CN215772540U - TTL signal control loading circuit - Google Patents
TTL signal control loading circuit Download PDFInfo
- Publication number
- CN215772540U CN215772540U CN202121952602.9U CN202121952602U CN215772540U CN 215772540 U CN215772540 U CN 215772540U CN 202121952602 U CN202121952602 U CN 202121952602U CN 215772540 U CN215772540 U CN 215772540U
- Authority
- CN
- China
- Prior art keywords
- relay
- resistor
- triode
- ttl signal
- diode
- 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
Landscapes
- Electronic Switches (AREA)
Abstract
The embodiment of the utility model discloses a TTL signal control loading circuit, which comprises a triode Q1, a relay K1, a resistor R2, a resistor R3, a resistor R4 and a diode D1, wherein the base electrode of the triode Q1 is externally connected with a TTL signal end through the resistor R2, and the emitter electrode of the triode Q1 is grounded; one end of the control end of the relay K1 is connected with a power supply of the relay, and the other end of the control end of the relay K1 is connected with the collector of the triode Q1; the diode D1 is connected with the control end of the relay K1 in parallel, and the anode of the diode D1 is connected with the collector of the triode Q1; two ends of the resistor R4 are respectively connected with the base electrode and the emitter electrode of the triode Q1; the resistor R3 is a load resistor and is connected to one end of the output knife end of the relay K1. The utility model adopts simple devices, has low cost and high safety and reliability; meanwhile, a low-voltage TTL signal is adopted, so that the high voltage is controlled at low voltage, and the safety is greatly improved; the output end of the relay adopts an RC absorption circuit, so that the peak voltage generated when the knife switch is closed can be effectively attracted, and the generation of electric arcs is avoided.
Description
Technical Field
The utility model relates to the technical field of switching power supplies, in particular to a TTL signal control loading circuit.
Background
Most of the current power supply products on the market are directly applied to a load end, and some power supply products can realize the on-off control function of the load through hard switches such as an air switch, an intermediate relay, a knife switch and the like.
The traditional loading circuit has the problems of high price and safety. For example, the intermediate relay is expensive; if a knife switch is adopted, when the switch is closed, a large electric arc may be generated, which may cause a safety hazard to production.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the embodiments of the present invention is to provide a TTL signal controlled loading circuit to solve the problem of security when loading a circuit and reduce the design cost.
In order to solve the above technical problem, an embodiment of the present invention provides a TTL signal control loading circuit, which includes a transistor Q1, a relay K1, a resistor R2, a resistor R3, a resistor R4, and a diode D1, wherein a base of the transistor Q1 is externally connected to a TTL signal terminal through the resistor R2, and an emitter of the transistor Q1 is grounded; one end of the control end of the relay K1 is connected with a power supply of the relay, and the other end of the control end of the relay K1 is connected with the collector of the triode Q1; the diode D1 is connected with the control end of the relay K1 in parallel, and the anode of the diode D1 is connected with the collector of the triode Q1; two ends of the resistor R4 are respectively connected with the base electrode and the emitter electrode of the triode Q1; the resistor R3 is a load resistor and is connected to one end of the output knife end of the relay K1.
Further, the circuit also comprises an RC circuit which is connected with the output knife switch end of the relay K1 in parallel and consists of a resistor R1 and a capacitor C1.
Further, the transistor Q1 is an NPN transistor.
The utility model has the beneficial effects that: the utility model adopts simple devices, has low cost and high safety and reliability; meanwhile, a low-voltage TTL signal is adopted, so that the high voltage is controlled at low voltage, and the safety is greatly improved; the output end of the relay adopts an RC absorption circuit, so that the peak voltage generated when the knife switch is closed can be effectively attracted, the generation of electric arcs is avoided, and the occurrence of safety accidents is avoided.
Drawings
Fig. 1 is a circuit diagram of a TTL signal controlled loading circuit according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict, and the present invention is further described in detail with reference to the drawings and specific embodiments.
Referring to fig. 1, the TTL signal controlled loading circuit according to the embodiment of the present invention includes a transistor Q1, a relay K1, a resistor R2, a resistor R3, a resistor R4, and a diode D1.
The base electrode of the triode Q1 is externally connected with a TTL signal end through a resistor R2, and the emitter electrode of the triode Q1 is grounded. One end of the control end (namely the coil end) of the relay K1 is connected with a power supply of the relay, and the other end is connected with the collector electrode of the triode Q1. The diode D1 is connected in parallel with the control end of the relay K1, and the anode of the diode D1 is connected with the collector of the triode Q1.
Two ends of the resistor R4 are respectively connected with the base electrode and the emitter electrode of the triode Q1. The resistor R3 is a load resistor and is connected to one end of the output knife end of the relay K1. The other end of the output knife-edge of the relay K1 is connected with an output voltage end.
In one embodiment, the TTL signal control loading circuit further includes an RC circuit connected in parallel with the output blade terminal of the relay K1, and the RC circuit is composed of a resistor R1 and a capacitor C1.
In one embodiment, the transistor Q1 is an NPN transistor.
The working principle of the utility model is as follows: VCC is the working power supply of the relay, VOUT is the output voltage, and TTL is the low-voltage control signal voltage; when TTL signal is low voltage, base voltage of Q1 is 0V, so Q1 is turned off, no current passes through coil of K1, output knife switch end of K1 is opened, no voltage is generated in R3, when TTL signal is high voltage, high voltage is generated on base of Q1 after voltage division is carried out through R2 and R4, Q1 is saturated and conducted, VCC is passed through line graph of K1, D pole and S pole of Q1 form a loop, K1 relay works, output knife switch of K1 is closed, VOUT is passed through K1 knife switch end, R3 forms a loop, VOUT loads R3, R1 and C1 are tips generated when knife switches are closed, damage to load is prevented, when knife switch is low level, Q1 is turned off, coil of K1 is opened, and because inductance can not change suddenly, a reverse electromotive force is generated in coil, D1 is turned on, energy on inner coil of K1 is consumed through inner resistance of self.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A TTL signal control loading circuit is characterized by comprising a triode Q1, a relay K1, a resistor R2, a resistor R3, a resistor R4 and a diode D1, wherein the base electrode of the triode Q1 is externally connected with a TTL signal end through the resistor R2, and the emitter electrode of the triode Q1 is grounded; one end of the control end of the relay K1 is connected with a power supply of the relay, and the other end of the control end of the relay K1 is connected with the collector of the triode Q1; the diode D1 is connected with the control end of the relay K1 in parallel, and the anode of the diode D1 is connected with the collector of the triode Q1; two ends of the resistor R4 are respectively connected with the base electrode and the emitter electrode of the triode Q1; the resistor R3 is a load resistor and is connected to one end of the output knife end of the relay K1.
2. The TTL signal controlled load circuit of claim 1, further comprising an RC circuit connected in parallel with the output blade terminal of the relay K1, the RC circuit comprising a resistor R1 and a capacitor C1.
3. The TTL signal controlled load circuit of claim 1, wherein the transistor Q1 is an NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121952602.9U CN215772540U (en) | 2021-08-19 | 2021-08-19 | TTL signal control loading circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121952602.9U CN215772540U (en) | 2021-08-19 | 2021-08-19 | TTL signal control loading circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215772540U true CN215772540U (en) | 2022-02-08 |
Family
ID=80076748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121952602.9U Active CN215772540U (en) | 2021-08-19 | 2021-08-19 | TTL signal control loading circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215772540U (en) |
-
2021
- 2021-08-19 CN CN202121952602.9U patent/CN215772540U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN214153992U (en) | Control circuit for realizing load switch control and detection protection of single-chip microcomputer IO port | |
| CN215772540U (en) | TTL signal control loading circuit | |
| CN201860094U (en) | Short circuit protection circuit for switch power | |
| CN101540242B (en) | Energy-saving magnetic latching relay circuit | |
| CN208174653U (en) | A kind of driving circuit of field effect transistor | |
| CN217467504U (en) | Power supply circuit and electrical equipment | |
| CN102013664B (en) | Protection device for transformer | |
| CN211352552U (en) | LED lighting circuit with short-circuit protection function | |
| CN213661197U (en) | Short-circuit protection circuit based on Hall current sensor and voltage comparator | |
| CN209981110U (en) | Intelligent switch relay control circuit | |
| CN112510648A (en) | Short-circuit protection circuit based on Hall current sensor and voltage comparator | |
| CN206250742U (en) | A kind of output short circuit protection circuit | |
| CN214100844U (en) | Direct current load short circuit protection circuit | |
| CN205646779U (en) | Intelligent security on -off controller | |
| CN220022772U (en) | Switching circuit and electronic device | |
| CN212183100U (en) | Simple load short-circuit protection circuit | |
| CN219498950U (en) | Battery low voltage protection circuit and PCB board | |
| CN205265649U (en) | Control circuit based on triode switching action | |
| CN211979471U (en) | Intelligent switch is with single live wire relay circuit of getting | |
| CN204732349U (en) | For the control circuit of relay and relay-set and electromagnetic cooking appliance | |
| CN219499208U (en) | MTC trigger driving circuit | |
| CN207612252U (en) | A kind of metal-oxide-semiconductor output protection circuit of low cost | |
| CN212848235U (en) | Contactor | |
| CN220754344U (en) | Short-circuit protection circuit suitable for buck controller | |
| CN210245415U (en) | Wireless power relay |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |