CN217445257U - Power supply circuit, system and power consumption equipment - Google Patents
Power supply circuit, system and power consumption equipment Download PDFInfo
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- CN217445257U CN217445257U CN202221251239.2U CN202221251239U CN217445257U CN 217445257 U CN217445257 U CN 217445257U CN 202221251239 U CN202221251239 U CN 202221251239U CN 217445257 U CN217445257 U CN 217445257U
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Abstract
The application relates to a power supply circuit, a system and electric equipment, wherein an overvoltage protection circuit is arranged between a switching power supply device and a second primary winding, the overvoltage protection circuit can receive the voltage output by an external power supply in real time in the operation process, and when the voltage reaches a voltage protection threshold value, the overvoltage protection circuit can act to control the switching power supply device to stop working, so that overvoltage protection is realized. According to the scheme, the overvoltage protection circuit is arranged in the power supply circuit, when the input voltage reaches the voltage protection threshold value, the switching power supply device can be controlled to stop working, overvoltage protection on devices and loads of the power supply circuit is achieved, and the power supply circuit has high operation reliability.
Description
Technical Field
The present application relates to the field of power supply technologies, and in particular, to a power circuit, a system, and a power device.
Background
With the development of science and technology, various electronic products are used more and more widely in daily life, and when the electronic products are operated, power supply is inevitably needed through a power supply circuit, so that the requirements of the electronic products on a power grid are higher and higher.
However, in the operation process of the power grid, voltage fluctuation often occurs due to various reasons, so that the power supply voltage in the power supply circuit is suddenly increased, and further, the devices and loads of the power supply circuit are damaged. Therefore, the conventional power supply circuit has low operational reliability.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a power circuit, a system and an electric device for solving the problem of low operational reliability of the power circuit, so that the power circuit can interrupt power supply operation in time under the condition of over-high input voltage, thereby avoiding damage to devices and loads of the power circuit and improving the operational reliability of the power circuit.
A power supply circuit comprising: the overvoltage protection circuit comprises a switching power supply device, a first primary winding, a second primary winding, a secondary winding and an overvoltage protection circuit, wherein a first end of the second primary winding is connected with an external power supply, and a second end of the second primary winding is connected with the switching power supply device; the first end of the secondary winding and the second end of the secondary winding are respectively connected with a load; the first end of the first primary winding is connected with the switching power supply device, the overvoltage protection circuit is connected with the first end of the second primary winding, the overvoltage protection circuit is connected with the switching power supply device, and the second end of the first primary winding is grounded; the overvoltage protection circuit is used for controlling the switching power supply device to stop working when the voltage output by the external power supply reaches a voltage protection threshold value.
According to the power supply circuit, the overvoltage protection circuit is arranged between the switching power supply device and the second primary winding, the overvoltage protection circuit can receive the voltage output by an external power supply in real time in the operation process, and when the voltage reaches a voltage protection threshold value, the overvoltage protection circuit can act to control the switching power supply device to stop working, so that overvoltage protection is realized. According to the scheme, the overvoltage protection circuit is arranged in the power supply circuit, when the input voltage reaches the voltage protection threshold value, the switching power supply device can be controlled to stop working, overvoltage protection on devices and loads of the power supply circuit is achieved, and the power supply circuit has high operation reliability.
In some embodiments, the power supply circuit further comprises a first capacitor and a first diode, a cathode of the first diode is connected to the switching power supply device, a first end of the first capacitor and the overvoltage protection circuit, an anode of the first diode is connected to a first end of the first primary winding, and a second end of the first capacitor is connected to a second end of the first primary winding.
In some embodiments, the overvoltage protection circuit includes a voltage sampling circuit, a second diode, a switch protection circuit, and a switching device, the voltage sampling circuit is connected to the first end of the second primary winding, a cathode of the second diode is connected to the voltage sampling circuit, an anode of the second diode is connected to the switch protection circuit, the switch protection circuit is connected to the control end of the switching device, the first end of the switching device is connected to the switching power supply, and the voltage sampling circuit, the switch protection circuit, and the second end of the switching device are grounded.
In one embodiment, the voltage sampling circuit includes a first resistor and a second resistor, a first end of the first resistor is connected to a first end of the second primary winding, a second end of the first resistor is connected to a first end of the second resistor and a cathode of the second diode, and a second end of the second resistor is grounded.
In one embodiment, the switch protection circuit includes a third resistor and a second capacitor, an anode of the second diode is connected to a first terminal of the third resistor, a first terminal of the second capacitor and a control terminal of the switching device, and a second terminal of the third resistor and a second terminal of the second capacitor are grounded.
In one embodiment, the switching device is a metal oxide semiconductor field effect transistor, a transistor, or an insulated gate bipolar transistor.
In one embodiment, the switching device is an NPN transistor.
A power supply system comprises a rectification filter circuit and the power supply circuit, wherein the first end of the second primary winding is connected with an external power supply through the rectification filter circuit.
An electric device comprises the power supply system.
In one embodiment, the powered device is a dishwasher.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a power circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a power circuit according to another embodiment of the present application;
fig. 3 is a schematic diagram of an embodiment of an overvoltage protection circuit;
FIG. 4 is a schematic diagram of a power circuit according to another embodiment of the present application;
fig. 5 is a schematic structural diagram of a power supply system according to another embodiment of the present application.
Description of reference numerals: 11-switching power supply unit, 12-first primary winding, 13-second primary winding, 14-secondary winding, 15-overvoltage protection circuit, D1-first diode, C1-first capacitor, 151-voltage sampling circuit, D2-second diode, 152-switching protection circuit, Q-switching device, R1-first resistor, R2-second resistor, R3-third resistor, C2-second capacitor and 21-rectifying filter circuit.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Referring to fig. 1, a power circuit includes: the overvoltage protection circuit comprises a switching power supply device 11, a first primary winding 12, a second primary winding 13, a secondary winding 14 and an overvoltage protection circuit 15, wherein a first end of the second primary winding 13 is connected with an external power supply, and a second end of the second primary winding 13 is connected with the switching power supply device 11; the first end of the secondary winding 14 and the second end of the secondary winding 14 are respectively connected with a load; a first end of the first primary winding 12 is connected with the switching power supply device 11, a first end of the second primary winding 13 is connected with the overvoltage protection circuit 15, the overvoltage protection circuit 15 is connected with the switching power supply device 11, and a second end of the first primary winding 12 is grounded; the overvoltage protection circuit 15 is used for controlling the switching power supply device 11 to stop working when the voltage output by the external power supply reaches a voltage protection threshold value.
Specifically, the switching power supply device 11, that is, the switching power supply management device, may be a switching power supply management chip, and is a device for managing power supply of the system. The AC/DC power supply device converts AC into DC, and the power flow direction thereof may be bidirectional, and the power flow from the power supply to the load is called rectification, and the power flow from the load back to the power supply is called active inversion. The DC/DC power supply device converts a fixed DC voltage into a variable DC voltage, and is also called DC chopper. The power supply circuit provided in the present application may be applied to the AC/DC type switching power supply device 11, or may be applied to the DC/DC type switching power supply device 11, which is not limited thereto.
The first primary winding 12, the second primary winding 13 and the secondary winding 14 jointly form a rectifier transformer, the second end of the second primary winding 13 is specifically connected to the control end of the switching power supply device 11, the voltage output of the power supply circuit is controlled through the control end of the switching power supply device 11, the output voltage of an external power supply can be converted into the voltage with the proper magnitude through the control action of the switching power supply device 11, and the voltage is output to a load to supply power to the load. At the first primary winding 12, the electric energy can be converted to supply power to the switching power supply unit 11, that is, the first end of the first primary winding 12 is connected to the power supply end of the switching power supply unit 11.
The manner in which the overvoltage protection circuit 15 controls the switching power supply device 11 to stop operating when the voltage output by the external power supply reaches the voltage protection threshold is not exclusive. Since the switching power supply unit 11 needs a minimum operating voltage to support during operation, the switching power supply unit 11 will start operation only when the supply voltage of the switching power supply is greater than or equal to the minimum operating voltage, and will stop operation when the supply voltage is less than the minimum operating voltage. Therefore, in one embodiment, it is possible to connect the overvoltage protection circuit 15 to the power supply terminal of the switching power supply device 11 while the overvoltage protection circuit 15 is grounded. When the voltage output by the external power supply reaches the voltage protection threshold, the overvoltage protection circuit 15 can act to ground the power supply end of the switching power supply device 11 to reduce the power supply of the switching power supply device until the voltage is less than the minimum working voltage, and the switching power supply device 11 stops working, so that the power supply for the load is interrupted, and the load is protected.
In another embodiment, the overvoltage protection circuit 15 may be connected to an enable terminal of the switching power supply device 11, and when the voltage output by the external power supply reaches a voltage protection threshold, the overvoltage protection circuit 15 may operate to send a signal to the enable terminal to control the switching power supply device 11 to stop operating, so as to interrupt power transmission of the power supply circuit and protect the device and the load of the power supply circuit.
In order to facilitate understanding of the technical solution of the present application, the first end of the first primary winding 12 is connected to the power supply end of the switching power supply device 11, the overvoltage protection circuit 15 is also connected to the power supply end of the switching power supply device 11, and when the voltage output by the external power supply reaches the voltage protection threshold, the overvoltage protection circuit 15 pulls down the power supply voltage of the switching power supply device 11 by grounding the power supply end of the switching power supply device 11, so as to implement the control of stopping the operation of the switching power supply device 11.
Accordingly, the specific circuit configuration of the overvoltage protection circuit 15 is not exclusive, and any circuit may be used as long as it can operate itself to ground the switching power supply device 11 (specifically, ground the power supply port of the switching power supply device 11) and reduce the power supply voltage of the switching power supply device 11 until the power supply voltage falls below the minimum operating voltage to stop the operation when the voltage output from the external power supply reaches the voltage protection threshold.
It should be noted that the magnitude of the voltage protection threshold is not unique and may vary depending on the type of devices in the overvoltage protection circuit 15. Therefore, in one embodiment, when the overvoltage protection circuit 15 is built, different types of devices can be selected according to different withstand voltage values of actual loads, so that the voltage protection threshold of the finally built overvoltage protection circuit 15 meets the current load requirement.
In the power supply circuit, the overvoltage protection circuit 15 is arranged between the switching power supply device 11 and the second primary winding 13, and in the operation process, the overvoltage protection circuit 15 can receive the voltage output by the external power supply in real time, and when the voltage reaches a voltage protection threshold value, the overvoltage protection circuit 15 can act to control the switching power supply device 11 to stop working, so that overvoltage protection is realized. According to the scheme, the overvoltage protection circuit 15 is arranged in the power supply circuit, when the input voltage reaches the voltage protection threshold value, the switching power supply device 11 can be controlled to stop working, overvoltage protection of devices and loads of the power supply circuit is achieved, and the power supply circuit has high operation reliability.
Referring to fig. 2, in some embodiments, the power circuit further includes a first capacitor C1 and a first diode D1, a cathode of the first diode D1 is connected to the switching power supply device 11, a first end of the first capacitor C1 and the overvoltage protection circuit 15, an anode of the first diode D1 is connected to the first end of the first primary winding 12, and a second end of the first capacitor C1 is connected to the second end of the first primary winding 12.
Specifically, in this embodiment, a first diode D1 is further disposed at the first end of the first primary winding 12, wherein a cathode of the first diode D1 is connected to the first end of the first capacitor C1, the overvoltage protection circuit 15 and the switching power supply device 11, and the voltage backflow to the first primary winding 12 can be avoided by utilizing the unidirectional conduction characteristic of the first diode D1. Meanwhile, the first capacitor C1 is arranged for filtering, so that the operation reliability of the power supply circuit is effectively improved.
It is to be understood that the specific type of the first diode D1 is not exclusive, and in one embodiment, the type may be selected in combination with the switching power supply device 11 and the rectifier transformer surrounded by each winding, as long as the power circuit can be ensured to operate normally, and the voltage back-sinking can be suppressed.
Referring to fig. 3, in some embodiments, the overvoltage protection circuit 15 includes a voltage sampling circuit 151, a second diode D2, a switch protection circuit 152, and a switching device Q, the voltage sampling circuit 151 is connected to a first end (not shown) of the second primary winding 13, a cathode of the second diode D2 is connected to the voltage sampling circuit 151, an anode of the second diode D2 is connected to the switch protection circuit 152, the switch protection circuit is connected to a control end of the switching device Q, the first end of the switching device Q is connected to the switching power supply apparatus 11, and the voltage sampling circuit 151 and the switch protection circuit 152 are connected to ground and a second end of the switching device Q is grounded.
Specifically, the voltage sampling circuit 151 is configured to collect a voltage, i.e., an input voltage, transmitted to the second primary winding 13 by the external power source, and transmit the voltage to the switching protection circuit 152 and the switching device Q, so as to control the switching device Q. The switch protection circuit 152 can process the voltage collected and transmitted by the voltage sampling circuit 151 to the control end of the switching device Q, and ensure the safe and stable operation of the switching device Q. The second diode D2 has a voltage stabilizing function, i.e. is a zener diode, which uses the PN junction reverse breakdown state, and its current can vary in a large range and its voltage is basically constant, thereby playing a role of voltage stabilization. The cathode of the second diode D2 is connected to the second terminal of the first resistor, and when the output voltage of the external power supply reaches a certain value, the second diode D2 can be broken down in the reverse direction, so that the level signal is received at the switching device Q. And after the switching device Q receives the level signal, it is turned on under the action of the level signal, that is, the first terminal and the second terminal of the switching device Q are connected.
Since the first terminal of the switching device Q is connected to the power supply terminal of the switching power supply apparatus 11, and the second terminal of the switching device Q is grounded, the voltage of the power supply terminal of the switching power supply apparatus 11 will be pulled down, that is, the power supply of the switching power supply apparatus 11 is reduced. When the power supply of the switching power supply unit 11 decreases below the minimum operating voltage, the switching power supply unit 11 will stop operating. The switching power supply device 11 is used in a power supply circuit to manage the whole power supply, and after the power supply circuit stops operating, the corresponding power supply management operation is also interrupted, and at this time, the voltage output by the external alternating current power supply cannot be transmitted to the load, that is, the power supply of the load is stopped, so that the overvoltage protection of the load is realized.
It is to be understood that the specific type of the voltage sampling circuit 151 is not exclusive as long as it can transmit the voltage of the external power source to the switching protection circuit 152 and the switching device Q. For example, in an embodiment, referring to fig. 4, the voltage sampling circuit 151 includes a first resistor R1 and a second resistor R2, a first end of the first resistor R1 is connected to a first end of the second primary winding 13, a second end of the first resistor R1 is connected to a first end of the second resistor R2 and a cathode of the second diode D2, and a second end of the second resistor R2 is grounded.
Specifically, in the technical solution of this embodiment, the voltage sampling circuit 151 is implemented by voltage division sampling, and specifically includes two resistors, a common end of the two resistors is connected to a cathode of the second diode D2, so as to collect and apply an output voltage of an external power supply to a cathode of the second diode D2.
It should be noted that, in the voltage sampling circuit 151, the selection of the first resistor R1 and the second resistor R2 is not exclusive, since the power supply circuit provided in the present application is disposed on the primary winding side, the output voltage of the external power supply is generally high, and in order to ensure the operational reliability of the power supply circuit, the resistances of the first resistor R1 and the second resistor R2 need to be set to megaohms (1X 10) 6 Europe) level. At the same time, the accuracy of the selected resistor, i.e. the tolerance of the resistance of the resistor, should be less than or equal to 1% under the conditions of maximum electrical or mechanical fluctuationsThe lower the allowed error from the nominal value, the lower the accuracy of the chosen resistance, the higher the operational reliability of the power supply circuit.
According to the scheme, the voltage sampling circuit 151 is directly realized by simple partial pressure sampling, the number of required electronic components is small, the circuit volume can be effectively reduced, and the circuit cost can be saved.
In one embodiment, the regulated voltage value of the second diode D2 is:
V bulk to protect the threshold value for voltage, R 1 Is the resistance value of the first resistor R1, R 2 Is the resistance value, V, of the second resistor R2 ZD Is a steady voltage value.
Specifically, based on the voltage sampling circuit 151 in the voltage division mode, the voltage protection threshold of the power supply circuit can be adjusted to different magnitudes by selecting the type of the first resistor R1, the second resistor R2, and the second diode D2, that is, the voltage protection threshold includes:
V bulk ＝V ZD *R 1 /R 2 +V ZD
therefore, in the actual circuit setting process, the voltage protection threshold required by the current power supply circuit can be determined for different loads, and in the case of determining the voltage protection threshold, only the appropriate first resistor R1, the appropriate second resistor R2 and the appropriate second diode D2 need to be selected.
In order to facilitate the type selection of the electronic component, the first resistor R1 and the second resistor R2 may be selected first, and under the condition that the resistance values of the two resistors are not changed, the voltage output by the external power supply can reach the set voltage protection threshold value only by selecting the second diode D2 with a certain regulated voltage value, and the switching power supply device 11 may be grounded to stop working, so as to protect the load.
It is understood that in other embodiments, in the case of determining the voltage protection threshold, a fixed second diode D2 may be used, and the first resistor R1 and the second resistor R2 are type-selected, so that one of the resistance of the first resistor R1, the resistance of the second resistor R2, the regulated voltage of the second diode D2, and the voltage protection threshold is selectedIn a manner of satisfying the relationship V bulk ＝V ZD *R 1 /R 2 +V ZD And (4) finishing. Or, the first resistor R1, the second resistor R2 and the second diode D2 are simultaneously selected.
According to the scheme, the power circuit can have voltage protection thresholds with different sizes according to the parameters of the selected electronic components, so that the power circuit is suitable for different loads, and the application range of the power circuit is further improved.
The specific type of the switch protection circuit 152 is not exclusive, as long as it can ensure that the switching device Q can operate safely and stably when the second diode D2 is broken down in the reverse direction. Referring to fig. 4, in a more detailed embodiment, the switch protection circuit 152 includes a third resistor R3 and a second capacitor C2, an anode of a second diode D2 is connected to the first terminal of the third resistor R3, the first terminal of the second capacitor C2 and the control terminal of the switching device Q, and the second terminal of the third resistor R3 and the second terminal of the second capacitor C2 are grounded.
Specifically, in the solution of this embodiment, the third resistor R3 is used as a bias resistor, and through the function of this resistor, a current value with a proper magnitude can be provided for the switching device Q, and through adjusting the resistance value of this resistor, the current of the control terminal of the corresponding switching device Q can also be changed. Therefore, by setting the bias resistor with a proper size, it can be ensured that the switching device Q can provide a proper control end current when the voltage output by the external power supply reaches the voltage protection threshold value, so that the switching device Q can obtain a proper operating point. The second capacitor C2 plays a role in filtering, and the operational reliability of the switching device Q can be improved by the arrangement of the third resistor R3 and the second capacitor C2.
It should be noted that the specific type of the switching device Q selected in the overvoltage protection circuit 15 is not exclusive, and may be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOS Transistor), a Transistor, or an Insulated Gate Bipolar Transistor (IGBT), as long as when the second diode D2 is reverse-breakdown, the first terminal and the second terminal are conducted by the current transmitted to the control terminal, that is, the switching power supply device 11 (specifically, the power supply terminal) is grounded.
Further, in a more detailed embodiment, the switching device Q is an NPN transistor.
Specifically, the NPN transistor is a transistor formed by sandwiching a P-type semiconductor between two N-type semiconductors, and the transistor is formed by two PN junctions, one common electrode serving as a base of the transistor, and the other two electrodes being respectively referred to as a collector and an emitter. In this scheme, when the output voltage of the external power supply reaches the voltage protection threshold (i.e., is greater than or equal to the voltage protection threshold), the second diode D2 is reverse-broken. The breakdown current makes the base (i.e. the control terminal, referred to as "B-stage" for short) and the emitter (i.e. the first terminal, referred to as "E-stage" for short) of the NPN transistor turned on, and further the collector (i.e. the second terminal, referred to as "C-stage" for short) of the NPN transistor turned on, because the C-pole is connected to the low voltage (i.e. ground), the supply voltage of the switching power supply device 11 is forcibly reduced, and when the supply voltage is lower than the minimum operating voltage, the switching power supply device 11 stops operating, thereby playing a role in protecting the load. The NPN transistor is adopted in the embodiment, and the NPN transistor has the characteristics of long service life, safety, reliability, no mechanical wear, high switching speed, small size and the like, so that the operating efficiency and the service life of a power circuit are effectively improved.
A power supply system comprises a rectifying and filtering circuit 21 and the power supply circuit, wherein a first end of a second primary winding 13 is connected with an external power supply through the rectifying and filtering circuit 21.
Referring to fig. 5, in the solution of the embodiment, the external power source is an ac power source, for example, a 220V ac power source used currently, and before the ac power source is input into the power circuit, the ac power source is converted into dc power through the rectifying and filtering circuit 21, so as to implement the power supply operation. As shown in the foregoing embodiments and the accompanying drawings, the switching power supply device 11 needs to support a minimum operating voltage during operation, and only when the power supply voltage of the switching power supply is greater than or equal to the minimum operating voltage, the switching power supply device 11 will start operation, and when the power supply voltage is less than the minimum operating voltage, the switching power supply will be stopped, so as to interrupt power supply to the load and protect the load.
The first primary winding 12, the second primary winding 13 and the secondary winding 14 jointly form a rectifier transformer, and in combination with the switching power supply device 11, the power supply circuit provided by the application can convert the output voltage of an external power supply into a voltage with a proper size, so that the voltage is output to a load to supply power to the load.
When the overvoltage protection circuit 15 detects that the output voltage of the external power supply reaches the voltage protection threshold, the overvoltage protection circuit 15 acts to conduct the power supply end of the switching power supply device 11 and the ground, so that the power supply voltage of the switching power supply device 11 is reduced until the power supply voltage is smaller than the minimum working voltage. When the switching power supply stops working, the power supply operation from the external power supply to the load is correspondingly finished, so that the overvoltage protection of the load is realized, and the safe operation of the load is ensured.
In the power supply system, the overvoltage protection circuit 15 is arranged between the switching power supply device 11 and the second primary winding 13, and in the operation process, the overvoltage protection circuit 15 can receive the voltage output by the external power supply in real time, and when the voltage reaches a voltage protection threshold value, the overvoltage protection circuit 15 can act to control the switching power supply device 11 to stop working, so that overvoltage protection is realized. According to the scheme, the overvoltage protection circuit 15 is arranged in the power supply circuit, when the input voltage reaches the voltage protection threshold value, the switching power supply device 11 can be controlled to stop working, overvoltage protection of devices and loads of the power supply circuit is achieved, and the power supply circuit has high operation reliability.
An electric device comprises the power supply system.
Specifically, the power supply system is shown in the above embodiments and the drawings, and will not be described herein again. In the scheme, an overvoltage protection circuit 15 is arranged between the switching power supply device 11 and the second primary winding 13, in the operation process, the overvoltage protection circuit 15 can receive the voltage output by an external power supply in real time, and when the voltage reaches a voltage protection threshold value, the overvoltage protection circuit 15 can act to control the switching power supply device 11 to stop working, so that overvoltage protection is realized. According to the scheme, the overvoltage protection circuit 15 is arranged in the power supply circuit, when the input voltage reaches the voltage protection threshold value, the switching power supply device 11 can be controlled to stop working, overvoltage protection on devices and loads of the power supply circuit is achieved, and therefore the electric equipment is reliable in operation.
It should be noted that the specific type of the electric device is not exclusive, and any electric device may be used as long as the electric device includes the switching power supply unit 11, two primary windings, and one secondary winding 14 to perform the power supply operation. For example, in a more detailed embodiment, the powered device may be embodied as a dishwasher. In other embodiments, the electric equipment can also be an air conditioner, a range hood, an electric cooker or the like.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A power supply circuit, comprising:
a switching power supply device;
a first primary winding; the first end of the first primary winding is connected with the switching power supply device, and the second end of the first primary winding is grounded;
a first end of the second primary winding is connected with an external power supply, and a second end of the second primary winding is connected with the switching power supply device;
the first end of the secondary winding and the second end of the secondary winding are respectively connected with a load;
the overvoltage protection circuit is connected with the first end of the second primary winding and is connected with the switching power supply device; the overvoltage protection circuit is used for controlling the switch power supply device to stop working when the voltage output by the external power supply reaches a voltage protection threshold value.
2. The power supply circuit according to claim 1, further comprising a first capacitor and a first diode, wherein a cathode of the first diode is connected to the switching power supply device, a first terminal of the first capacitor, and the overvoltage protection circuit, an anode of the first diode is connected to a first terminal of the first primary winding, and a second terminal of the first capacitor is connected to a second terminal of the first primary winding.
3. The power supply circuit according to claim 1 or 2, wherein the overvoltage protection circuit comprises a voltage sampling circuit, a second diode, a switch protection circuit and a switching device, the voltage sampling circuit is connected to the first end of the second primary winding, the cathode of the second diode is connected to the voltage sampling circuit, the anode of the second diode is connected to the switch protection circuit, the switch protection circuit is connected to the control end of the switching device, the first end of the switching device is connected to the switching power supply apparatus, and the voltage sampling circuit, the switch protection circuit and the second end of the switching device are grounded.
4. The power circuit of claim 3, wherein the voltage sampling circuit comprises a first resistor and a second resistor, a first terminal of the first resistor is connected to the first terminal of the second primary winding, a second terminal of the first resistor is connected to the first terminal of the second resistor and the cathode of the second diode, and a second terminal of the second resistor is grounded.
5. The power supply circuit of claim 3, wherein the switch protection circuit comprises a third resistor and a second capacitor, wherein an anode of the second diode is connected to a first terminal of the third resistor, a first terminal of the second capacitor and a control terminal of the switching device, and a second terminal of the third resistor and a second terminal of the second capacitor are grounded.
6. The power supply circuit of claim 3, wherein the switching device is a metal oxide semiconductor field effect transistor, a transistor, or an insulated gate bipolar transistor.
7. A power supply circuit as claimed in claim 3, wherein the switching device is an NPN transistor.
8. A power supply system comprising a rectifier filter circuit and the power supply circuit of any one of claims 1 to 7, wherein the first end of the second primary winding is connected to an external power supply through the rectifier filter circuit.
9. An electric device characterized by comprising the power supply system of claim 8.
10. The consumer device according to claim 9, wherein the consumer device is a dishwasher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221251239.2U CN217445257U (en) | 2022-05-20 | 2022-05-20 | Power supply circuit, system and power consumption equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221251239.2U CN217445257U (en) | 2022-05-20 | 2022-05-20 | Power supply circuit, system and power consumption equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217445257U true CN217445257U (en) | 2022-09-16 |
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|---|---|---|---|
| CN202221251239.2U Active CN217445257U (en) | 2022-05-20 | 2022-05-20 | Power supply circuit, system and power consumption equipment |
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| Country | Link |
|---|---|
| CN (1) | CN217445257U (en) |
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2022
- 2022-05-20 CN CN202221251239.2U patent/CN217445257U/en active Active
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