CN218414406U - Low-loss relay drive circuit - Google Patents
Low-loss relay drive circuit Download PDFInfo
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- CN218414406U CN218414406U CN202222504889.XU CN202222504889U CN218414406U CN 218414406 U CN218414406 U CN 218414406U CN 202222504889 U CN202222504889 U CN 202222504889U CN 218414406 U CN218414406 U CN 218414406U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a low-loss relay drive circuit, it includes first port, the second port, high-pressure input port, low pressure input port, control port, power switching circuit, automatic switch circuit and drive switch circuit, first port is used for the anodal port of electricity connection load, the second port is used for the negative pole port of electricity connection load, high-pressure input port is used for inserting DC high voltage power, low pressure input port is used for inserting DC low voltage power, control port is used for receiving control signal, drive switch circuit is used for the power of amplified control signal, power switching circuit is used for switching the power supply mode to DC high voltage power supply or DC low voltage power supply, automatic switch circuit is used for discerning the action of the change of control signal with control load; the utility model discloses only need simple circuit can realize automatically that the drive high-low pressure switches, have that the circuit is simple, circuit device is few, with low costs, the reliability is high, the resource occupies characteristics such as few.
Description
Technical Field
The utility model relates to a relay drive circuit field especially relates to a low-loss relay drive circuit.
Background
With the development of high-power electronic products, a high-power relay is widely applied to an alternating current side and a direct current side, and a coil of the high-power relay needs higher voltage for attracting, so that larger loss can be generated, and the product efficiency is reduced. In order to reduce the loss, a circuit design needs to be performed by a method of high-voltage starting and low-voltage maintaining.
The prior art has three main methods for driving a relay. The first method is to use a voltage-doubling boost circuit to achieve the instantaneous high voltage, and this method needs to use a large energy-storage capacitor, which results in the disadvantages of large PCB occupation and complicated parameter adjustment. The second method is to control the driving signal and two driving power sources respectively through software, and control the voltage switching through extra logic, which causes the defects of more occupied control resources, complex software logic and poor reliability. The third method is to use extra signal processing device to set the duration of each level, and this method has complicated circuit device, large setting amount, high cost and poor reliability. Although the three methods can drive the relay, the three methods have technical defects and are inconvenient to apply and popularize on a large scale.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a low-loss relay drive circuit, it only needs simple circuit can realize automatically that the drive high-low pressure switches, has that the circuit is simple, circuit device is few, with low costs, the reliability is high, the resource occupies characteristics such as few.
In order to realize purposefully, the utility model discloses a low-loss relay drive circuit, it includes first port, second port, high-pressure input port, low pressure input port, control port, power switching circuit, automatic switch circuit and drive switch circuit electricity in proper order are connected, first port is used for the electric positive pole port of connecting the load, the second port is used for the electricity to be connected the negative pole port of load, high pressure input port is used for inserting DC high voltage power supply, low pressure input port is used for inserting DC low voltage power supply, the control port is used for receiving control signal, drive switch circuit is used for enlargiing control signal's power, power switching circuit is used for switching over the power supply mode to DC high voltage power supply or DC low voltage power supply, automatic switch circuit is used for discerning control signal's change is with control the action of load.
Compared with the prior art, the utility model discloses a power supply switching circuit, automatic switch-over circuit and drive switch circuit electricity are connected in proper order, drive switch circuit is used for enlargiing control signal's power, power supply switching circuit is used for switching power supply mode to DC high voltage power supply or DC low voltage power supply, automatic switch-over circuit is used for discerning the action of control signal's change in order to control load, it only needs simple circuit can realize the switching of drive high-low pressure automatically, it is simple to have a circuit, the circuit device is few, with low costs, the reliability is high, the resource occupies characteristics such as few.
Preferably, the driving switch circuit includes a first resistor R1, a second resistor R2 and a first triode Q1, a base of the first triode Q1 is electrically connected to the control port through the first resistor R1, a collector of the first triode Q1 is electrically connected to the second port, an emitter of the first triode Q1 is grounded, and a base of the first resistor R1 and a base of the first triode Q1 are grounded through the second resistor R2.
Preferably, the automatic switching circuit includes a first capacitor C1, a third resistor R3, a fourth resistor R4, a first diode D1 and a second triode Q2, one end of the first capacitor C1 is electrically connected to the control port through the third resistor R3, the other end is electrically connected to the base of the second triode Q2, the emitter of the second triode Q2 is grounded, one end of the fourth resistor R4 is electrically connected between the bases of the first capacitor C1 and the second triode Q2, the other end is grounded, the anode of the first diode D1 is grounded, and the cathode is electrically connected between the first capacitor C1 and the fourth resistor R4.
Preferably, the power switching circuit includes a fifth resistor R5, a sixth resistor R6, a second diode D2, and a third triode Q3, one end of the fifth resistor R5 is electrically connected to the high-voltage input port, the other end of the fifth resistor R5 is electrically connected to a collector of the second triode Q2 through the sixth resistor R6, a base of the third triode Q3 is electrically connected between the fifth resistor R5 and the sixth resistor R6, an emitter is electrically connected to the high-voltage input port, the collector is electrically connected to a cathode of the second diode D2, and an anode of the second diode D2 is electrically connected to the low-voltage input port.
Preferably, the first transistor Q1 and the second transistor Q2 are both NPN transistors.
Preferably, the third transistor Q3 is a PNP transistor.
Preferably, the load is a relay.
Preferably, the voltage of the DC high-voltage power supply is 24V.
Preferably, the voltage of the DC low-voltage power supply is 12V.
Preferably, the low-loss relay driving circuit further comprises a snubber circuit for absorbing energy and a back electromotive force released from a coil of the relay, thereby accelerating the turn-off of the relay.
Drawings
Fig. 1 is a circuit diagram of a low loss relay drive circuit of the present invention.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.
Referring to fig. 1, the low-loss relay driving circuit of this embodiment includes a first port 1, a second port 2, a high-voltage input port 3, a low-voltage input port 4, a control port 5, a power switching circuit 6, an automatic switching circuit 7, and a driving switch circuit 8, where the power switching circuit 6, the automatic switching circuit 7, and the driving switch circuit 8 are sequentially electrically connected, the first port 1 is used to electrically connect an anode port RLY + of a load 9, the second port 2 is used to electrically connect a cathode port RLY + of the load 9, the high-voltage input port 3 is used to access a DC high-voltage power supply 10, the low-voltage input port 4 is used to access a DC low-voltage power supply 11, the control port 5 is used to receive a control signal, the driving switch circuit 8 is used to amplify power of the control signal, the power switching circuit 6 is used to switch a power supply mode to the DC high-voltage power supply 10 or the DC low-voltage power supply 11 for supplying power, and the automatic switching circuit 7 is used to identify a change of the control signal to control an action of the load 9.
It will be appreciated that the load 9 is here a relay and the automatic switching circuit 7 is arranged to recognise a change in said control signal to control the actuation and the release of the relay. Of course, in other embodiments, the load 9 may also be other electric devices that need to switch the voltage to control the state change. For the driving control of the relay, the voltage of the DC high voltage power supply 10 of the present embodiment is 24V, and the voltage of the DC low voltage power supply 11 is 12V. For ease of description, the positive port of the relay is labeled RLY +, and the negative port is labeled RLY-. When the corresponding load 9 is other types of electric equipment, the voltage of the DC high-voltage power supply 10 and the voltage of the DC low-voltage power supply 11 are set according to actual requirements.
Preferably, the driving switch circuit 8 includes a first resistor R1, a second resistor R2 and a first transistor Q1, where the first transistor Q1 is an NPN-type transistor. The base electrode of the first triode Q1 is electrically connected with the control port 5 through the first resistor R1, the collector electrode of the first triode Q1 is electrically connected with the second port 2, the emitting electrode of the first triode Q1 is grounded, and the base electrode of the first resistor R1 and the base electrode of the first triode Q1 are grounded through the second resistor R2.
Preferably, the automatic switching circuit 7 includes a first capacitor C1, a third resistor R3, a fourth resistor R4, a first diode D1, and a second transistor Q2, where the second transistor Q2 is preferably an NPN-type transistor. One end of the first capacitor C1 is electrically connected to the control port 5 through the third resistor R3, the other end of the first capacitor C1 is electrically connected to the base of the second triode Q2, the emitter of the second triode Q2 is grounded, one end of the fourth resistor R4 is electrically connected between the bases of the first capacitor C1 and the second triode Q2, the other end of the fourth resistor R4 is grounded, the anode of the first diode D1 is grounded, and the cathode of the first diode D1 is electrically connected between the first capacitor C1 and the fourth resistor R4.
Preferably, the power switching circuit 6 includes a fifth resistor R5, a sixth resistor R6, a second diode D2 and a third transistor Q3, and preferably, the third transistor Q3 is a PNP transistor. One end of the fifth resistor R5 is electrically connected with the high-voltage input port 3, the other end of the fifth resistor R5 is electrically connected with the collector of the second triode Q2 through the sixth resistor R6, the base of the third triode Q3 is electrically connected between the fifth resistor R5 and the sixth resistor R6, the emitter is electrically connected with the high-voltage input port 3, the collector is electrically connected with the cathode of the second diode D2, and the anode of the second diode D2 is electrically connected with the low-voltage input port 4.
Preferably, the low-loss relay driving circuit further comprises a snubber circuit for absorbing energy and a back electromotive force released from a coil of the relay, thereby accelerating the turn-off of the relay. The absorption circuit can be a diode, an RCD circuit or a parallel voltage regulator tube.
The operation of the low-loss relay driving circuit of the present embodiment will be described in detail below:
1. initial state: the level of the control signal is low level, the first triode Q1 is in a cut-off state, at the moment, the positive electrode port RLY + and the negative electrode port RLY-of the relay are powered by 12V through the second diode D2, no voltage exists between the coils of the relay, and the relay is in a cut-off state;
2. the suction moment: in the process that the level of the control signal is changed from low level to high level, the first capacitor C1 is charged through the third resistor R3 and the fourth resistor R4, the base electrode of the second triode Q2 is instantly charged to high level, and the second triode Q2 is changed from cut-off to a conducting state. The fifth resistor R5 and the sixth resistor R6 are divided into 24V, the base of the third triode Q3 becomes low, the third triode Q3 is turned on, the second diode D2 is turned off, and the positive port RLY + of the relay becomes 24V. Meanwhile, the first triode Q1 is driven to be conducted by high level, the negative electrode port RLY-of the relay becomes 0 level, and the relay is started to pull in at 24V;
3. drive switching timing: because the input of the control signal is continuously high level, the base electrode of the second triode Q2 is gradually discharged by the fourth resistor R4 and is changed into low level again, the second triode Q2 is cut off, meanwhile, the base electrode of the third triode Q3 is changed into high level, the third triode Q3 is cut off, the second diode D2 is conducted, the positive electrode port RLY + of the relay is changed into 12V, the negative electrode port RLY-of the relay is still low level because the first triode Q1 is still in a conducting state, and the coil of the relay keeps attracting for 12V;
4. disconnection time: when the relay is disconnected, the control signal is changed from a high level to a low level, the base electrode of the second audion Q2 is still at a 0 level due to the clamping of the first diode D1, the positive electrode port RLY + of the relay is still at 12V, the base electrode of the first audion Q1 is changed into a 0 level along with the signal, the first audion Q1 is cut off, the negative electrode port RLY-of the relay is changed into 12V, and the relay coil is disconnected without excitation.
Through the circuit arrangement, the circuit debugging of the low-loss relay driving circuit of the embodiment can realize different high-voltage delay time only by changing the third resistor R3 and the first capacitor C1, and the adjustment flexibility of the circuit is greatly expanded.
Combine fig. 1, the utility model discloses a power supply switching circuit 6, automatic switch circuit 7 and drive switch circuit 8 electricity in proper order are connected, drive switch circuit 8 is used for enlargiing control signal's power, power supply switching circuit 6 is used for switching the power supply mode to DC high voltage power supply 10 power supply or DC low voltage power supply 11 power supply, automatic switch circuit 7 is used for discerning control signal's change with the action of control load 9, it only needs simple circuit can realize the switching of drive high-low pressure automatically, it is simple to have a circuit, circuit device is few, with low costs, the reliability is high, the resource occupies characteristics such as few.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, therefore, the invention is not limited thereto.
Claims (10)
1. A low-loss relay drive circuit, characterized by: including first port, second port, high-voltage input port, low pressure input port, control port, power supply switching circuit, automatic switch circuit and drive switch circuit electricity in proper order are connected, first port is used for the anodal port of electricity connection load, the second port is used for the electricity to be connected the negative pole port of load, high-voltage input port is used for inserting DC high voltage power, low pressure input port is used for inserting DC low voltage power, control port is used for receiving control signal, drive switch circuit is used for enlargiing control signal's power, power supply switching circuit is used for switching the power supply mode to DC high voltage power supply or DC low voltage power supply, automatic switch circuit is used for discerning control signal's change is with control the action of load.
2. The low loss relay drive circuit of claim 1, wherein: the drive switch circuit comprises a first resistor R1, a second resistor R2 and a first triode Q1, wherein the base of the first triode Q1 is electrically connected with the control port through the first resistor R1, the collector of the first triode Q1 is electrically connected with the second port, the emitter of the first triode Q1 is grounded, and the base of the first resistor R1 and the base of the first triode Q1 are grounded through the second resistor R2.
3. The low loss relay drive circuit of claim 2, wherein: the automatic switching circuit comprises a first capacitor C1, a third resistor R3, a fourth resistor R4, a first diode D1 and a second triode Q2, one end of the first capacitor C1 is electrically connected with the control port through the third resistor R3, the other end of the first capacitor C1 is electrically connected with the base electrode of the second triode Q2, the emitting electrode of the second triode Q2 is grounded, one end of the fourth resistor R4 is electrically connected between the base electrodes of the first capacitor C1 and the second triode Q2, the other end of the fourth resistor R4 is grounded, the anode of the first diode D1 is grounded, and the cathode of the first diode D1 is electrically connected between the first capacitor C1 and the fourth resistor R4.
4. The low loss relay drive circuit of claim 3, wherein: the power supply switching circuit comprises a fifth resistor R5, a sixth resistor R6, a second diode D2 and a third triode Q3, one end of the fifth resistor R5 is electrically connected with the high-voltage input port, the other end of the fifth resistor R5 is electrically connected with the collector of the second triode Q2 through the sixth resistor R6, the base of the third triode Q3 is electrically connected between the fifth resistor R5 and the sixth resistor R6, the emitter is electrically connected with the high-voltage input port, the collector is electrically connected with the cathode of the second diode D2, and the anode of the second diode D2 is electrically connected with the low-voltage input port.
5. The low loss relay drive circuit of claim 3, wherein: the first triode Q1 and the second triode Q2 are both NPN type triodes.
6. The low loss relay drive circuit of claim 4, wherein: and the third triode Q3 is a PNP type triode.
7. The low loss relay drive circuit of claim 1, wherein: the load is a relay.
8. The low loss relay drive circuit of claim 7, wherein: the voltage of the DC high-voltage power supply is 24V.
9. The low loss relay drive circuit according to claim 7, wherein: the voltage of the DC low-voltage power supply is 12V.
10. The low loss relay drive circuit according to claim 7, wherein: the energy-absorbing relay further comprises an absorbing circuit, wherein the absorbing circuit is used for absorbing the energy and the back electromotive force released by the coil of the relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222504889.XU CN218414406U (en) | 2022-09-20 | 2022-09-20 | Low-loss relay drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222504889.XU CN218414406U (en) | 2022-09-20 | 2022-09-20 | Low-loss relay drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN218414406U true CN218414406U (en) | 2023-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222504889.XU Active CN218414406U (en) | 2022-09-20 | 2022-09-20 | Low-loss relay drive circuit |
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|---|---|
| CN (1) | CN218414406U (en) |
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- 2022-09-20 CN CN202222504889.XU patent/CN218414406U/en active Active
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