CN221508049U - Signal-free magnetic latching relay driving circuit - Google Patents
Signal-free magnetic latching relay driving circuit Download PDFInfo
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- CN221508049U CN221508049U CN202323267709.1U CN202323267709U CN221508049U CN 221508049 U CN221508049 U CN 221508049U CN 202323267709 U CN202323267709 U CN 202323267709U CN 221508049 U CN221508049 U CN 221508049U
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Abstract
A signal-free magnetic latching relay drive circuit comprising: the first switch unit, the second switch unit, the first control unit and the second control unit; the first switch unit and the second switch unit are used for switching the working state of the magnetic latching relay by changing the on-off state; the first control unit is used for receiving the positive direct current voltage and controlling the on-off of the first switch unit according to the positive direct current voltage; the second control unit is used for receiving the negative direct-current voltage and controlling the on-off of the second switch unit according to the negative direct-current voltage; the circuit can complete the driving of the magnetic latching relay by only supplying positive direct current or negative direct current to the power end without adding a special driving circuit and a control circuit and simultaneously supplying large current to the relay coil for a long time to ensure the closing or opening of the relay, so that the complexity of the whole control process is reduced.
Description
Technical Field
The utility model relates to the technical field of magnetic latching relay driving, in particular to a signal-free magnetic latching relay driving circuit.
Background
The magnetic latching relay is a relay which keeps the contact in an open or closed state by means of self permanent magnetic force, and has the function of automatically switching on and off a circuit as other electromagnetic relays. The difference is that: the common electromagnetic relay is electrified and attracted, and no electricity is released; the normally closed or normally open state of the magnetic latching relay is completely dependent on the action of permanent magnet steel, and the switching state is switched by applying positive and negative direct voltage pulses to the coil, so that no current needs to pass through the coil during the armature state. The magnetic latching relay has the advantages that the magnetic latching relay has a holding function, can immediately resume work after power supply is restored when power failure and the like occur, does not need to wait for the control system to restart and then start to work, does not need to continuously electrify the relay coil during normal work, has low power consumption, and can not generate electromagnetic interference on surrounding circuits.
The existing relay driving circuit mainly comprises the following components:
1. SCM control scheme
The power supply of the traditional relay coil is realized by controlling the triode or the MOS tube to be switched through the IO port of the singlechip, the relay is closed and opened, the circuit needs the singlechip to supply power for the triode or the MOS tube for a long time, therefore, the relay is kept on and off, and meanwhile, the triode, the MOS tube and the coil need to continuously flow larger current, so that the circuit has larger overall power consumption, lower reliability and complex circuit.
2. Drive chip control scheme
The circuit has the advantages that the number of used devices is reduced, the overall cost is high, a singlechip is still required to give out control signals, and the circuit cannot be used in occasions without control chips.
When the circuit related to the scheme works, signals are required to be transmitted to the relay to control the relay to be closed or opened, and the whole control process is required to process the signals, so that the complexity is high.
Disclosure of utility model
In order to solve the problems that the prior art needs to send signals to the relay to control the relay to be closed or opened, the whole control process needs to process the signals and has high complexity, the utility model provides the signal-free magnetic latching relay driving circuit, which switches the working state of the magnetic latching relay by changing the on-off states of the first switch unit and the second switch unit, the first control unit is used for receiving positive direct current voltage and controlling the on-off of the first switch unit according to the positive direct current voltage, the second control unit is used for receiving negative direct current voltage and controlling the on-off of the second switch unit according to the negative direct current voltage, so that the circuit can complete the driving of the magnetic latching relay only by introducing positive direct current or negative direct current at the power end, a special driving circuit and a control circuit are not required to be added, and meanwhile, the relay coil is not required to be introduced with large current for a long time to ensure the closing or opening of the relay, so that the complexity of the whole control process is reduced.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a signal-free magnetic latching relay drive circuit comprising: the first switch unit, the second switch unit, the first control unit and the second control unit;
the first switch unit and the second switch unit are used for switching the working state of the magnetic latching relay by changing the on-off state;
The first control unit is used for receiving the positive direct current voltage and controlling the on-off of the first switch unit according to the positive direct current voltage;
and the second control unit is used for receiving the negative direct current voltage and controlling the on-off of the second switch unit according to the negative direct current voltage.
The drive circuit of the signal-free magnetic latching relay is further optimized: the first control unit comprises a first resistor R1, a second resistor R2, a first capacitor C1 and a first switching tube, one end of the first resistor R1 is connected with a positive direct current voltage input end VCC, the other end of the first resistor R1 is connected with the first capacitor C1 and the first switching tube, one end of the first capacitor C1 is connected with the first resistor R1 and the first switching tube, one end of the second resistor R2 is connected with the positive direct current voltage input end VCC, and the other end of the second resistor R2 is connected with the first switching tube and the first switching unit.
The drive circuit of the signal-free magnetic latching relay is further optimized: the first switch tube is arranged as an N-channel MOS tube Q1, the first switch unit is arranged as an N-channel MOS tube Q3, one end of the second resistor R2 is connected with the positive direct current voltage input end VCC, and the other end is connected with the drain electrode of the N-channel MOS tube Q1 and the grid electrode of the N-channel MOS tube Q3.
The drive circuit of the signal-free magnetic latching relay is further optimized: the driving circuit further comprises a first diode D1, sources of the first capacitor C1 and the N-channel MOS transistor Q1 are connected with an anode of the first diode D1, and a negative direct-current voltage input end VEE is connected with a cathode of the first diode D1.
The drive circuit of the signal-free magnetic latching relay is further optimized: the second control unit comprises a third resistor R3, a fourth resistor R4, a second capacitor C2 and a second switching tube, one end of the third resistor R3 is connected with the negative direct-current voltage input end VEE, the other end of the third resistor R3 is connected with the second capacitor C2 and the second switching tube, one end of the second capacitor C2 is connected with the third resistor R3 and the second switching tube, one end of the fourth resistor R4 is connected with the negative direct-current voltage input end VEE, and the other end of the fourth resistor R4 is connected with the second switching tube and the second switching unit.
The drive circuit of the signal-free magnetic latching relay is further optimized: the second switch tube is arranged as an N-channel MOS tube Q2, the second switch unit is arranged as an N-channel MOS tube Q4, one end of the fourth resistor R4 is connected with the negative direct current voltage input end VEE, and the other end is connected with the drain electrode of the N-channel MOS tube Q2 and the grid electrode of the N-channel MOS tube Q4.
The drive circuit of the signal-free magnetic latching relay is further optimized: the driving circuit further comprises a second diode D2, the second capacitor C2 and the source electrode of the N-channel MOS transistor Q2 are connected with the anode of the second diode D2, and the positive direct-current voltage input end VCC is connected with the cathode of the second diode D2.
The beneficial effects are that: according to the utility model, the working states of the magnetic latching relay are switched by changing the on-off states of the first switch unit and the second switch unit, the first control unit is used for receiving positive direct current voltage, the first switch unit is controlled to be on-off according to the positive direct current voltage, the second control unit is used for receiving negative direct current voltage, and the second switch unit is controlled to be on-off according to the negative direct current voltage, so that the circuit can complete driving of the magnetic latching relay only by supplying positive direct current or negative direct current to a power end, a special driving circuit and a control circuit are not required to be added, and meanwhile, the relay coil is not required to be supplied with larger current for a long time to ensure the closing or opening of the relay, so that the complexity of the whole control process is reduced.
Drawings
FIG. 1 is a schematic illustration of the present utility model;
FIG. 2 is a schematic circuit diagram of the present utility model;
Fig. 3 is a schematic diagram of an NPN transistor according to the present utility model.
Detailed Description
The technical solutions of the present utility model will be further described in detail with reference to specific embodiments, and the parts of the following embodiments of the present utility model, which are not specifically described and disclosed in detail, should be understood as existing technologies known or should be known to those skilled in the art, such as the type of magnetic latching relay.
As shown in fig. 1-2, a signal-free magnetic latching relay driving circuit includes: the magnetic latching relay comprises a first switch unit, a second switch unit, a first control unit and a second control unit, wherein the first switch unit and the second switch unit are used for switching the working state of the magnetic latching relay by changing the on-off state, the first control unit is used for receiving positive direct current voltage and controlling the on-off of the first switch unit according to the positive direct current voltage, and the second control unit is used for receiving negative direct current voltage and controlling the on-off of the second switch unit according to the negative direct current voltage.
The first control unit comprises a first resistor R1, a second resistor R2, a first capacitor C1 and a first switching tube, one end of the first resistor R1 is connected with a positive direct current voltage input end VCC, the other end of the first resistor R1 is connected with the first capacitor C1 and the first switching tube, one end of the first capacitor C1 is connected with the first resistor R1 and the first switching tube, one end of the second resistor R2 is connected with the positive direct current voltage input end VCC, and the other end of the second resistor R2 is connected with the first switching tube and the first switching unit.
The first switch tube is arranged as an N-channel MOS tube Q1, the first switch unit is arranged as an N-channel MOS tube Q3, one end of the second resistor R2 is connected with the positive direct current voltage input end VCC, and the other end is connected with the drain electrode of the N-channel MOS tube Q1 and the grid electrode of the N-channel MOS tube Q3.
The driving circuit further comprises a first diode D1, sources of the first capacitor C1 and the N-channel MOS transistor Q1 are connected with an anode of the first diode D1, and a negative direct-current voltage input end VEE is connected with a cathode of the first diode D1. When a negative dc voltage is applied, the diode D1 prevents the MOS transistor Q3 from being turned on.
The second control unit comprises a third resistor R3, a fourth resistor R4, a second capacitor C2 and a second switching tube, one end of the third resistor R3 is connected with the negative direct-current voltage input end VEE, the other end of the third resistor R3 is connected with the second capacitor C2 and the second switching tube, one end of the second capacitor C2 is connected with the third resistor R3 and the second switching tube, one end of the fourth resistor R4 is connected with the negative direct-current voltage input end VEE, and the other end of the fourth resistor R4 is connected with the second switching tube and the second switching unit.
The second switch tube is arranged as an N-channel MOS tube Q2, the second switch unit is arranged as an N-channel MOS tube Q4, one end of the fourth resistor R4 is connected with the negative direct current voltage input end VEE, and the other end is connected with the drain electrode of the N-channel MOS tube Q2 and the grid electrode of the N-channel MOS tube Q4.
The driving circuit further comprises a second diode D2, the second capacitor C2 and the source electrode of the N-channel MOS transistor Q2 are connected with the anode of the second diode D2, and the positive direct-current voltage input end VCC is connected with the cathode of the second diode D2. When the positive dc voltage is applied, the diode D2 prevents the MOS transistor Q4 from being turned on.
When the positive direct current voltage is supplied to the positive direct current voltage input end VCC, the grid voltage of the N-channel MOS tube Q3 is the power supply voltage, the N-channel MOS tube Q3 is conducted, the power supply flows through the coil of the magnetic latching relay and the body diode of the N-channel MOS tube Q4 through the N-channel MOS tube Q3, and finally flows to the negative end of the power supply, and the magnetic latching relay performs action switching. Meanwhile, a power supply charges the capacitor C1 through the resistor R1, the charging time is determined by the size of the resistor R1 and the size of the capacitor C1, when the voltage at two ends of the capacitor C1 is charged to the conducting voltage Uth of the N-channel MOS transistor Q1, the N-channel MOS transistor Q1 is conducted, the grid voltage of the N-channel MOS transistor Q3 is pulled to the forward conducting voltage drop of the first diode D1, the N-channel MOS transistor Q3 is cut off, no current flows through the N-channel MOS transistor Q3, the magnetic latching relay and the body diode of the N-channel MOS transistor Q4, and the magnetic latching relay completes the action switching. According to different conditions, the charging time constant of RC of the capacitor C1 of the resistor R1 can be adjusted to set the power-on time of the coil of the magnetic latching relay, so that the magnetic latching relay can reliably complete switching of the switching action.
When negative direct current voltage is supplied to the negative direct current voltage input end VEE, the grid voltage of the N-channel MOS transistor Q4 is positive power supply voltage, the N-channel MOS transistor Q4 is conducted, a power supply flows through the coil of the magnetic latching relay and the body diode of the N-channel MOS transistor Q3 through the N-channel MOS transistor Q4, and finally flows to the negative end of the power supply, and the magnetic latching relay performs action switching. Meanwhile, a power supply charges a capacitor C2 through a resistor R3, the charging time is determined by the size of the resistor R3 and the size of the capacitor C2, when the voltage at two ends of the capacitor C2 is charged to the conducting voltage Uth of an N-channel MOS tube Q2, the N-channel MOS tube Q2 is conducted, the grid voltage of an N-channel MOS tube Q4 is pulled to the forward conducting voltage drop of a second diode D2, the N-channel MOS tube Q4 is cut off, at the moment, no current flows through the N-channel MOS tube Q4, a magnetic latching relay and a body diode of the N-channel MOS tube Q3, the magnetic latching relay finishes action switching, and according to different conditions, the charging time constant of RC of the capacitor C2 of the resistor R3 can be adjusted to set the energizing time of a coil of the magnetic latching relay, so that the switching of the switching action of the magnetic latching relay is reliably completed.
As shown in fig. 3, the N-channel MOS transistor Q1 and the N-channel MOS transistor Q2 may be replaced by NPN transistors, which can achieve the same effect in the same way, and are not described here again.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A signal-free magnetic latching relay driving circuit, comprising: the first switch unit, the second switch unit, the first control unit and the second control unit;
the first switch unit and the second switch unit are used for switching the working state of the magnetic latching relay by changing the on-off state;
The first control unit is used for receiving the positive direct current voltage and controlling the on-off of the first switch unit according to the positive direct current voltage;
and the second control unit is used for receiving the negative direct current voltage and controlling the on-off of the second switch unit according to the negative direct current voltage.
2. The signal-free magnetic latching relay driving circuit according to claim 1, wherein the first control unit comprises a first resistor R1, a second resistor R2, a first capacitor C1 and a first switching tube, one end of the first resistor R1 is connected to the positive dc voltage input terminal VCC, the other end is connected to the first capacitor C1 and the first switching tube, one end of the first capacitor C1 is connected to the first resistor R1 and the first switching tube, one end of the second resistor R2 is connected to the positive dc voltage input terminal VCC, and the other end is connected to the first switching tube and the first switching unit.
3. The signal-free magnetic latching relay driving circuit according to claim 2, wherein the first switching tube is an N-channel MOS tube Q1, the first switching unit is an N-channel MOS tube Q3, one end of the second resistor R2 is connected to the positive dc voltage input terminal VCC, and the other end is connected to the drain of the N-channel MOS tube Q1 and the gate of the N-channel MOS tube Q3.
4. A signal-free magnetic latching relay driving circuit according to claim 3, wherein the driving circuit further comprises a first diode D1, the source of the first capacitor C1 and the N-channel MOS transistor Q1 are connected to the anode of the first diode D1, and the negative dc voltage input VEE is connected to the cathode of the first diode D1.
5. The signal-free magnetic latching relay driving circuit according to claim 1, wherein the second control unit comprises a third resistor R3, a fourth resistor R4, a second capacitor C2 and a second switching tube, wherein one end of the third resistor R3 is connected to the negative dc voltage input terminal VEE, the other end is connected to the second capacitor C2 and the second switching tube, one end of the second capacitor C2 is connected to the third resistor R3 and the second switching tube, one end of the fourth resistor R4 is connected to the negative dc voltage input terminal VEE, and the other end is connected to the second switching tube and the second switching unit.
6. The signal-free magnetic latching relay driving circuit according to claim 5, wherein the second switching tube is an N-channel MOS tube Q2, the second switching unit is an N-channel MOS tube Q4, one end of the fourth resistor R4 is connected to the negative dc voltage input terminal VEE, and the other end is connected to the drain of the N-channel MOS tube Q2 and the gate of the N-channel MOS tube Q4.
7. The signal-free magnetic latching relay driving circuit according to claim 6, wherein the driving circuit further comprises a second diode D2, the second capacitor C2 and the source of the N-channel MOS transistor Q2 are connected to the anode of the second diode D2, and the positive dc voltage input terminal VCC is connected to the cathode of the second diode D2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323267709.1U CN221508049U (en) | 2023-12-01 | 2023-12-01 | Signal-free magnetic latching relay driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323267709.1U CN221508049U (en) | 2023-12-01 | 2023-12-01 | Signal-free magnetic latching relay driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221508049U true CN221508049U (en) | 2024-08-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323267709.1U Active CN221508049U (en) | 2023-12-01 | 2023-12-01 | Signal-free magnetic latching relay driving circuit |
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|---|---|
| CN (1) | CN221508049U (en) |
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2023
- 2023-12-01 CN CN202323267709.1U patent/CN221508049U/en active Active
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