CN112398464A - Power supply circuit and switching device - Google Patents
Power supply circuit and switching device Download PDFInfo
- Publication number
- CN112398464A CN112398464A CN202011286900.9A CN202011286900A CN112398464A CN 112398464 A CN112398464 A CN 112398464A CN 202011286900 A CN202011286900 A CN 202011286900A CN 112398464 A CN112398464 A CN 112398464A
- Authority
- CN
- China
- Prior art keywords
- circuit
- switch
- power supply
- coil
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000002265 prevention Effects 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 22
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 230000011664 signaling Effects 0.000 claims description 2
- 230000003111 delayed effect Effects 0.000 abstract description 2
- 238000004146 energy storage Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 7
- 230000002441 reversible effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
Landscapes
- Direct Current Feeding And Distribution (AREA)
Abstract
The embodiment of the invention relates to the technical field of electronic circuits, and discloses a power supply circuit and a switching device. The power supply circuit is applied to a change-over switch comprising a coil, and comprises a first power supply, a first switch circuit, a second power supply, a second switch circuit, a backflow prevention circuit and a control circuit, wherein the first power supply is connected with the coil of the change-over switch through the first switch circuit, the second power supply is connected with the coil of the change-over switch through the backflow prevention circuit, the control circuit controls the switching states of the first switch circuit and the second switch circuit according to an input control signal, when the control signal is a first level signal, the first switch circuit is controlled to be closed, when the control signal is a second level signal, the second switch circuit is controlled to be closed, so that the first power supply supplies power for the coil of the change-over switch, and after the preset time is delayed, the first switch circuit is controlled to be opened, so that the second power supply supplies power for the coil of the change-over switch. Therefore, the power consumption of the system can be effectively reduced on the basis of ensuring the reliable closing of the change-over switch.
Description
Technical Field
The embodiment of the invention relates to the technical field of electronic circuits, in particular to a power supply circuit and a switching device.
Background
The switch, such as a relay, a contactor, etc., includes a coil, and the switch including the coil is an electrical appliance which utilizes the current flowing through the coil to generate a magnetic field to drive a spring plate to pull in so as to drive a contact to be closed, thereby achieving the purpose of controlling a load.
In practical application, the auxiliary power supply is required to supply power to the coil, the auxiliary power supply needs to meet the maximum power required at the closing moment of the contact to realize reliable closing of the contact, and after the contact is closed, the auxiliary power supply continuously supplies power to the coil to maintain the closing state of the contact.
However, in the process of implementing the present invention, the inventors found that the prior art has at least the following technical problems: the prior auxiliary power supply is generally a single power supply, namely a single power supply is used for supplying power to a coil independently, a change-over switch actually only needs larger energy at the closing moment of a contact, the closing state of the contact can be maintained only by smaller energy after the contact is closed, and the single power supply scheme is adopted to continuously apply the maximum power to the coil after the contact is closed on the basis of meeting the maximum power required at the closing moment of the contact.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention provide a power supply circuit and a switch device, which can solve the technical problems of large dissipation power, high temperature rise or short service life of a switch due to an unreasonable power supply manner for a coil of the switch when the switch is used in the related art.
The embodiment of the invention provides the following technical scheme for solving the technical problems:
in a first aspect, an embodiment of the present invention provides a power supply circuit, which is applied to a switch, where the switch includes a coil, and the power supply circuit includes: a first power supply; the first end of the first switch circuit is connected with the first power supply, and the second end of the first switch circuit is used for being connected with the first end of the coil of the change-over switch; a second power supply connected to a second end of the first switching circuit; a first end of the backflow preventing circuit is connected with the second power supply, and a second end of the backflow preventing circuit is connected with a second end of the first switch circuit; the first end of the second switch circuit is used for being connected with the second end of the coil of the change-over switch, and the second end of the second switch circuit is grounded; the control circuit is connected with the control end of the first switch circuit, the control end of the first power supply and the control end of the second switch circuit respectively, the control circuit comprises a receiving end, the receiving end of the control circuit is used for receiving a control signal, the control circuit is used for controlling the first switch circuit to be closed when the control signal is a first level signal, and controlling the second switch circuit to be closed when the control signal is a second level signal, so that the first power supply supplies power to the coil of the change-over switch, and the first switch circuit is controlled to be opened after the time delay is preset, so that the second power supply supplies power to the coil of the change-over switch.
Optionally, the control circuit includes a delay circuit, the delay circuit is connected to the first power supply, the control end of the first switch circuit, and the receiving end, and the delay circuit is configured to delay the preset time length and then control the first switch circuit to be turned off when the control signal is the second level signal.
Optionally, the delay circuit includes a first resistor, a first zener diode, and a delay capacitor; one end of the first resistor is connected with the first power supply, the other end of the first resistor, the cathode of the first voltage stabilizing diode and one end of the delay capacitor are connected with the control end of the first switch circuit together, and the anode of the first voltage stabilizing diode is connected with the receiving end.
Optionally, the control circuit further includes a voltage divider circuit, a first end of the voltage divider circuit is connected to the anode of the first zener diode, and a second end of the voltage divider circuit is connected to the receiving end.
Optionally, the power supply further comprises a current limiting circuit, a first end of the current limiting circuit is connected to the first power supply, and a second end of the current limiting circuit is connected to the first end of the first switch circuit.
Optionally, the power supply further comprises an energy storage circuit, one end of the energy storage circuit is connected to the second end of the first switch circuit and the second end of the backflow prevention circuit respectively, and the other end of the energy storage circuit is grounded.
Optionally, the second switch circuit includes a triode, a third resistor, a fourth resistor, and a second zener diode; the collector of the triode is connected with the second end of the coil of the change-over switch, the emitter of the triode and one end of the second resistor are grounded together, the base of the triode is connected with the other end of the second resistor and one end of the third resistor together, the other end of the third resistor is connected with the anode of the second voltage stabilizing diode, and the cathode of the second voltage stabilizing diode is connected with the receiving end of the control circuit.
Optionally, the backflow prevention circuit is a diode, an anode of the diode is a first end of the backflow prevention circuit, and a cathode of the diode is a second end of the backflow prevention circuit.
Optionally, the first switch circuit is a PMOS transistor, a gate of the PMOS transistor is a control end of the first switch circuit, a source of the PMOS transistor is a first end of the first switch circuit, and a drain of the PMOS transistor is a second end of the first switch circuit.
In a second aspect, an embodiment of the present invention provides a switching device, including: a switch; and a power supply circuit as described above for supplying power to the coil of the diverter switch.
The embodiment of the invention has the beneficial effects that: different from the prior art, the embodiment of the invention provides a power supply circuit and a switching device. The power supply circuit is applied to the change-over switch, the change-over switch comprises a coil, the power supply circuit comprises a first power supply, a first switch circuit, a second power supply, a second switch circuit, a backflow prevention circuit and a control circuit, the first power supply is connected with the coil of the change-over switch through the first switch circuit, the second power supply is connected with the coil of the change-over switch through the backflow prevention circuit, the control circuit controls the on-off states of the first switch circuit and the second switch circuit according to an input control signal, when the control signal is a first level signal, the first switch circuit is controlled to be closed, when the control signal is a second level signal, the second switch circuit is controlled to be closed, so that the first power supply supplies power for the coil of the change-over switch, and after the preset time is delayed, the first switch circuit is controlled to be opened, so that the second power supply supplies power for the coil. Therefore, the power consumption of the system can be effectively reduced on the basis of ensuring the reliable closing of the change-over switch.
Drawings
The embodiments are illustrated by way of example only in the accompanying drawings, in which like reference numerals refer to similar elements and which are not to be construed as limiting the embodiments, and in which the figures are not to scale unless otherwise specified.
Fig. 1 is a block diagram of a switching device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a power supply circuit of FIG. 1;
FIG. 3 is a schematic diagram of a power supply circuit according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a circuit configuration of the power supply circuit provided in FIG. 3;
FIG. 5 is a schematic diagram of a power supply circuit according to another embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a power supply circuit provided in fig. 5.
Detailed Description
To facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a block diagram of a switch device according to an embodiment of the present invention. As shown in fig. 1, the switch circuit 100 includes a power supply circuit 10 and a switch 20, the power supply circuit 10 is connected to a coil of the switch 20, when the power supply circuit 10 supplies power to the coil of the switch 20, the coil is powered on to close the switch 20, and when the power supply circuit 10 does not supply power to the coil of the switch 20, the coil is powered off to open the switch 20. In the present embodiment, the switch 20 may be a relay or a contactor, but may be any other electronic device with a coil and functioning as a switch. For example, when the switch 20 is a relay, the switch circuit 100 is generally applied to an automation control circuit, the switch 20 is connected to a line through which a signal flows, and the power supply circuit 10 determines whether a coil of the switch 20 is energized based on an input control signal, and further determines whether the switch 20 is opened or closed, thereby performing functions such as automatic adjustment, safety protection, circuit switching, and the like in the circuit. The contactor is similar to the working principle of a relay, and only has a slightly different specific application occasion, no matter the relay or the contactor, when the contact is required to be closed for a period of time, the power supply circuit provides enough power for the relay coil or the contactor coil so as to meet the energy required at the moment of closing the contact, and after the contact is reliably closed, the power supply circuit needs to continuously provide certain power for the relay coil or the contactor coil so as to maintain the closed state of the contact.
Generally speaking, the contact closing moment needs larger energy, so that the power supplied by the power supply circuit is larger, and the contact closing state is maintained only by smaller energy, so that the power supply circuit only needs to supply smaller power. If a large power is supplied both at the moment of closing the contacts and maintaining the contact closed state, although it is ensured that the contacts are reliably closed and the contact closed state is maintained, the dissipated power is relatively large for a relay or a contactor, which may have the following adverse effects: on the one hand, too big dissipation power can greatly reduce the efficiency of complete machine, and on the other hand, the great temperature rise that too big dissipation power arouses then is unfavorable for the normal steady operation of relay or contactor, and when serious, there is the risk of damage in relay or contactor, especially in the system that uses a plurality of relays or contactors simultaneously, for example in the energy storage power supply, the problem of above-mentioned two aspects can be more outstanding.
Therefore, when the switch 20 needs to be closed for a period of time, the power supply circuit 10 of the embodiment provides a larger power to the coil of the switch 20 at the closing instant of the switch 20, and then provides a smaller power to the coil of the switch 20 to maintain the closed state of the switch 20, so that in this way, on the basis of ensuring that the switch 20 can be reliably closed, the dissipated power of the switch 20 can be greatly reduced, which is beneficial to improving the overall efficiency and prolonging the service life of the switch 20.
Referring to fig. 2, the power supply circuit 10 is applied to a change-over switch 20, such as a relay, a contactor, etc. including a coil 21, of the change-over switch 20. The power supply circuit 10 includes a first power supply 11, a second power supply 12, a first switch circuit 13, a second switch circuit 14, a backflow prevention circuit 15, and a control circuit 16.
The first switch circuit 13 comprises a control end 13A, a first end 13B and a second end 13C, the control end 13A of the first switch circuit 13 is connected with the control circuit 16, the first end 13B of the first switch circuit 13 is connected with the first power supply 11, the second end 13C of the first switch circuit 13 is used for being respectively connected with a first end 21A of a coil 21 of the change-over switch 20 and one end of the backflow prevention circuit 15, the other end of the backflow prevention circuit 15 is connected with the second power supply 12, the second switch circuit 14 comprises a control end 14A, the first terminal 14B and the third terminal 14C, the control terminal 14A of the second switch circuit 14 is connected to the control circuit 10, the first terminal 14B of the second switch circuit 14 is connected to the second terminal 21B of the coil 21 of the switch 20, the second terminal 14C of the second switch circuit 14 is grounded, the control circuit 16 includes a receiving terminal 16A, and the receiving terminal 16A of the control circuit 16 can receive an external control signal.
In the embodiment, the output voltage and the output power of the first power source 11 are both greater than the output voltage and the output power of the second power source 12, for example, the output voltage of the first power source is 12V, the output voltage of the second power source 12 is 6V, and the output voltages and the output powers of the first power source 11 and the second power source 12 can be determined according to actual requirements.
When the control signal is a first level signal (for example, a low level), the control circuit 16 controls the first switch circuit 13 to be turned on, and when the first switch circuit 13 is turned on, the voltage of the first power supply 11 is applied to the first end 21A of the coil 21 through the first switch circuit 13, and the backflow prevention circuit 15 can prevent the current of the power supply 11 from flowing backward to the second power supply 12; when the control signal is a second level signal (e.g. high level), the control circuit 16 controls the second switch circuit 14 to close, at this time, the first end 14B of the second switch circuit 14 is pulled to low level, there is a voltage difference between the first end 21A and the second end 21B of the coil 21, the current of the first power source 11 is sequentially sent to ground through the first switch circuit 13, the coil 21 and the second switch circuit 14, and the output voltage of the first power source 11 is applied to both ends of the coil 21, at this time, the switch 20 obtains enough energy required for the closing moment, so that the switch 20 can be reliably closed, and thereafter, the control circuit 16 controls the first switch circuit to open by delaying a preset time (the preset time can be determined according to actual requirements), so that the first power source 11 stops supplying power to the coil 21, the second power source 12 supplies power to the coil 21, and the current of the second power source 12 is sent through the anti-backup circuit 15, The coil 21 and the second switch circuit 14 are grounded, and the output voltage of the second power supply is applied to both ends of the coil 21, and the switch 20 obtains enough energy to maintain the closed state, so that the switch 20 can maintain the closed state.
Therefore, in this way, the embodiment can automatically switch the power supply for supplying power to the coil 21 of the switch 20 when the switch 20 is required to be closed, so that the dissipation power of the switch 20 is greatly reduced on the basis of ensuring that the switch 20 can be reliably closed, the overall efficiency can be improved, and the service life of the switch 20 can be effectively prolonged, thereby having good application and development prospects.
In some embodiments, as shown in fig. 3, the control circuit 16 includes a delay circuit 161, the delay circuit 161 is respectively connected to the first power source 11, the control terminal 13A of the first switch circuit 13, and the receiving terminal 16A, and the delay circuit 161 is configured to delay a preset time period and then control the first switch circuit 13 to be turned off when the control signal is the second level signal.
When the control signal is a second level signal, for example, the second level signal is a high level, the high level can drive the first switch circuit 13 to turn off, and disconnect the path for supplying power to the coil 21 by the first power source 11, the delay circuit 161 can make the first power source 11 supply power to switch the coil 21 to the second power source 12 supply power to the coil 21 for a short delay time, by continuing to supply power to the coil 21 by the first power source 11 during the delay time, it is ensured that the coil 21 obtains a large power required for the moment of closing the switch 20, so that the switch 20 can be reliably closed, after the delay time, since the switch 20 is already reliably closed, it is only necessary to satisfy the requirement that the switch 20 maintains the energy required for closing, then, the delay circuit 161 cuts off the path for supplying power to the coil 21 by the first power source 11 and makes the path for supplying power to the coil 21 by the second power source 12 conductive, thereby causing the second power source 12 to power the coil 21 to maintain the closed state of the changeover switch 20. Since the power applied to the coil 21 by the second power source 12 is relatively low compared to the first power source 11, it is possible to reduce the dissipated power of the switch 20 and reduce the temperature rise, thereby improving the efficiency and stability of the system and prolonging the service life of the switch 20.
Specifically, as shown in fig. 4, the delay circuit 161 includes a first resistor R1, a first zener diode ZD1, and a delay capacitor C1, one end of the first resistor R1 is connected to the first power source 11, the other end of the first resistor R1, the cathode of the first zener diode ZD1, and one end of the delay capacitor C1 are commonly connected to the control terminal 13A of the first switch circuit 13, and the anode of the first zener diode ZD1 is connected to the receiving terminal 16A.
To more clearly illustrate the embodiment of the present invention, the first switch circuit 13 is taken as PMOS as an example, as shown in fig. 4, the first switch circuit 13 is a PMOS transistor Q1, the gate G of the PMOS transistor Q1 is the control terminal 13A of the first switch circuit 13, the source S of the PMOS transistor Q1 is the first terminal 13B of the first switch circuit 13, and the drain D of the PMOS transistor Q1 is the second terminal 13C of the first switch circuit 13.
The switch 20 comprises two terminals 20A and 20B, 20A and 20B are respectively connected with the line, 20A and 20B can be connected through the contact of the switch 20, when the 20A and 20B are connected, the line is connected, and when the 20A and 20B are disconnected, the line is disconnected.
When the control signal from the receiving terminal 16A is a first level signal, for example, the first level signal is a low level signal of 0V, the first power source 11 and the second power source 12 are gradually established, the voltage division function of the first resistor R1 and the first zener diode ZD1 makes the gate G voltage of the PMOS transistor Q1 smaller than the source S voltage (the voltage V1 of the first power source 11), the source gate voltage VSG of the PMOS transistor Q1 larger than the threshold voltage VTH thereof, therefore, the PMOS transistor Q1 is turned on, and at this time, the first power supply 11 charges the delay capacitor C1, and simultaneously, due to the action of the first zener diode ZD1, the voltage across the delay capacitor C1 is lower, that is, the voltage at the gate G of the PMOS transistor Q1 is lower, the PMOS transistor Q1 remains closed, and, at this point, the 0V voltage fails to reach the closed condition of the second switch circuit, the second switching circuit 14 is thus turned off, no current flows through the coil 21, and the changeover switch 20 is thus in the off state.
When the control signal from the receiving terminal 16A is the second level signal, for example, the second level signal is the high level signal of 5V, due to the action of the first zener diode ZD1, the first power supply 12 continues to charge the delay capacitor C1, and the voltage across the delay capacitor C1 continuously rises, in this embodiment, the first zener diode ZD1 is adopted, so that the zener breakdown voltage Vz of the first zener diode ZD1 plus 5V (the voltage of the second level signal) is slightly greater than the voltage V1 of the first power supply 11, so that the voltage across the delay capacitor C1 (the gate G voltage of the PMOS transistor Q1) can rise to be greater than the voltage V1 of the first power supply 11 (the source S voltage of the PMOS transistor Q1) after a period of time elapses during the charging process, and during this process, the source gate voltage VSG of the PMOS transistor Q1 is less than the threshold voltage VTH, so that the PMOS transistor Q1 turns off, and at the same time, the high level signal of 5V reaches the closing condition of the second switch circuit 14, the second switching circuit 14 is thus closed and current flows through the coil 21, so that the changeover switch 20 is in the closed state.
By the action of the delay circuit 16, it is therefore ensured, on the one hand, that when the control signal from the receiver 16A is a first level signal, the first switching circuit 13 remains closed, providing for the first power supply 11 to supply power to the coil 21, and, on the other hand, which is capable of turning off the first switch circuit 13 after delaying a time (the delay time is determined by the parameters of the first resistor R1 and the delay capacitor C1) when the control signal from the receiver 16A is the second level signal, in the time delay, the first power supply 11 supplies power to the coil 21, so that the energy required by the switch 20 at the closing moment is ensured, reliable closing is realized, after the delay time, the first switch circuit 13 is turned off to stop the first power source 11 from supplying power to the coil 21, and the second power source 12 supplies power to the coil 21 to maintain the closed state of the changeover switch 20.
Referring to fig. 5 and 6, as shown in fig. 5, the control circuit 16 further includes a voltage divider 162, as shown in fig. 6, the voltage divider 162 is a resistor R4, one end of the resistor R4 is connected to the anode of the first zener diode ZD1, and the other end of the resistor R4 is connected to the receiving terminal 16A.
When receiving a first level signal (e.g., a low level), the first resistor R1, the first zener diode ZD1 and the second resistor R2 jointly perform a voltage division function, so that the voltage of the gate G of the PMOS transistor Q1 is maintained at a low level, and the PMOS transistor Q1 is ensured to operate in a conducting state.
As shown in fig. 6, the second switch circuit 14 includes a transistor Q2, a third resistor R3, a fourth resistor R4, and a second zener diode ZD2, a collector c of the transistor Q1 is connected to one end of the coil 21, an emitter e of the transistor Q1 and one end of the third resistor R3 are commonly grounded, a base b of the transistor Q1 is commonly connected to the other end of the third resistor R3 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to an anode of the second zener diode ZD2, and a cathode of the second zener diode ZD2 is connected to the receiving terminal 16A of the control circuit 16.
In this embodiment, when the receiving terminal 16A receives a first level signal, for example, the first level is a low level of 0V, the second zener diode ZD2 is not broken down, the transistor Q2 is turned off, when the receiving terminal 16A receives a second level signal, for example, the second level is a high level of 5V, the second zener diode ZD2 is broken down, the transistor Q2 is turned on when the conducting condition is met, at this time, when the PMOS transistor is turned on, the current of the first power supply 11 passes through the PMOS transistor, the coil 21 and the transistor Q1 in sequence to ground, so that the first power supply 11 supplies power to the coil 21, and when the PMOS transistor is turned off, the current of the second power supply 12 passes through the anti-backflow circuit 15, the coil 21 and the transistor Q1 in sequence to ground, so that the second power supply 12 supplies power to the coil 21.
In some embodiments, the reverse flow prevention circuit 15 is a diode D1, an anode of the diode D1 is the first terminal 15A of the reverse flow prevention circuit 15, a cathode of the diode D1 is the second terminal 15B of the reverse flow prevention circuit 15, that is, an anode of the diode D1 is connected to the second power source 12, and a cathode of the diode D2 is connected to the coil 21. Due to the unidirectional conduction characteristic of the diode D1, when the first power source 11 supplies power to the coil 21, the current of the first power source 11 is prevented from flowing backward to the second power source 12.
In some embodiments, the power supply circuit 10 further includes a tank circuit 17, one end of the tank circuit 17 is connected to the second end 13C of the first switch circuit 13 and the second end 15B of the backflow prevention circuit 15, and the other end of the tank circuit 17 is grounded. The tank circuit 17 can make the switch 20 close instantly to realize smooth switching.
The energy storage circuit 17 is an energy storage capacitor C4.
The power supply circuit 10 further includes a current limiting circuit 18, a first terminal of the current limiting circuit 18 is connected to the first power source 11, and a second terminal of the current limiting circuit 18 is connected to the first terminal 13B of the first switching circuit 13.
The current limiting circuit 18 is a resistor R5.
The power supply circuit 10 according to the embodiment of the present invention is described in detail with reference to fig. 6.
When the power-on initial stage is in operation, the receiving terminal 16A receives a low level signal of 0V, and the voltage division function of the first resistor R1, the first zener diode ZD1 and the second resistor R2 turns on the PMOS transistor, so that the current of the first power supply 11 charges the energy storage capacitor C4 through the PMOS transistor, and the current of the second power supply 12 charges the energy storage capacitor C4 through the diode D1 until the diode D1 is reverse biased and stops, and since the low level signal of 0V cannot turn on the transistor Q1, the current of the first power supply 11 cannot flow through the coil 21, and the switch 20 is in the closed state.
When the system is ready, the receiving terminal 16A receives a 5V high level signal, the 5V high level signal turns on the transistor Q1, the coil 21 starts to have a current flowing, since the energy provided by the first power supply 11 is large enough, the contact of the switch 20 obtains enough energy at the closing moment and is reliably closed, at this time, since the energy storage capacitor C4 stores voltage and has the current limiting function of the resistor R5, there is no impact current at the closing moment of the switch 20, and since the delay capacitor C1 exists, the PMOS transistor Q1 is not immediately turned off but is turned off after a period of time when the receiving terminal 16A receives the 5V high level signal, because the gate G voltage of the PMOS transistor Q1 is still low, the conducting condition of the PMOS transistor Q1 can still be met, and the first power supply 11 continuously charges the delay capacitor C1 to pull up the gate G voltage of the PMOS transistor Q1, after a certain time, the voltage of the gate G of the PMOS transistor Q1 no longer satisfies the conduction condition of the PMOS transistor Q1 and turns off, and at this time, the switch 20 is also reliably turned on, and thereafter, the voltage across the energy storage capacitor C3 decreases, when the voltage across the energy storage capacitor C4 is smaller than the difference between the voltage V2 of the second power supply 12 and the conduction voltage drop of the diode D1, the diode D1 is turned on, the second power supply 12 starts to charge the energy storage capacitor C4 and maintain the voltage across the energy storage capacitor C4, so as to satisfy the voltage required across the coil 21 when the switch 20 maintains the closed state, and the current of the second power supply 12 flows through the coil 21 after passing through the diode D1, and the coil 21 obtains the energy required to maintain the closed state, so that the switch 20 can maintain the closed state.
When the receiving terminal 16A receives the low level signal of 0V again, the switch 20 is turned off, and the system returns to the power-on initial state again.
Finally, it is to be understood that the present invention may be embodied in many different forms and is not limited to the embodiments described in the present specification, which are provided as additional limitations to the present disclosure, and which are provided for the purpose of providing a more thorough understanding of the present disclosure. In the light of the above, the above features are combined with each other and many other variations of the different aspects of the invention described above are considered to be within the scope of the present description; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A power supply circuit for a diverter switch, the diverter switch including a coil, the power supply circuit comprising:
a first power supply;
the first end of the first switch circuit is connected with the first power supply, and the second end of the first switch circuit is used for being connected with the first end of the coil of the change-over switch;
a second power supply connected to a second end of the first switching circuit;
a first end of the backflow preventing circuit is connected with the second power supply, and a second end of the backflow preventing circuit is connected with a second end of the first switch circuit;
the first end of the second switch circuit is used for being connected with the second end of the coil of the change-over switch, and the second end of the second switch circuit is grounded;
the control circuit is connected with the control end of the first switch circuit, the control end of the first power supply and the control end of the second switch circuit respectively, the control circuit comprises a receiving end, the receiving end of the control circuit is used for receiving a control signal, the control circuit is used for controlling the first switch circuit to be closed when the control signal is a first level signal, and controlling the second switch circuit to be closed when the control signal is a second level signal, so that the first power supply supplies power to the coil of the change-over switch, and the first switch circuit is controlled to be opened after the time delay is preset, so that the second power supply supplies power to the coil of the change-over switch.
2. The power supply circuit according to claim 1, wherein the control circuit comprises a delay circuit, the delay circuit is respectively connected to the first power source, the control terminal of the first switch circuit, and the receiving terminal, and the delay circuit is configured to delay the preset time period and then control the first switch circuit to be turned off when the control signal is the second level signal.
3. The power supply circuit according to claim 2, wherein the delay circuit comprises a first resistor, a first zener diode, and a delay capacitor;
one end of the first resistor is connected with the first power supply, the other end of the first resistor, the cathode of the first voltage stabilizing diode and one end of the delay capacitor are connected with the control end of the first switch circuit together, and the anode of the first voltage stabilizing diode is connected with the receiving end.
4. The power supply circuit of claim 3, wherein the control circuit further comprises a voltage divider circuit, a first terminal of the voltage divider circuit is connected to the anode of the first zener diode, and a second terminal of the voltage divider circuit is connected to the receiving terminal.
5. The power supply circuit of claim 1, further comprising a current limiting circuit, a first terminal of the current limiting circuit being coupled to the first power source, a second terminal of the current limiting circuit being coupled to the first terminal of the first switching circuit.
6. The power supply circuit according to claim 1, further comprising a tank circuit, wherein one end of the tank circuit is connected to the second end of the first switch circuit and the second end of the backflow prevention circuit, respectively, and the other end of the tank circuit is grounded.
7. The power supply circuit according to any one of claims 1 to 6, wherein the second switch circuit comprises a triode, a second resistor, a third resistor and a second zener diode;
the collector of the triode is connected with the second end of the coil of the change-over switch, the emitter of the triode and one end of the second resistor are grounded together, the base of the triode is connected with the other end of the second resistor and one end of the third resistor together, the other end of the third resistor is connected with the anode of the second voltage stabilizing diode, and the cathode of the second voltage stabilizing diode is connected with the receiving end of the control circuit.
8. The power supply circuit according to any one of claims 1 to 6, wherein the back-flow prevention circuit is a diode, an anode of the diode is a first end of the back-flow prevention circuit, and a cathode of the diode is a second end of the back-flow prevention circuit.
9. The power supply circuit according to any one of claims 1 to 6, wherein the first switch circuit is a PMOS transistor, a gate of the PMOS transistor is a control terminal of the first switch circuit, a source of the PMOS transistor is a first terminal of the first switch circuit, and a drain of the PMOS transistor is a second terminal of the first switch circuit.
10. A switching device, comprising:
a switch; and
a supply circuit as claimed in any one of claims 1 to 9, for supplying power to the coil of the diverter switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011286900.9A CN112398464A (en) | 2020-11-17 | 2020-11-17 | Power supply circuit and switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011286900.9A CN112398464A (en) | 2020-11-17 | 2020-11-17 | Power supply circuit and switching device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112398464A true CN112398464A (en) | 2021-02-23 |
Family
ID=74605833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011286900.9A Pending CN112398464A (en) | 2020-11-17 | 2020-11-17 | Power supply circuit and switching device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112398464A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114977148A (en) * | 2022-06-16 | 2022-08-30 | 上海捷勃特机器人有限公司 | Band-type brake power supply circuit and band-type brake power supply method for driving robot brake |
| CN115498617A (en) * | 2022-09-27 | 2022-12-20 | 重庆紫光华山智安科技有限公司 | Power supply protection circuit, method and device |
| CN115498991A (en) * | 2021-06-17 | 2022-12-20 | 圣邦微电子（北京）股份有限公司 | A bus holding circuit and method |
| CN115764788A (en) * | 2022-11-24 | 2023-03-07 | 中车株洲电力机车有限公司 | Redundant control circuit of vacuum circuit breaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109036960A (en) * | 2018-08-08 | 2018-12-18 | 江苏固德威电源科技股份有限公司 | A kind of relay driving control circuit |
| CN208922992U (en) * | 2018-11-22 | 2019-05-31 | 阳光电源股份有限公司 | A relay control circuit |
| CN110994774A (en) * | 2019-11-11 | 2020-04-10 | 广州亚美智造科技有限公司 | Power supply switching circuit |
| CN213846644U (en) * | 2020-11-17 | 2021-07-30 | 深圳市德兰明海科技有限公司 | Power supply circuit and switching device |
-
2020
- 2020-11-17 CN CN202011286900.9A patent/CN112398464A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109036960A (en) * | 2018-08-08 | 2018-12-18 | 江苏固德威电源科技股份有限公司 | A kind of relay driving control circuit |
| CN208922992U (en) * | 2018-11-22 | 2019-05-31 | 阳光电源股份有限公司 | A relay control circuit |
| CN110994774A (en) * | 2019-11-11 | 2020-04-10 | 广州亚美智造科技有限公司 | Power supply switching circuit |
| CN213846644U (en) * | 2020-11-17 | 2021-07-30 | 深圳市德兰明海科技有限公司 | Power supply circuit and switching device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115498991A (en) * | 2021-06-17 | 2022-12-20 | 圣邦微电子（北京）股份有限公司 | A bus holding circuit and method |
| CN114977148A (en) * | 2022-06-16 | 2022-08-30 | 上海捷勃特机器人有限公司 | Band-type brake power supply circuit and band-type brake power supply method for driving robot brake |
| CN115498617A (en) * | 2022-09-27 | 2022-12-20 | 重庆紫光华山智安科技有限公司 | Power supply protection circuit, method and device |
| CN115764788A (en) * | 2022-11-24 | 2023-03-07 | 中车株洲电力机车有限公司 | Redundant control circuit of vacuum circuit breaker |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112398464A (en) | Power supply circuit and switching device | |
| US8472216B2 (en) | Circuit arrangement and control circuit for a power-supply unit, computer power-supply unit and method for switching a power-supply unit | |
| CN217562477U (en) | Relay drive circuit and energy storage power supply | |
| CN217562478U (en) | Relay drive circuit and energy storage power supply | |
| CN213846644U (en) | Power supply circuit and switching device | |
| WO2015136797A1 (en) | Latching-relay drive circuit | |
| CN100459369C (en) | A switching control device for main and standby power supplies | |
| US9870889B2 (en) | Circuit arrangement for actuating a bistable relay | |
| CN210745102U (en) | Bidirectional electronic switch and power supply circuit | |
| CN117810026A (en) | Relay control circuit | |
| CN116454831A (en) | Intelligent circuit breaker circuit breaking protection control circuit | |
| CN109347466B (en) | Switching circuit and electronic equipment | |
| CN215299137U (en) | Control device of main power loop | |
| CN108683217B (en) | Power supply voltage monitoring circuit capable of being turned off | |
| CN222655041U (en) | Discharge circuit | |
| CN113161198B (en) | An energy-saving relay or contactor control circuit | |
| CN212162912U (en) | Back-up power supply input self-starting control circuit suitable for power distribution terminal power supply | |
| CN210122054U (en) | Power supply switching circuit and vehicle | |
| CN215183735U (en) | Energy-saving relay or contactor control circuit | |
| CN210273880U (en) | Automatic time-delay power-off control system for generator | |
| CN223927303U (en) | Relay control circuit, on-board charger and vehicle | |
| CN219144018U (en) | Relay fast switching control circuit | |
| CN220553391U (en) | Switch module for contactor and contactor module | |
| CN114362547A (en) | Relay power supply circuit, microwave sensor circuit and working method thereof | |
| CN220796589U (en) | Low-power-consumption double-voltage relay driving circuit and charging pile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 518000 19th floor, building 1, kaidar group center building, No. 168, Tongsha Road, Xinwei community, Xili street, Nanshan District, Shenzhen, Guangdong Applicant after: Shenzhen Delian Minghai New Energy Co.,Ltd. Address before: 701-3, building 2, kaidar group center building, 168 Tongsha Road, Xili street, Nanshan District, Shenzhen City, Guangdong Province Applicant before: Shenzhen Poweroak Newener Co.,Ltd. |