CN217387017U - Relay drive circuit - Google Patents
Relay drive circuit Download PDFInfo
- Publication number
- CN217387017U CN217387017U CN202221411492.XU CN202221411492U CN217387017U CN 217387017 U CN217387017 U CN 217387017U CN 202221411492 U CN202221411492 U CN 202221411492U CN 217387017 U CN217387017 U CN 217387017U
- Authority
- CN
- China
- Prior art keywords
- relay
- input
- links
- constant voltage
- circuit
- 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.)
- Active
Links
Images
Classifications
-
- 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
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Landscapes
- Electronic Switches (AREA)
Abstract
The utility model discloses a relay drive circuit relates to electron technical application, and it includes relay, constant voltage circuit, drive triode, constant voltage circuit links to each other with the input, converts the voltage of input into constant voltage, the collecting electrode of drive triode links to each other with the input positive pole, and its base links to each other with constant voltage circuit, the one end of relay coil links to each other with the projecting pole of drive triode, and the other end links to each other with the negative pole of input, relay normally open contact links to each other with the load. Get the electricity through the input port is direct, need not to connect external power source in addition, can compatible multiple interface through constant voltage circuit, enlarge through drive triode base current and can compatible relay of driving multiple voltage class, simple structure, the commonality is strong, is applicable to various passive circuit design occasions.
Description
Technical Field
The utility model relates to an electron technical application field, concretely relates to relay drive circuit.
Background
At present, the control of many electronic power devices is fixed, an active structure is integrated in a control circuit, and for a temporary assembly of a mobile device, a passive structure is preferred for control, an execution component is directly driven by using the current energy of a main load, a relay is widely applied to various control circuits as a passive device, the rated working voltage of a commonly used relay is generally 5V or 12V or 24V, the conventional relay driving circuit is usually externally connected with a power supply according to the rated working voltage of the relay and driven by the current energy of an input end port, but the driving circuit structure needs to additionally provide an external power supply, does not belong to passive driving, and cannot be compatible with various ports and multi-level voltage levels.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides a relay drive circuit that can passive drive, and compatible multistage voltage level.
The utility model provides a relay drive circuit, includes relay, constant voltage circuit, drive triode, constant voltage circuit links to each other with the input, converts the voltage of input into constant voltage, the collecting electrode of drive triode links to each other with the input positive pole, and its base links to each other with constant voltage circuit, the one end of relay coil links to each other with the projecting pole of drive triode, and the other end links to each other with the negative pole of input, relay normally open contact links to each other with the load.
Constant voltage circuit includes first resistance, first diode, first zener diode, first resistance one end is parallelly connected to be connected to the input positive pole with the collecting electrode of drive triode in parallel, and the other end is connected to the input negative pole with first diode, first zener diode in series in proper order.
The input end voltage is 5V-24V.
An indicating circuit used for indicating the working condition of the driving circuit is connected between the driving triode and the relay in parallel, and the indicating circuit comprises a light emitting diode.
And the relay coil is connected with a freewheeling diode in parallel.
And a current-limiting resistor is connected in parallel between the driving triode and the relay, one end of the current-limiting resistor is connected with the emitting electrode of the driving triode in parallel, and the other end of the current-limiting resistor is connected to the negative electrode of the input end.
The utility model has the advantages that: the utility model provides a relay drive circuit, it directly gets the electricity through the input port, need not to connect external power source in addition, can compatible multiple interface through constant voltage circuit, through the relay of drive triode base current amplification ability compatible multiple voltage class of drive, simple structure, the commonality is strong, is applicable to various passive circuit design occasions.
Drawings
Fig. 1 is a schematic circuit diagram according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be further explained with reference to the drawings.
As shown in fig. 1, a relay driving circuit includes a relay K1, a constant voltage circuit, and a driving transistor Q2, where the constant voltage circuit is connected to an input terminal, the input terminal may be an NPN interface, a PNP interface, a switching value output interface, a single chip I/O interface, and the like, and may be compatible with multiple inputs, a voltage range of the input terminal is 5V-24V, and the constant voltage circuit converts the 5V-24V voltage input from the input terminal into a constant voltage. The collector of the driving triode Q2 is connected with the positive electrode of the input end, the base of the driving triode Q2 is connected with the first resistor R20 in parallel, one end of the coil of the relay K1 is connected with the emitting electrode of the driving triode Q2, the other end of the coil of the relay K1 is connected with the negative electrode of the input end, and the normally open contact of the relay K1 is connected with the load. The driving transistor Q2 drives the relay through the base current amplification function, so that the relay with the rated working voltage of 5V/12V/24V can be compatible.
In this embodiment, a current-limiting resistor R1 and an indication circuit are connected in parallel between the driving transistor Q2 and the relay K1, the indication circuit is a light emitting diode D1, and one end of the current-limiting resistor R1 is connected in parallel with an emitter of the driving transistor Q2, is connected in series with a light emitting diode D1, and is then connected to a negative electrode of an input terminal. When the driving circuit works, the light emitting diode D1 lights to play an indicating role, and the current limiting resistor plays a role in reducing power consumption.
In this embodiment, a freewheeling diode D13 is connected in parallel to both ends of the coil of the driving transistor Q2, and the freewheeling diode D13 acts as a freewheeling current after the relay is turned off, so as to clamp the induced voltage of the coil of the relay to 0.7V or less and protect the front-end circuit.
As the temporary assembly of the mobile equipment, the relay driving circuit of the embodiment can be integrated on the circuit board to form a relay board, so that the convenience is better.
The examples should not be construed as limiting the invention, and any non-inventive modifications based on the spirit of the invention should be construed as within the scope of the invention.
Claims (6)
1. A relay drive circuit, characterized in that: including relay, constant voltage circuit, drive triode, constant voltage circuit links to each other with the input, converts the voltage of input into constant voltage, the collecting electrode of drive triode links to each other with the input positive pole, and its base links to each other with constant voltage circuit, the one end of relay coil links to each other with the projecting pole of drive triode, and the other end links to each other with the negative pole of input, relay normally open contact links to each other with the load.
2. A relay drive circuit according to claim 1, wherein: constant voltage circuit includes first resistance, first diode, first zener diode, first resistance one end is parallelly connected to be connected to the input positive pole with the collecting electrode of drive triode in parallel, and the other end is connected to the input negative pole with first diode, second zener diode in series in proper order.
3. The relay drive circuit according to claim 1, wherein: the input end voltage is 5V-24V.
4. A relay drive circuit according to claim 1, wherein: an indicating circuit used for indicating the working condition of the driving circuit is connected in parallel between the driving triode and the relay, and the indicating circuit comprises a light emitting diode.
5. The relay drive circuit according to claim 1, wherein: and the relay coil is connected with a freewheeling diode in parallel.
6. A relay drive circuit according to claim 1, wherein: and a current-limiting resistor is connected in parallel between the driving triode and the relay, one end of the current-limiting resistor is connected with the emitting electrode of the driving triode in parallel, and the other end of the current-limiting resistor is connected to the negative electrode of the input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221411492.XU CN217387017U (en) | 2022-06-08 | 2022-06-08 | Relay drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221411492.XU CN217387017U (en) | 2022-06-08 | 2022-06-08 | Relay drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217387017U true CN217387017U (en) | 2022-09-06 |
Family
ID=83092323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221411492.XU Active CN217387017U (en) | 2022-06-08 | 2022-06-08 | Relay drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217387017U (en) |
-
2022
- 2022-06-08 CN CN202221411492.XU patent/CN217387017U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202373957U (en) | Over-voltage and under-voltage protection circuit | |
| CN211429601U (en) | Open circuit and short circuit detection circuit and LED switching power supply control system | |
| CN106533144B (en) | Anti-reverse and current flowing backwards circuit | |
| CN217387017U (en) | Relay drive circuit | |
| CN100527306C (en) | Control circuit of relay | |
| CN203225649U (en) | Drive circuit of field effect transistor | |
| CN213991098U (en) | LED drive circuit with protection function | |
| CN214544872U (en) | LED drive protection circuit and device | |
| CN212258410U (en) | Anti-impact current protection circuit applied to photovoltaic energy storage system | |
| CN210469110U (en) | Discrete high-side driving circuit system | |
| CN210899112U (en) | Electronic switch circuit with low power consumption | |
| CN110601512A (en) | Discrete high-side driving circuit system | |
| CN219498950U (en) | Battery low voltage protection circuit and PCB board | |
| CN212276245U (en) | Four-channel drive integrated circuit and control device | |
| CN212627147U (en) | Overcurrent protection circuit applied to frequency converter | |
| CN220673376U (en) | Power supply voltage protection circuit | |
| CN215154253U (en) | Low-side output circuit with current limiting function | |
| CN216564978U (en) | Motor drive control circuit | |
| CN217849732U (en) | Protection circuit for automobile lamp and automobile lamp with protection circuit | |
| CN214202079U (en) | Two-channel drive integrated circuit and control device | |
| CN220996321U (en) | Power supply circuit of accelerator pedal | |
| CN217720725U (en) | Vehicle-mounted reverse connection prevention protection circuit | |
| CN220857622U (en) | Protection circuit | |
| CN219086799U (en) | Transient surge voltage suppression circuit and power supply system | |
| CN220399838U (en) | Primary step-down driving circuit of program-controlled high-voltage linear power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |