CN216819703U - Power supply circuit and electronic device - Google Patents
Power supply circuit and electronic device Download PDFInfo
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- CN216819703U CN216819703U CN202123362916.6U CN202123362916U CN216819703U CN 216819703 U CN216819703 U CN 216819703U CN 202123362916 U CN202123362916 U CN 202123362916U CN 216819703 U CN216819703 U CN 216819703U
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Abstract
The application discloses power supply circuit and electronic equipment, power supply circuit include starting circuit and switching power supply circuit, and starting circuit is used for starting switching power supply circuit, and starting circuit includes switching circuit and power consumption circuit, wherein: the switching circuit is used for receiving a first voltage input by a first power supply, is connected when the ambient temperature is less than a preset temperature threshold value, provides a starting voltage to the switching power supply circuit through the power consumption circuit by the first voltage, and enables the switching power supply circuit to be started according to the starting voltage; the power consumption circuit is also used for consuming the electric energy flowing through the starting circuit after the switching power supply circuit is started; the switching circuit is also used for switching off when the ambient temperature is greater than or equal to a preset temperature threshold value so as to reduce the power loss of the starting circuit.
Description
Technical Field
The application relates to the technical field of power supplies, in particular to a power supply circuit and electronic equipment.
Background
Currently, a flyback switching power supply circuit generally has a starting resistor between an input terminal and a power supply pin (VCC), so that a starting voltage can be provided through the starting resistor. However, when a current continuously flows through the starting resistor, a certain loss is generated, and this loss continuously generates heat and reduces the operating efficiency of the entire circuit. In order to reduce the heat generated by the starting resistor, a heat dissipation device needs to be added to dissipate the heat of the starting resistor, thereby increasing the circuit cost.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a power supply circuit and an electronic device, which can reduce the power loss of a starting circuit for starting a switching power supply circuit and reduce the circuit cost.
A first aspect of an embodiment of the present application provides a power supply circuit, where the power supply circuit includes a starting circuit and a switching power supply circuit, the starting circuit is configured to start the switching power supply circuit, and the starting circuit includes a switching circuit and a power consumption circuit, where:
the input end of the switch circuit is used for connecting a first power supply, the output end of the switch circuit is used for connecting the input end of the power consumption circuit, and the output end of the power consumption circuit is used for connecting the power supply end of the switch power supply circuit;
the switching circuit is used for receiving a first voltage input by the first power supply, is connected when the ambient temperature is lower than a preset temperature threshold value, provides a starting voltage for the switching power supply circuit through the power consumption circuit by the first voltage, and enables the switching power supply circuit to be started according to the starting voltage; the power consumption circuit is also used for consuming the electric energy flowing through the starting circuit after the switching power supply circuit is started;
the switching circuit is also used for switching off when the ambient temperature is greater than or equal to a preset temperature threshold value.
Optionally, the switching circuit comprises a recoverable thermal fuse.
Optionally, the recoverable thermal fuse is a circuit breaker, the circuit breaker includes a bimetallic strip, a ceramic piece and a base elastic piece, a first end of the bimetallic strip is used as an input end of the switch circuit, and a first end of the base elastic piece is used as an output end of the switch circuit;
the bimetallic strip is in a first deformation state when the environment temperature is lower than a preset temperature threshold value, so that the second end of the bimetallic strip is connected with the first end of the base elastic sheet; when the bimetallic strip is in the first deformation state, the circuit breaker is in a communication state;
the bimetallic strip is in a second deformation state when the environmental temperature is greater than or equal to a preset temperature threshold value, so that a third end of the bimetallic strip is connected with a second end of the base elastic sheet through the ceramic sheet; and when the bimetallic strip is in the second deformation state, the circuit breaker is in a disconnection state.
Optionally, the starting circuit further includes a filter circuit, and the output terminal of the power consumption circuit is grounded through the filter circuit.
Optionally, the switching power supply circuit includes a voltage conversion circuit and a power supply control circuit;
the power supply end of the power supply control circuit is connected with the output end of the power consumption circuit; the driving end of the power supply control circuit is connected with the control end of the voltage conversion circuit; the input end of the voltage conversion circuit is used for being connected with a first power supply, and the output end of the voltage conversion circuit is connected with the power supply end of the power supply control circuit;
the power supply control circuit is used for starting after receiving the starting voltage and driving the voltage conversion circuit to work; the voltage conversion circuit is used for performing voltage conversion on a first voltage input by the first power supply so as to output a second voltage at an output end of the voltage conversion circuit.
Optionally, the voltage conversion circuit includes a multi-winding transformer, a switching unit and a first rectifying and voltage-stabilizing unit;
the multi-winding transformer comprises a first winding and a second winding, the first winding is used for being connected with the first power supply, the switch unit is connected with the first winding in series, and the power supply control circuit is used for driving the switch unit to be switched on or switched off so as to generate a third voltage on the first winding and couple the third voltage to the second winding to form an induced voltage;
and the first rectifying and voltage stabilizing unit is used for processing the induction voltage obtained by coupling the second winding into a second voltage and outputting the second voltage to the power supply end of the power supply control circuit.
Optionally, the voltage conversion circuit further includes a second rectifying and voltage stabilizing unit, the multi-winding transformer further includes a third winding, the third winding is connected in series with the second rectifying and voltage stabilizing unit, and the second rectifying and voltage stabilizing unit is configured to process an induced voltage obtained by coupling the third winding into a fourth voltage and output the fourth voltage.
Optionally, the voltage conversion circuit further includes a feedback unit, an input end of the feedback unit is connected to an output end of the second rectifying and voltage stabilizing unit, and an output end of the feedback unit is connected to a feedback control end of the power control circuit;
the feedback unit is used for outputting a feedback control signal to the power supply control circuit according to the fourth voltage output by the second rectifying and voltage stabilizing unit, and the power supply control circuit is used for driving the switch unit to be switched on or switched off according to the feedback control signal output by the feedback unit.
Optionally, the power control circuit includes a switching power supply chip, an output end of the feedback unit is connected to a comparison pin of the switching power supply chip, and the switching power supply chip adjusts a duty ratio of the switching unit according to an electrical signal input by the comparison pin.
A second aspect of the embodiments of the present application provides an electronic device, including the foregoing power supply circuit.
The embodiment of the application provides a power supply circuit and electronic equipment, wherein power supply circuit includes starting circuit and switching power supply circuit, and starting circuit is used for starting switching power supply circuit, and starting circuit includes switching circuit and power consumption circuit, wherein: the input end of the switching circuit is used for connecting a first power supply, the output end of the switching circuit is used for connecting the input end of the power consumption circuit, and the output end of the power consumption circuit is used for connecting the power supply end of the switching power supply circuit; the switching circuit is used for receiving a first voltage input by a first power supply, is connected when the ambient temperature is less than a preset temperature threshold value, provides a starting voltage to the switching power supply circuit through a power consumption circuit by the first voltage, and enables the switching power supply circuit to be started according to the starting voltage; the power consumption circuit is also used for consuming the electric energy flowing through the starting circuit after the switching power supply circuit is started; the switching circuit is also used for switching off when the ambient temperature is greater than or equal to a preset temperature threshold value, so that the power loss of the starting circuit can be reduced.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a power supply circuit provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of a power supply circuit in another embodiment;
figure 3a is a schematic diagram of a circuit breaker in one embodiment;
figure 3b is a schematic diagram of a circuit breaker in another embodiment;
FIG. 4 is a schematic diagram of a power supply circuit in another embodiment;
FIG. 5 is a schematic diagram of a power supply circuit in another embodiment;
FIG. 6 is a schematic diagram of a power supply circuit in yet another embodiment;
FIG. 7 is a schematic diagram of a power supply circuit in yet another embodiment;
fig. 8 is a schematic structural diagram of an electronic device provided in an embodiment of the present application.
Description of reference numerals:
10. a power supply circuit; 100. A start-up circuit; 110. A switching circuit;
111. a circuit breaker; 1111. A bimetal; 1112. A ceramic plate; 1113. A base spring plate;
120. a power dissipating circuit; 130. A filter circuit; 20. A first power supply;
200. a switching power supply circuit; 210. A power supply control circuit; 220. A voltage conversion circuit;
221. a multi-winding transformer; 222. A switch unit; 223. A first rectifying and voltage-stabilizing unit;
224. a second rectifying and voltage-stabilizing unit; 225. A feedback unit; 300. An electronic device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that, if not conflicted, the individual features of the embodiments of the present application can be combined with one another within the scope of protection of the present application. Additionally, while a division of functional blocks is made within a device diagram, with a logical order shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the division of blocks in the device diagram, or the order in the flowchart.
Referring to fig. 1, an embodiment of the present application provides a power circuit 10, where the power circuit 10 includes a start-up circuit 100 and a switching power circuit 200, and the start-up circuit 100 is used for starting the switching power circuit 200.
As shown in fig. 1, the start-up circuit 100 includes a switching circuit 110 and a power dissipating circuit 120. The input terminal of the switch circuit 110 is used for connecting the first power supply 20, the output terminal of the switch circuit 110 is used for connecting the input terminal of the power consumption circuit 120, and the output terminal of the power consumption circuit 120 is used for connecting the power supply terminal of the switch power supply circuit 200.
Specifically, the switch circuit 110 is configured to receive a first voltage input by the first power supply 20, and is turned on when the ambient temperature is less than a preset temperature threshold, and is turned off when the ambient temperature is greater than or equal to the preset temperature threshold.
It should be noted that the ambient temperature may be the ambient temperature around the switch circuit 110, and the switch circuit 110 can change the internal connection mode according to the ambient temperature, so as to control the circuit to be connected or disconnected; the ambient temperature may also be the ambient temperature around the power dissipating circuit 120. The ambient temperature of the switching circuit 110 or the ambient temperature of the power dissipation circuit 120 is the temperature of the operating circuit in which it is located. The switch circuit 110 itself may include a temperature sensitive element, so that when the temperature exceeds a preset temperature threshold, the temperature sensitive element changes its state to change the internal circuit connection of the switch circuit 110, thereby implementing on-off control of the switch circuit 110. In other embodiments, the switching circuit 110 may also include a switching unit and a temperature detection unit. The temperature detecting unit is used for detecting the temperature of the switching circuit 110 and outputting a corresponding signal to switch the switching unit when the temperature exceeds a preset temperature threshold. That is, the ambient temperature may be detected by a temperature detection unit, such as a temperature detector, and the switch unit is controlled to be turned on when the ambient temperature is less than a preset temperature threshold, and the switch unit is controlled to be turned off when the ambient temperature is greater than or equal to the preset temperature threshold, so as to implement the switch control of the switch circuit 110.
Specifically, when the switching circuit 110 is turned on, the first voltage input from the first power supply 20 supplies the start voltage to the switching power supply circuit 200 through the power consumption circuit 120, and causes the switching power supply circuit 200 to start according to the start voltage.
Illustratively, the switch circuit 110 is turned on and outputs the first voltage to the power consumption circuit 120 when the first power supply 20 is connected, and the power consumption circuit 120 outputs the start voltage to the power supply terminal of the switch power supply circuit 200 based on the first voltage, so that the switch power supply circuit 200 is started.
Specifically, the power consumption circuit 120 is further configured to consume the electric energy flowing through the start circuit 100 after the switching power supply circuit 200 is started; the power dissipation circuit 120 does not dissipate power after the switching circuit is turned off.
For example, after the switching power supply circuit 200 is started according to the starting voltage, the first voltage is continuously output to the switching power supply circuit 200 through the power consumption circuit 120, at this time, the power consumption circuit 120 consumes the electric energy flowing through the starting circuit 100, and the consumed electric energy is continuously converted into heat energy, which not only reduces the working efficiency of the whole circuit, but also needs to increase the heat dissipation cost. Based on this, the switch circuit 110 is turned off when the ambient temperature is greater than or equal to the preset temperature threshold, so as to turn off the branch where the power dissipation circuit 120 is located, thereby reducing the power loss of the start-up circuit 100, improving the efficiency of the whole circuit, and reducing the generation of heat.
In some embodiments, the power up circuit 100 is a linear power supply circuit. Illustratively, a linear power supply circuit refers to a circuit consisting entirely of linear elements, independent sources, or linearly controlled sources. The linear power supply circuit has the advantages of stable performance, no high-frequency ripple interference and the like.
In some embodiments, the switch circuit 110 includes a recoverable thermal fuse (resettable fuse). The recoverable thermal fuse is a circuit protection device with a polymerized positive temperature coefficient and is used for overcurrent protection.
For example, when the power circuit 10 is not started, the circuit is not started, the temperature of the switching circuit 110 is lower than the preset temperature threshold, the switching circuit 110 is in a conducting state, for example, the recoverable thermal fuse, and at this time, when the switching circuit 110 is connected to the first power source 20, the switching circuit 110 is conducted and outputs a first voltage to the recoverable thermal fuse, and the first voltage supplies current to the switching power circuit 200 through the recoverable thermal fuse, so that the temperature of the recoverable fuse is increased; when the temperature of the recoverable fuse reaches a preset temperature threshold, the recoverable fuse is switched to a protection state of a high-resistance state, namely, a disconnection state. When the temperature of the recoverable fuse is reduced, the recoverable fuse is recovered to be in a normal state, namely a conducting state.
In some embodiments, as shown in fig. 2, the switching Circuit 110 includes a Circuit Breaker 111, for example, the recoverable thermal fuse is the Circuit Breaker 111, and the Circuit Breaker 111 includes a Miniature Circuit Breaker (Miniature Circuit Breaker).
In some embodiments, as shown in fig. 3a and 3b, the circuit breaker 111 includes a bimetal 1111, a ceramic plate 1112, and a base spring 1113. The first end of the bimetal 1111 serves as an input end of the switch circuit 110, and the first end of the base spring 1113 serves as an output end of the switch circuit 110. The bimetallic strip 1111 comprises a first metal strip and a second metal strip, and the first metal strip and the second metal strip can deform according to a preset temperature threshold value, so that the bimetallic strip 1111 is in different deformation states.
When the environmental temperature is lower than a preset temperature threshold, the bimetallic strip 1111 is in a first deformation state, so that the second end of the bimetallic strip 1111 is connected with the first end of the base elastic sheet 1113; when the bimetal 1111 is in the first deformation state, the circuit breaker 111 is in a communication state. The bimetallic strip 1111 is in a second deformation state when the environmental temperature is greater than or equal to a preset temperature threshold value, so that the third end of the bimetallic strip 1111 is connected with the second end of the base elastic sheet 1113 through the ceramic sheet 1112; when the bimetal 1111 is in the second deformation state, the circuit breaker 111 is in an open state.
For example, as shown in fig. 3a, the circuit breaker 111 is in a connected state (ON state), and the bimetal 1111 is in a first deformation state, and current flows from the first end of the bimetal 1111 to the first end of the base spring 1113 through the second end of the bimetal 1111 and is output to the power consumption circuit 120 through the first end of the base spring 1113. The bimetal 1111 and the base spring 1113 may be made of copper alloy material with low impedance, so the impedance in the normal power-on state (connected state) may be controlled within several milliohms (mQ).
It should be noted that the bimetal 1111 deforms due to heat generated by ambient temperature and current, and when the temperature of the bimetal 1111 reaches a preset temperature threshold, the bimetal 1111 jumps. Ambient temperature surpasss and predetermines the temperature threshold, perhaps because of the electric current leads to generating heat and when surpassing the predetermined temperature threshold of control, bimetallic strip 1111 can hang down the song, lifts up the arm for bimetallic strip 1111's second end and base shell fragment 1113's first end disconnection contact, the current disconnection.
For example, as shown in fig. 3b, after the bimetal 1111 jumps, the circuit breaker 111 is in an Off state (Off state), and at this time, the bimetal 1111 is in the second deformation state, and the current flows in from the first end of the bimetal 1111, flows into the ceramic plate 1112 through the third end of the bimetal 1111, is output to the second end of the base elastic sheet 1113 contacting the ceramic plate 1112, and is output to the power consumption circuit 120 from the second end of the base elastic sheet 1113 through the first end of the base elastic sheet 1113.
It should be noted that the impedance of ceramic wafer 1112 through which the current flows may be about ten or several ohms, so that the current flowing through ceramic wafer 1112 may be very weak, and the weak current may cause ceramic wafer 1112 to be in a slightly hot state, thereby keeping bimetal 1111 in an open circuit state. The circuit is kept in an open state until the temperature of the circuit is reduced to a preset temperature threshold.
In some embodiments, as shown in fig. 2 and 4, the power dissipation circuit 120 includes a starting resistor R7, and the starting resistor R7 is used for outputting a starting voltage to the power supply terminal of the switching power supply circuit 200; after the switching power supply circuit 200 is started, a current continuously flows through the starting resistor R7, so that a power loss is generated; after the switching circuit 110 is turned off, the current stops flowing through the starting resistor R7, thereby achieving the effect of reducing the power loss.
For example, as shown in fig. 4, when the ambient temperature is greater than or equal to the preset temperature threshold, the circuit breaker 111 is turned off, the first voltage Vin input by the first power supply 20 stops supplying power to the switching power supply circuit 200, and the power consumption circuit 120 does not consume power.
In some embodiments, as shown in fig. 4, the switch circuit 110 further includes a filter circuit 130, through which the output of the power dissipation circuit 120 is grounded. The filtering unit 130 may filter the voltage output by the output terminal of the power consumption circuit 120, so that the quality of the voltage output to the switching power supply circuit 200 is higher, and the switching power supply circuit 200 is ensured to be normally started and operated.
Illustratively, as shown in fig. 4, the filter circuit 130 includes a capacitor C7 and a capacitor C8, one end of the capacitor C7 is connected to the power supply end of the switching power supply circuit 200, the other end of the capacitor C7 is connected to the EP1, and the capacitor C8 is connected in parallel to the capacitor C7.
In some embodiments, as shown in fig. 5, the switching power supply circuit 200 includes a power supply control circuit 210 and a voltage conversion circuit 220. Wherein, the power supply terminal of the power control circuit 210 is connected to the output terminal of the power consumption circuit 120; the driving end of the power control circuit 210 is connected with the control end of the voltage conversion circuit 220; the input terminal of the voltage conversion circuit 220 is used for connecting with a first power supply, and the output terminal of the voltage conversion circuit 220 is connected with the power supply terminal of the power supply control circuit 210.
Specifically, the power control circuit 210 is configured to start after receiving a start voltage output by the power consumption circuit 120 via the first voltage, so as to drive the voltage conversion circuit 220 to operate; the voltage conversion circuit 220 is configured to perform voltage conversion on the first voltage input by the first power supply 20, so as to output a second voltage at an output terminal of the voltage conversion circuit 220.
It should be noted that, when the switch circuit 110 is connected to the first power supply 20, the first voltage is turned on and output to the power consumption circuit 120, and the power consumption circuit 120 provides the starting voltage to the power supply terminal of the power control circuit 210 based on the flowing first voltage, so as to start the power control circuit 210, and enable the power control circuit 210 to control the voltage conversion circuit 220 to start operating, and the output terminal of the voltage conversion circuit 220 outputs the second voltage to rise. Since the output terminal of the voltage converting circuit 220 is connected to the power supply terminal of the power control circuit 210, when the second voltage is greater than the first voltage, the power supply voltage of the power control circuit 210 is provided by the second voltage, thereby reducing the power consumption of the power consuming circuit 120, improving the efficiency of the whole circuit, and reducing the generation of heat.
In one embodiment, as shown in fig. 6, the voltage converting circuit 220 includes a multi-winding transformer 221, a switching unit 222, and a first rectifying and voltage stabilizing unit 223. The multi-winding transformer 221 includes a first winding and a second winding, the first winding is used for connecting with a first power supply, the switching unit 222 is connected in series with the first winding, and the power control circuit 210 is used for driving the switching unit 222 to be turned on or off to generate a third voltage on the first winding and couple the third voltage to the second winding to form an induced voltage; the first rectifying and voltage stabilizing unit 223 is configured to process the induced voltage obtained by coupling the second winding into a second voltage VDD and output the second voltage VDD to the power supply terminal of the power control circuit 210.
Illustratively, the first rectifying and voltage stabilizing unit 223 is configured to process the induced voltage obtained by coupling the second winding into a second voltage VDD and output the second voltage VDD to the power supply terminal of the power control circuit 210, when the second voltage VDD is greater than the first voltage Vin, the power supply voltage of the power control circuit 210 is provided by the second voltage VDD, and the second voltage VDD is used as the power supply voltage VCC of the power control circuit 210.
In an embodiment, as shown in fig. 6, the voltage converting circuit 220 further includes a second rectifying and voltage stabilizing unit 224, the multi-winding transformer 221 further includes a third winding, the third winding is connected in series with the second rectifying and voltage stabilizing unit 224, and the second rectifying and voltage stabilizing unit 224 is configured to process the induced voltage obtained by coupling the third winding into a fourth voltage and output the fourth voltage.
Illustratively, the multi-winding transformer 221 includes at least a first winding, a second winding, and a third winding. The first winding is used for being connected with a first power supply 20 and receiving a first voltage Vin output by the first power supply 20; the switching unit 222 is connected in series with the first winding, the power control circuit 210 is configured to drive the switching unit 222 to turn on or off to generate a third voltage at the first winding and couple the third voltage to the second winding and the third winding to form an induced voltage, the first rectifying and voltage stabilizing unit 223 processes the induced voltage coupled to the second winding into a second voltage VDD, and the second rectifying and voltage stabilizing unit 224 processes the induced voltage coupled to the third winding into a fourth voltage Vo.
Illustratively, as shown in fig. 6, the voltage converting circuit 220 includes a multi-winding transformer 221, a switching unit 222, a first rectifying and voltage stabilizing unit 223, and a second rectifying and voltage stabilizing unit 224. The switching unit 222 includes a switching element Q2 and a voltage divider circuit; the switching element Q2 is, for example, an NMOS transistor, the voltage divider circuit includes, for example, a resistor R11 and a resistor R13, a first end of the resistor R11 serves as a first end of the voltage divider circuit, a second end of the resistor R11 is connected to a first end of the resistor R13, a second end of the resistor R13 serves as a second end of the voltage divider circuit, and a second end of the resistor R11 serves as a voltage divider end of the voltage divider circuit; the first end of the voltage divider circuit is connected to the driving end of the power control circuit 210, the second end of the voltage divider circuit is connected to the second end of the switching element Q2, such as the source of the NMOS transistor, and the voltage divider end of the voltage divider circuit is connected to the control end of the switching element Q2, such as the gate of the NMOS transistor. A first terminal of the switching element Q2, for example, the drain of the NMOS transistor, is connected to the multi-winding transformer 221.
For example, when the first rectifying and voltage stabilizing unit 223 outputs the second voltage VDD to the power control circuit 210, the power control circuit 210 may drive the voltage converting circuit 220 to operate. When the first winding generates the third voltage, which is coupled to the second winding and the third winding to form the induced voltage, the second voltage VDD output by the first rectifying and voltage stabilizing unit 223 has the same trend with the fourth voltage Vo output by the second rectifying and voltage stabilizing unit 224, i.e., when the first rectifying and voltage stabilizing unit 223 outputs the second voltage VDD to the power control circuit 210 to increase, the fourth voltage Vo output by the second rectifying and voltage stabilizing unit 224 also increases.
For example, when the second voltage VDD is greater than the first voltage Vin, the power supply voltage of the power control circuit 210 is provided by the second voltage, and the power at the starting resistor R7 is:
P＝(Vin-VDD-0.7V)2/R7。
the starting resistor R7 continuously generates power consumption, and continuously generates heat to cause the ambient temperature to rise, when the ambient temperature rises to the temperature protection point of the circuit breaker 111, the circuit breaker 111 is internally broken, a loop between the first voltage Vin and the starting resistor R7 is cut off, no power consumption is generated by the starting resistor R7, the ambient temperature starts to be reduced, when the ambient temperature is reduced to the recovery temperature point of the circuit breaker 111, the circuit breaker 111 is closed and conducted again, the loop between the first voltage Vin and the starting resistor R7 is connected, the starting resistor R7 consumes the electric energy flowing through the starting circuit 100, the ambient temperature starts to rise, and the steps are repeated, so that the temperature of the starting resistor R7 is limited between the temperature protection point and the recovery temperature point of the circuit breaker 111, the circuit cost can be reduced, and the circuit working efficiency is improved.
In some embodiments, referring to fig. 7, the voltage converting circuit 220 further includes a feedback unit 225, an input terminal of the feedback unit 225 is connected to the output terminal of the second rectifying and voltage stabilizing unit 224, and an output terminal of the feedback unit 225 is connected to the feedback control terminal of the power control circuit 210.
Specifically, the feedback unit 225 is configured to output a feedback control signal to the power control circuit 210 according to the fourth voltage output by the second rectifying and voltage stabilizing unit 224, and the power control circuit 210 is configured to drive the switching unit 222 to be turned on or off according to the feedback control signal output by the feedback unit 225, so as to generate a stable third voltage at the first winding, and couple the third voltage to the second winding and the third winding to form a stable induced voltage, so that the first rectifying and voltage stabilizing unit 223 and the second rectifying and voltage stabilizing unit 224 can output the stable voltage.
For example, as shown in fig. 7, an input end of the feedback unit 225 receives the fourth voltage Vo output by the output end of the second rectifying and voltage stabilizing unit 224, and an output end of the feedback unit 225 is connected to a comparison pin COMPN of a switching power chip U2 in the power control circuit 210. Illustratively, the first rectifying and voltage stabilizing unit 223 is configured to process the induced voltage coupled by the second winding into the second voltage VDD and output the second voltage VDD to the power supply terminal of the power control circuit 210, and the second rectifying and voltage stabilizing unit 224 is configured to process the induced voltage coupled by the third winding into the fourth voltage Vo and output the fourth voltage Vo to the input terminal of the feedback circuit 225.
In some embodiments, referring to fig. 7, the power control circuit 210 includes a switching power chip U2, an output terminal of the feedback unit 225 is connected to a comparison pin COMPN of the switching power chip, and the switching power chip adjusts a duty ratio of the switching unit 222 according to an electrical signal input by the comparison pin COMPN, so as to drive the switching unit 222 to turn on or off to adjust the third voltage generated by the first winding. It should be noted that the comparison pin COMPN is used for comparing the output voltage of the feedback unit 225 with the reference voltage to obtain a comparison result, and then performing switching control on the switching unit 222 according to the comparison result, so that the third voltage generated by the first winding is in accordance with an expectation, and finally, the fourth voltage Vo output by the output end of the second rectifying and voltage stabilizing unit 224 is ensured.
For example, referring to fig. 6 and 7, the power control circuit 210 includes a switching power chip U2 and its peripheral circuits, a VCC pin of the switching power chip U2 is used as a power supply terminal of the power control circuit 210, and an OUT pin is used as a driving terminal of the power control circuit 210 and is connected to a control terminal of the voltage conversion circuit 220.
The embodiment of the application provides a power supply circuit 10, the power supply circuit 10 includes a starting circuit 100 and a switching power supply circuit 200, the starting circuit 100 is used for starting the switching power supply circuit 200, and the starting circuit 100 includes a switching circuit 110 and a power consumption circuit 120. Wherein: the input end of the switch circuit 110 is used for connecting a first power supply, the output end of the switch circuit 110 is used for connecting the input end of the power consumption circuit 120, and the output end of the power consumption circuit 120 is used for connecting the power supply end of the switch power supply circuit 200; the switching circuit 110 is configured to receive a first voltage input by the first power supply, and connect when the ambient temperature is less than a preset temperature threshold, provide a start voltage to the switching power supply circuit 200 through the power consumption circuit 120 by using the first voltage, and enable the switching power supply circuit 200 to start according to the start voltage; the power consumption circuit 120 is further configured to consume the power flowing through the start-up circuit 100 after the switching power supply circuit 200 is started up; the switch circuit 110 is further configured to be turned off when the ambient temperature is greater than or equal to the predetermined temperature threshold, which can reduce the power consumption of the start-up circuit 100, improve the efficiency of the whole circuit, reduce the circuit cost, and reduce the generation of heat.
Referring to fig. 8 in conjunction with the foregoing embodiments, fig. 8 is a schematic block diagram of an electronic device 300 according to an embodiment of the present application.
As shown in fig. 8, the electronic device 300 includes the aforementioned power circuit 10, the power circuit 10 can be connected to a first power source 20, and the first power source 20 can provide power to the power circuit 10; for example, the electronic device 300 may or may not include the first power source 20.
For example, the electronic device 300 may be a power supply device, and the first power source 20 connected to the power supply circuit 10 may be a power supply externally connected to the power supply device, or may be a power supply of the power supply device.
For example, the first power source 20 may be a rechargeable battery or a non-rechargeable battery, or the first power source 20 may also be an external power source, such as a power grid, a generator, an energy storage device connected to the electronic device 300, a solar battery, etc., and provide the power to the power circuit 10 after performing ac/dc conversion, voltage stabilization, etc.
Illustratively, when the first power supply 20 detects a trigger operation to supply power to the power supply circuit 10, the trigger operation may be an operation in which a user presses a button. In another embodiment, the first power source 20 includes a power interface, and the first power source 20 supplies power to the power circuit 10 from an external power source when connected to the external power source, which may be an onboard charger, a solar panel, or mains electricity.
Illustratively, when the first power supply 20 supplies power to the power supply circuit 10, the power is supplied to the switching circuit 110 in the starting circuit 100, the power consumption circuit 120 and the voltage conversion circuit 220 in the switching power supply circuit 200; the switch circuit 110 is turned on and the first voltage flows to the power supply terminal of the power control circuit 210 through the power consumption circuit 120, so as to start the power control circuit 210, and the power control circuit 210 can drive the voltage conversion circuit 220 to operate; when the voltage conversion circuit 220 works, it converts the first voltage output by the first power supply 20, and outputs the second voltage to the power supply terminal of the power supply control circuit 210; the power control circuit 210 can drive the voltage conversion circuit 220 to operate under the action of the second voltage instead of the first voltage. The switching circuit 110 is turned off when the ambient temperature is greater than or equal to the preset temperature threshold, so as to prevent the power consumption circuit 120 from consuming the electric energy flowing through the starting circuit 100 after the switching power supply circuit 200 is started, thereby reducing the power consumption of the switching circuit 110, improving the efficiency of the whole circuit, and reducing the generation of heat.
The embodiment of the application provides an electronic device, the electronic device includes the foregoing power supply circuit, wherein the power supply circuit includes a starting circuit 100 and a switching power supply circuit 200, the starting circuit 100 is configured to start the switching power supply circuit 200, the starting circuit 100 includes a switching circuit 110 and a power consumption circuit 120, the switching circuit 110 is configured to receive a first voltage input by a first power supply, and communicate when an ambient temperature is less than a preset temperature threshold, provide a starting voltage to the switching power supply circuit 200 through the power consumption circuit 120 with the first voltage, and enable the switching power supply circuit 200 to start according to the starting voltage; the power consumption circuit 120 is further configured to consume the power flowing through the start-up circuit 100 after the switching power supply circuit 200 is started up; the switch circuit 110 is further configured to be turned off when the ambient temperature is greater than or equal to the preset temperature threshold, so that power loss of the electronic device can be reduced, the working efficiency of the whole electronic device can be improved, and the heat reduction cost of the electronic device can be reduced.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It should also be understood that the term "and/or" as used in this application and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention, and these modifications or substitutions are intended to be included in the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A power supply circuit comprising a startup circuit for starting up a switching power supply circuit, and a switching power supply circuit, the startup circuit comprising a switching circuit and a power dissipation circuit, wherein:
the input end of the switch circuit is used for connecting a first power supply, the output end of the switch circuit is used for connecting the input end of the power consumption circuit, and the output end of the power consumption circuit is used for connecting the power supply end of the switch power supply circuit;
the switching circuit is used for receiving a first voltage input by the first power supply, is connected when the ambient temperature is lower than a preset temperature threshold value, provides a starting voltage for the switching power supply circuit through the power consumption circuit by the first voltage, and enables the switching power supply circuit to be started according to the starting voltage; the power consumption circuit is also used for consuming the electric energy flowing through the starting circuit after the switching power supply circuit is started;
the switching circuit is also used for switching off when the ambient temperature is greater than or equal to a preset temperature threshold value.
2. The power supply circuit of claim 1, wherein the switching circuit comprises a recoverable thermal fuse.
3. The power supply circuit according to claim 2, wherein the recoverable thermal fuse is a circuit breaker, the circuit breaker comprises a bimetallic strip, a ceramic strip and a base spring strip, a first end of the bimetallic strip is used as an input end of the switch circuit, and a first end of the base spring strip is used as an output end of the switch circuit;
the bimetallic strip is in a first deformation state when the environment temperature is lower than a preset temperature threshold value, so that the second end of the bimetallic strip is connected with the first end of the base elastic sheet; when the bimetallic strip is in the first deformation state, the circuit breaker is in a communication state;
the bimetallic strip is in a second deformation state when the environmental temperature is greater than or equal to a preset temperature threshold value, so that a third end of the bimetallic strip is connected with a second end of the base elastic sheet through the ceramic sheet; and when the bimetallic strip is in the second deformation state, the circuit breaker is in a disconnection state.
4. The power supply circuit of claim 1, wherein the start-up circuit further comprises a filter circuit, and wherein the output of the power dissipation circuit is coupled to ground through the filter circuit.
5. The power supply circuit according to any one of claims 1 to 4, wherein the switching power supply circuit includes a voltage conversion circuit and a power supply control circuit;
the power supply end of the power supply control circuit is connected with the output end of the power consumption circuit; the driving end of the power supply control circuit is connected with the control end of the voltage conversion circuit; the input end of the voltage conversion circuit is used for being connected with a first power supply, and the output end of the voltage conversion circuit is connected with the power supply end of the power supply control circuit;
the power supply control circuit is used for starting after receiving the starting voltage and driving the voltage conversion circuit to work; the voltage conversion circuit is used for performing voltage conversion on a first voltage input by the first power supply so as to output a second voltage at an output end of the voltage conversion circuit.
6. The power supply circuit according to claim 5, wherein the voltage conversion circuit comprises a multi-winding transformer, a switching unit and a first rectifying and voltage stabilizing unit;
the multi-winding transformer comprises a first winding and a second winding, the first winding is used for being connected with the first power supply, the switch unit is connected with the first winding in series, and the power supply control circuit is used for driving the switch unit to be switched on or switched off so as to generate a third voltage on the first winding and couple the third voltage to the second winding to form an induced voltage;
and the first rectifying and voltage stabilizing unit is used for processing the induction voltage obtained by coupling the second winding into a second voltage and outputting the second voltage to the power supply end of the power supply control circuit.
7. The power supply circuit according to claim 6, wherein the voltage converting circuit further comprises a second rectifying and voltage stabilizing unit, the multi-winding transformer further comprises a third winding, the third winding is connected in series with the second rectifying and voltage stabilizing unit, and the second rectifying and voltage stabilizing unit is configured to process an induced voltage obtained by coupling the third winding into a fourth voltage and output the fourth voltage.
8. The power supply circuit according to claim 7, wherein the voltage converting circuit further comprises a feedback unit, an input terminal of the feedback unit is connected to the output terminal of the second rectifying and voltage stabilizing unit, and an output terminal of the feedback unit is connected to the feedback control terminal of the power supply control circuit;
the feedback unit is used for outputting a feedback control signal to the power supply control circuit according to the fourth voltage output by the second rectifying and voltage stabilizing unit, and the power supply control circuit is used for driving the switch unit to be switched on or switched off according to the feedback control signal output by the feedback unit.
9. The power supply circuit according to claim 8, wherein the power supply control circuit comprises a switching power supply chip, an output terminal of the feedback unit is connected to a comparison pin of the switching power supply chip, and the switching power supply chip adjusts a duty ratio of the switching unit according to an electrical signal input by the comparison pin.
10. An electronic device, characterized in that it comprises a power supply circuit according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123362916.6U CN216819703U (en) | 2021-12-28 | 2021-12-28 | Power supply circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123362916.6U CN216819703U (en) | 2021-12-28 | 2021-12-28 | Power supply circuit and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216819703U true CN216819703U (en) | 2022-06-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123362916.6U Active CN216819703U (en) | 2021-12-28 | 2021-12-28 | Power supply circuit and electronic device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216819703U (en) |
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2021
- 2021-12-28 CN CN202123362916.6U patent/CN216819703U/en active Active
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