circuit comprises a booster circuit, a power supply circuit and a first control circuit; the input end of the booster circuit is connected with an external power supply, the output end of the booster circuit is connected with the input end of the power supply circuit, the output end of the power supply circuit is connected with the input end of a first control circuit, and the output end of the first control circuit is connected with the control end of the booster circuit; the booster circuit is used for boosting an input power supply and boosting the input power supply to a first preset voltage interval to supply power to the second-stage power supply; the input end of the power supply circuit is connected with the output end of the booster circuit, and the power supply circuit converts high voltage into a second preset voltage interval for supplying power to the first control circuit; the first control circuit is used for receiving the power supply voltage output by the power supply circuit, taking the boosted voltage of the booster circuit as the feedback voltage, and controlling the operation of the booster circuit according to the power supply voltage and the feedback voltage. The circuit realizes that when the input power supply fails, the output voltage is repeatedly restarted according to the difference between the power-on power supply circuit starting voltage and the switching power supply power-down voltage, so that the circuit is not repeatedly restarted due to the slow power-down of the capacitor when the power supply fails, the circuit is simple, a control chip is not additionally arranged, the cost is saved, the user experience is effectively improved, and the problem that the use of a client is influenced due to the repeated restart of the power supply caused by the slow power-down of the input end is effectively solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a power-off restart protection circuit according to a first embodiment of the present invention;
FIG. 2 is a circuit diagram of a power-off restart protection circuit according to a first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a power-off restart protection circuit according to a second embodiment of the present invention;
fig. 4 is a circuit diagram of a power-off restart protection circuit according to a second embodiment of the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit the utility model.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but must be based on the realization of the technical solutions by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the technical solutions should be considered that the combination does not exist, and the technical solutions are not within the protection scope of the present invention.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a power-off restart prevention circuit according to a first embodiment of the present invention; FIG. 2 is a circuit diagram of a power-off restart protection circuit according to a first embodiment of the present invention;
the utility model relates to a power-off restart-prevention circuit, which comprises: booster circuit 10, power supply circuit 20, and first control circuit 30.
The input end of the boost circuit 10 is connected with an external power supply, the output end of the boost circuit 10 is connected with the input end of the power supply circuit 20, the output end of the power supply circuit 20 is connected with the input end of the first control circuit 30, and the output end of the first control circuit 30 is connected with the control end of the boost circuit 1010.
It should be understood that the boost circuit 10 is configured to receive a voltage of an external power supply, where the external power supply may be obtained by converting a power supply of the wind turbine pitch drive, and may also be provided for converting other power supplies that may provide a driving system.
Understandably, in the wind power pitch drive, because the voltage input range is large, for example: the minimum voltage input range is 36V, and the minimum voltage input range is 850V; in order to ensure that the wind power pitch drive system can normally operate, two-stage power supplies are mostly adopted for an auxiliary source of the pitch drive system to be connected in series for use, when voltage with a lower numerical value is received, the front end of the circuit can be pre-boosted to serve as a one-stage power supply, the wind power pitch drive is started according to the boosted voltage after boosting is completed, if the voltage is high enough, boosting is not needed, the wind power pitch drive is directly started, the voltage of the rear end is reduced, and the rear end is recorded as the two-stage power supply.
The boost circuit 10 is configured to boost an input power supply, and boost the input power supply to a first preset voltage interval to supply power to a second stage power supply;
the input end of the power supply circuit 20 is connected to the output end of the boost circuit, and the input end of the power supply circuit converts high voltage into low voltage in a second preset voltage interval to supply power to the first control circuit 30.
The first control circuit 30 is configured to receive the power supply voltage output by the power supply circuit 20, and control the operation of the voltage boost circuit according to the power supply voltage.
It is easy to understand that the voltage boost circuit 10 is configured to boost the received voltage, the power supply circuit 20 is configured to charge according to the boosted voltage of the voltage boost circuit 10, and power the first control circuit 30, and the first control circuit 30 is configured to stabilize the boosted voltage generated by the voltage boost circuit 10 during operation, wherein the first preset voltage interval is greater than the preset second voltage interval.
In a specific implementation, after the voltage boosting circuit 10 receives the voltage of the external power supply, the voltage boosting circuit boosts the voltage through the inductance element to obtain a boosted voltage, and transmits the boosted voltage to the power supply circuit 20, and the power supply circuit 20 charges based on the boosted voltage to obtain a power supply voltage, and transmits the power supply voltage to the first control circuit 30 to implement the power supply operation of the first control circuit 30.
Based on the first embodiment of the power-off restart-preventing circuit of the present invention, a second embodiment of the power-off restart-preventing circuit of the present invention is proposed, and referring to fig. 3 and 4, fig. 3 is a schematic structural diagram of the second embodiment of the power-off restart-preventing circuit of the present invention; fig. 4 is a circuit diagram of a power-off restart protection circuit according to a second embodiment of the present invention.
In this embodiment, the voltage boosting circuit 10 includes: a first inductor L1, a fifth diode D5, a second capacitor C2 and a first switch circuit K1; first inductance L1's first end is connected with external power supply's positive pole, first inductance L1's second end respectively in fifth diode D5's positive pole and first switch circuit K1's first end is connected, fifth diode D5's negative pole with second electric capacity C2's first end is connected, second electric capacity C2's second end respectively with first switch circuit K1's second end is connected and external power supply's negative pole is connected.
It should be noted that, the first inductor L1 in the voltage boost circuit 10 is used to boost the voltage input by the external power supply, the fifth diode D5 is used to conduct the boosted voltage, and prevent the second capacitor C2 from powering down after the input is powered off to cause the current backflow to affect the first switch circuit K1, and the first switch circuit K1 is used to stabilize the boosted voltage, where the first switch circuit K1 may be a switch tube, and the on and off states of the switch tube may be controlled by the first control circuit, so as to achieve the purpose of stabilizing the voltage, in this embodiment, the first switch circuit K1 may be a switch gate and may be controlled by the driving circuit.
The power supply circuit 20 includes: first supply circuit 20, second supply circuit 20 and energy storage unit 204, first supply circuit 20 respectively with boost circuit 10's output and first control circuit 30's input is connected, the control end of first supply circuit 20 is connected with external power supply's positive pole, second supply circuit 20 respectively with external power supply and first control circuit 30 input is connected, the first end of energy storage unit 204 is connected with external power supply's negative pole, the second end of energy storage unit 204 respectively with first supply circuit 20's output and second supply circuit 20's output is connected.
It can be understood that, after receiving the boost voltage transmitted by the boost circuit 10, the input terminal of the power supply circuit 20, that is, the input terminal of the first power supply circuit 20 receives the boost voltage, and meanwhile, the external power supply is connected to the control terminal of the first power supply circuit 20 to turn on the first power supply circuit 20, so that the first power supply circuit 20 charges the energy storage unit 204, and when the energy storage unit 204 reaches the start voltage of the first control circuit 30, the first control circuit 30 is started.
The first power supply circuit 20 is configured to generate a first power supply voltage when receiving the boosted voltage output by the voltage boost circuit 10, and output the first power supply voltage to the energy storage unit 204 for power supply.
Further, the first power supply circuit 20 includes: a first resistor R1, a second resistor R2, a third resistor R3, a first diode D1, a second diode D2 and a MOS transistor Q1, wherein, a first end of the first resistor R1 is connected with an external power supply anode, a second end of the first resistor R1 is connected with the grid electrode of the MOS transistor Q1, a first end of the second resistor R2 is connected to the output end of the voltage boost circuit 10, a second end of the second resistor R2 is connected to the drain of the MOS transistor Q1, the first end of the third resistor R3 is connected with the grid of the MOS transistor Q1, the second end of the third resistor R3 is connected with the negative pole of an external power supply, the cathode of the first diode D1 is connected to an input of the first control circuit 30, the anode of the first diode D1 is connected with the source of the MOS transistor Q1, the cathode of the second diode D2 is connected with the gate of the MOS transistor Q1, and the anode of the second diode D2 is connected with the cathode of an external power supply.
It should be noted that, the second resistor R2 generates the first power supply voltage by receiving the boosted voltage transmitted by the voltage boosting circuit 10, that is, the first inductor L1, through the turned-on MOS transistor Q1, and sends the first power supply voltage to the energy storage unit 204 to charge the energy storage unit 204, and after the energy storage unit 204 reaches the starting voltage of the first control circuit 30, the first control circuit 30 is charged through the energy storage unit 204, so that the first control circuit 30 completes the operation.
It is easy to understand that the MOS transistor Q1 may be an NMOS transistor, in this embodiment, when a high level exists at the gate of the NMOS transistor Q1, the NMOS transistor Q1 may be turned on, and therefore, the external power source is connected to the gate of the MOS transistor Q1 through the second resistor R2 and the second diode D2, so that the gate of the MOS transistor Q1 obtains a high level, and a current may sequentially flow to the energy storage unit 204 through the first resistor R1, the turned-on NMOS transistor Q1 and the first diode D1, so that the energy storage unit 204 completes charging.
In addition, the first diode D1 is used to prevent the current from flowing in the reverse direction, since the first diode D1 can prevent the second supply voltage from flowing in the reverse direction into the NMOS transistor Q1 when the second supply circuit 20 outputs the second supply voltage.
In this embodiment, the first resistor R1 is directly connected to the positive electrode of the external power supply, so that it is avoided that the gate of the NMOS transistor Q1 in the first power supply circuit 20 is still in a high level state when the power is off, which causes the NMOS transistor Q1 to be still in a conducting state, and thus the circuit is restarted, which affects the use of the user.
It should be understood that in this embodiment, by adjusting the ratio of the first resistor R1 to the third resistor R3, the start-up voltage of the NMOS transistor Q1 is not consistent with the off-state voltage, and due to the voltage that is turned on again when the input is powered off for the first time, the second capacitor C2 in the slowly powered-down voltage boost circuit 10 cannot provide enough start-up voltage for the NMOS transistor Q1, for example: the starting voltage of the NMOS tube Q1 is 62V, and the situation that the output voltage is repeatedly restarted in the power failure process is prevented by utilizing the difference between the starting voltage of the first power supply circuit 20 and the power failure voltage of the second capacitor C2. When the input is powered down to below the second capacitor C2 power down voltage, the output cannot be voltage regulated and powered down, and the power supply will be re-established only when the input voltage reaches the turn-on voltage.
In a specific implementation, if the starting voltage of the first control circuit 30 is V1 and the starting voltage of the NMOS transistor Q1 is V2, by adjusting the resistance ratio of the first resistor R1 and the third resistor R3, the starting voltage Von of the power supply circuit 20 is greater than the capacitor power-down voltage Voff in the voltage boost circuit 10, and the starting voltage of the power supply circuit 20 may be specifically represented as:
Von＝(V1+Vd1+V2)*R4/R1
vd1 is the voltage of the first resistor R1.
The second power supply circuit 20 is configured to output a power supply switching voltage to the first power supply circuit 20;
the second power supply circuit 20 is further configured to output a second power supply voltage to the energy storage unit 204 for supplying power;
further, the second power supply circuit 20 includes: the first coil winding T1 and the third diode D3, wherein the first end of the first coil winding T1 is connected to the negative electrode of the external power supply, the second end of the first coil winding T1 is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the input terminal of the first control circuit 30.
It can be understood that, the external power supply charges the first coil winding T1, and after the charging is completed, the second power supply voltage is transmitted to the first control circuit 30 through the third diode D3, and at the same time, the output power supply switching circuit 203 will transmit the second power supply voltage to the first power supply circuit 20, so that the NMOS transistor Q1 in the first power supply circuit 20 is turned off, and the transmission of the first power supply voltage in the first power supply circuit 20 is cut off, so as to reduce the load consumption of the circuit.
The energy storage unit 204 is configured to perform charging according to a first supply voltage of the first supply circuit 20 or a second supply voltage of the second supply circuit 20 when receiving the first supply voltage or the second supply voltage;
the energy storage unit 204 is further configured to output a starting voltage to power the first control circuit 30.
Further, the energy storage unit 204 includes: a first capacitor C1, wherein a first end of the first capacitor C1 is connected to a negative electrode of an external power source, and a second end of the first capacitor C1 is connected to a cathode of the first diode D1, a cathode of the third diode D3, and an input end of the first control circuit 30.
It should be understood that the first capacitor C1 receives the first power supply voltage to be charged when the NMOS transistor Q1 in the first power supply circuit 20 is turned on, and outputs the start-up information to the first control circuit 30 to supply power to the first control circuit 30 when the voltage in the first capacitor C1 reaches the start-up voltage of the first control circuit 30, so as to operate the first control circuit 30.
When the second power supply circuit 20 outputs the power supply switching circuit 203 to the first power supply circuit 20, the output of the first power supply voltage from the first power supply circuit 20 is interrupted, and at this time, the first control circuit 30 is supplied with power by the second power supply voltage output from the second power supply circuit 20.
In order to cut off the first supply voltage of the first supply circuit 20 when the second supply circuit 20 is operating, the supply circuit 20 further comprises: the power supply switching circuit 203, the power supply switching circuit 203 is respectively connected with the control end of the first power supply circuit 20 and the output end of the second power supply circuit 20;
the power supply switching circuit 203 is configured to receive the power supply switching voltage output by the second power supply circuit 20, and control the first power supply circuit 20 to stop supplying power to the first control circuit 30 according to the power supply switching voltage.
Further, the power supply switching circuit 203 includes: the power supply comprises a first triode Q2, a fourth resistor R4, a fifth resistor R5 and a fourth diode D4, wherein the base of the first triode Q2 is respectively connected with the first end of the fourth resistor R4 and the first end of the fifth resistor R5, the collector of the first triode Q2 is connected with the gate of the MOS transistor Q1, the emitter of the first triode Q2 is respectively connected with the second end of the fourth resistor R4 and the anode of the fourth diode D4, the second end of the fifth resistor R5 is connected with the cathode of the third diode D3, and the cathode of the fourth diode D4 is connected with the cathode of the external power supply.
It is understood that when the second power supply circuit 20 transmits the power supply switching voltage, the base of the first transistor Q2 is in a high state, so that the first transistor Q2 is in a conducting state, and when the first transistor Q2 is conducting, and at this time the NMOS transistor Q1 is turned off, the first power supply circuit 20 stops transmitting the first power supply voltage.
The first control circuit 30 includes: first drive circuit, first feedback circuit and first control chip, first feedback circuit's input is connected with boost circuit 10's output, first feedback circuit's output with first control chip's input is connected, first control chip's output is connected with first drive circuit's input, first drive circuit's output is connected with boost circuit 10's first switch circuit K1.
It is easy to understand that the first control chip may be a UC2844 control chip, the UC2844 control chip needs to provide a supply current of 0.5mA to 1mA for stable operation, the first control chip generates a control voltage when receiving a feedback voltage of the feedback circuit, and sends the control voltage to the driving circuit, and the driving circuit controls the open/close state of the first switch circuit K1 in the voltage boost circuit 10 to implement voltage boost stability of the voltage boost circuit 10.
The power-off restart-prevention circuit further comprises: a voltage-reducing circuit 40 and a second control circuit 50; the input end of the voltage reducing circuit 40 is connected with the output end of the voltage boosting circuit 10, the input end of the second control circuit 50 is connected with the output end of the second power supply circuit 20, and the output end of the second control circuit 50 is connected with the control end of the voltage reducing circuit 40.
Further, the voltage-decreasing circuit 40 includes: the power supply comprises a second switch circuit K2, a third switch circuit K3, a transformer, a sixth diode D6 and a seventh diode D7, wherein the second switch circuit K2 is connected with a first end of a second capacitor C2, a first end of the transformer is connected with a second end of the second switch circuit K2 and a first end of the third switch circuit K3 respectively, a second end of the third switch circuit K3 is connected with the cathode of an external power supply, and a second end of the transformer is connected with the anode of the sixth diode D6 and the anode of the seventh diode D7 respectively.
It is easily understood that the transformer is used to step down a voltage to output a stable low voltage.
The second control circuit 50 includes: second drive circuit, second feedback circuit and second control chip, the input of second feedback circuit is connected with the output of step-down circuit 40, the output of second feedback circuit with the input of second control chip is connected, the output of second control chip is connected with second drive circuit's input, second drive circuit's output is connected with second switch circuit K2 and third switch circuit K3 of step-down circuit 40.
In addition, in order to achieve the above object, the present invention further provides an electronic device including the power-off restart prevention circuit as described above.
Since the electronic device adopts all technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and details are not repeated herein.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited in this respect.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, technical details that are not elaborated in this embodiment may be referred to a power-off restart prevention circuit provided in any embodiment of the present invention, and are not described herein again.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or system in which the element is included.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.
Claims (10)
1. A power-down restart prevention circuit, comprising: the power supply circuit comprises a booster circuit, a power supply circuit and a first control circuit; wherein the content of the first and second substances,
the input end of the booster circuit is connected with an external power supply, the output end of the booster circuit is connected with the input end of the power supply circuit, the output end of the power supply circuit is connected with the first input end of a first control circuit, the second input end of the first control circuit is connected with the output end of the booster circuit, and the output end of the first control circuit is connected with the control end of the booster circuit; wherein the content of the first and second substances,
the booster circuit is used for boosting the input power supply and boosting the input power supply to a first preset voltage interval to supply power to the second-stage power supply;
the input end of the power supply circuit is connected with the output end of the booster circuit, the power supply circuit converts high voltage into a second preset voltage interval for supplying power to the first control circuit, and the second preset voltage interval is smaller than the first preset voltage interval;
the first control circuit is used for receiving the power supply voltage output by the power supply circuit, taking the boosted voltage of the booster circuit as the feedback voltage, and controlling the operation of the booster circuit according to the power supply voltage and the feedback voltage.
2. The power-off restart prevention circuit of claim 1, wherein the power supply circuit comprises: the energy storage device comprises a first power supply circuit, a second power supply circuit and an energy storage unit, wherein the first power supply circuit is respectively connected with the output end of the booster circuit and the input end of the first control circuit, the control end of the first power supply circuit is connected with the anode of an external power supply, the second power supply circuit is respectively connected with the external power supply and the input end of the first control circuit, the first end of the energy storage unit is connected with the cathode of the external power supply, and the second end of the energy storage unit is respectively connected with the output end of the first power supply circuit and the output end of the second power supply circuit;
the first power supply circuit is used for generating a first power supply voltage when receiving the boosted voltage output by the booster circuit, and outputting the first power supply voltage to the energy storage unit for power supply;
the second power supply circuit is used for outputting power supply switching voltage to the first power supply circuit;
the second power supply circuit is also used for outputting a second power supply voltage to the energy storage unit for power supply;
the energy storage unit is used for charging according to a first power supply voltage of the first power supply circuit or a second power supply voltage of the second power supply circuit when receiving the first power supply voltage or the second power supply voltage;
the energy storage unit is also used for outputting starting voltage to supply power to the first control circuit.
3. The power-down restart-prevention circuit of claim 2 wherein said first power supply circuit comprises: the device comprises a first resistor, a second resistor, a third resistor, a first diode, a second diode and an MOS (metal oxide semiconductor) tube;
the first end of the first resistor is connected with the positive electrode of an external power supply, the second end of the first resistor is connected with the grid electrode of the MOS tube, the first end of the second resistor is connected with the output end of the booster circuit, the second end of the second resistor is connected with the drain electrode of the MOS tube, the first end of the third resistor is connected with the grid electrode of the MOS tube, the second end of the third resistor is connected with the negative electrode of the external power supply, the cathode of the first diode is connected with the input end of the first control circuit, the anode of the first diode is connected with the source electrode of the MOS tube, the cathode of the second diode is connected with the grid electrode of the MOS tube, and the anode of the second diode is connected with the negative electrode of the external power supply.
4. The power-down restart-prevention circuit of claim 3 wherein said second power supply circuit comprises: a first coil winding and a third diode;
the first end of the first coil winding is connected with the negative electrode of an external power supply, the second end of the first coil winding is connected with the anode of the third diode, and the cathode of the third diode is connected with the input end of the first control circuit.
5. The power-off restart prevention circuit according to claim 4, wherein the energy storage unit comprises: a first capacitor;
the first end of the first capacitor is connected with the negative electrode of an external power supply, and the second end of the first capacitor is respectively connected with the cathode of the first diode, the cathode of the third diode and the first control end management chip power supply.
6. The power-off restart prevention circuit of claim 5 wherein the power supply circuit further comprises: the power supply switching circuit is respectively connected with the control end of the first power supply circuit and the output end of the second power supply circuit;
the power supply switching circuit is used for receiving the power supply switching voltage output by the second power supply circuit and controlling the first power supply circuit to stop supplying power to the first control circuit according to the power supply switching voltage.
7. The power-off restart prevention circuit of claim 6, wherein the power supply switching circuit comprises: the first triode, the fourth resistor, the fifth resistor and the fourth diode;
the base electrode of the first triode is connected with the first end of the fourth resistor and the first end of the fifth resistor respectively, the collector electrode of the first triode is connected with the grid electrode of the MOS tube, the emitter electrode of the first triode is connected with the second end of the fourth resistor and the anode of the fourth diode respectively, the second end of the fifth resistor is connected with the cathode of the third diode, and the cathode of the fourth diode is connected with the cathode of the external power supply.
8. The power-off restart prevention circuit according to any one of claims 1 to 7, wherein the voltage boost circuit includes: a first inductor, a fifth diode, a second capacitor and a first switch circuit K1;
the first end of the first inductor is connected with the anode of an external power supply, the second end of the first inductor is respectively connected with the anode of the fifth diode and the first end of the first switch circuit K1, the cathode of the fifth diode is connected with the first end of the second capacitor, and the second end of the second capacitor is respectively connected with the second end of the first switch circuit K1 and the cathode of the external power supply.
9. The power-outage restart circuit of any one of claims 1 through 7, wherein the power-outage restart circuit further comprises: the voltage reduction circuit and the second control circuit; the input end of the voltage reduction circuit is connected with the output end of the voltage boost circuit, the input end of the second control circuit is connected with the output end of the second power supply circuit, and the output end of the second control circuit is connected with the control end of the voltage reduction circuit.
10. An electronic device, characterized in that it comprises a power-off restart-prevention circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220210288.5U CN217037048U (en) | 2022-01-25 | 2022-01-25 | Circuit and electronic equipment are prevented restarting by outage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220210288.5U CN217037048U (en) | 2022-01-25 | 2022-01-25 | Circuit and electronic equipment are prevented restarting by outage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217037048U true CN217037048U (en) | 2022-07-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220210288.5U Active CN217037048U (en) | 2022-01-25 | 2022-01-25 | Circuit and electronic equipment are prevented restarting by outage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217037048U (en) |
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2022
- 2022-01-25 CN CN202220210288.5U patent/CN217037048U/en active Active
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