CN210925881U - Novel drive circuit of relay - Google Patents
Novel drive circuit of relay Download PDFInfo
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- CN210925881U CN210925881U CN201922397550.2U CN201922397550U CN210925881U CN 210925881 U CN210925881 U CN 210925881U CN 201922397550 U CN201922397550 U CN 201922397550U CN 210925881 U CN210925881 U CN 210925881U
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- 239000003990 capacitor Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000003111 delayed effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
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Abstract
The utility model relates to a novel drive circuit of a relay, which comprises a relay drive circuit; an LDC voltage-multiplying line; a drive delay line; the beneficial effects of the utility model reside in that: the scheme does not need a plurality of power supplies or complex control logic, provides a relay driving circuit, realizes the pull-in of the relay under the condition of coil rated voltage, and maintains the pull-in state under the condition of about half of the rated voltage.
Description
Technical Field
The utility model relates to a relay drive technical field especially relates to a novel drive circuit of relay.
Background
A relay is a device in which the contacts are controlled to close or open by a coil. Generally, in order to ensure reliable actuation of the relay, the relay needs to be actuated under rated voltage of a coil; in order to reduce the power consumption and heat generation of the relay coil, it is necessary to maintain the pull-in state at about half the rated coil voltage.
The existing relay driving circuits comprise the following types:
1. the rated voltage of the coil is directly used for attracting and maintaining, and the method has large loss during maintaining, so that the relay generates heat seriously. As shown in fig. 2.
2. The coil rated voltage is used for attracting, about half of the rated coil voltage is kept, and the method needs two paths of power supplies of the rated coil voltage and the half voltage, so that the cost and the circuit complexity are increased. As shown in fig. 3.
3. The coil rated voltage is used for closing the coil, after the coil is completely closed, a square wave voltage signal with the amplitude of the coil rated voltage and the duty ratio of about 50% is used for keeping, and the method is relatively complex in logic and difficult to achieve during control.
Disclosure of Invention
In order to overcome the comparatively complicated shortcoming of above needs multichannel power supply or control logic, the utility model provides a half-voltage power supply is through the circuit of the back direct drive relay that steps up, can realize only using single-channel power supply and simple drive signal, realizes that the relay actuation under coil rated voltage and maintains the actuation state under about half rated coil voltage condition.
The utility model discloses a realize through following technical scheme: design a novel drive circuit of relay, its characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the relay driving circuit comprises a relay RY1, a relay driving switch tube Q2 and a relay driving signal end;
the LDC voltage-multiplying circuit comprises a half-voltage power supply with the voltage slightly higher than half of the rated voltage of a relay coil, an inductor L1, a diode D1, a switching tube Q1 and a capacitor C1, wherein the half-voltage power supply charges the capacitor C1 through L1, D1 and Q1;
a drive delay line; wherein,
the initial end of the drive delay line is connected with the relay drive output end, the two ends of a tap are connected to a relay drive switching tube Q2, and the tail end of the drive delay line is grounded;
the initial end of the LDC voltage-multiplying circuit is connected with a half-voltage power supply, the tail end of the LDC voltage-multiplying circuit is grounded, and the switching tube Q1 is connected with the relay driving signal output end of the relay driving circuit.
Further, the relay driving circuit comprises a relay RY1, a relay driving switch tube Q2 and a relay driving signal end; one end of the relay RY1 is connected to C1 of the LDC voltage-doubling circuit, and the other end thereof is connected to the relay drive switching tube Q2.
Further, the switching tube Q1 and the relay driving switching tube Q2 are various switching tubes including but not limited to MOS, IGBT or triode.
Furthermore, the delay time of the drive delay circuit needs to be longer than 1/2 of the resonant period of the LDC voltage-multiplying circuit, so that the delay time of the drive delay circuit is delayed by the relay drive switch tube Q2 and is switched on by the LDC voltage-multiplying circuit switch tube Q1.
Furthermore, a delay circuit is driven, a delay capacitor C2 is connected in series with the resistor R1 respectively to form an RC delay loop, the initial end of the RC delay circuit is connected to the relay drive output end, two ends of a tap of the delay capacitor C2 are connected to the relay drive switch tube Q2, and the tail end of the RC delay circuit is grounded.
Further, the delay time of the driving delay line is determined by the time constants of the resistor R1 and the capacitor C1.
The beneficial effects of the utility model reside in that: the circuit for directly driving the relay after the voltage of the half-voltage power supply is boosted is provided, and the purposes that the relay is attracted under the rated voltage and the attraction state is kept under the half-voltage condition can be achieved by using only a single half-voltage power supply.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a circuit schematic of prior art 1.
Fig. 3 is a circuit schematic of prior art 2.
Detailed Description
The technical solution of the present invention is further explained below with reference to the accompanying drawings, which are believed to be clear to those skilled in the art.
< example >
Taking a half-voltage power supply of +7V as an example, as shown in fig. 1, when the relay driving signal is set high, Q1 is turned on first due to the delay lines R1 and C2, and +7V charges C1 through L1, D1 and Q1. Ideally, the final voltage of C1 is + 14V. The actual D1 has a voltage drop VD1, Q1 has a voltage drop VQ1, and the voltage of C1 is VC1 ═ V (14-VD1-VQ 1).
After R1 and C2 delay, Q2 is conducted, the relay starts to be closed under the voltage of VC1 until the voltage of VC1 drops to + (7-VD1-VQ1) V, and the relay keeps a conducting state under the voltage until the relay driving signal is set to be low.
A novel drive circuit of relay, its characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the relay driving circuit comprises a relay RY1, a relay driving switch tube Q2, a relay driving diode D2 and a relay driving signal end; the relay driving circuit comprises a relay RY1, a relay driving switch tube Q2 and a relay driving signal end; one end of the relay RY1 is connected to C1 of the LDC voltage-doubling circuit, and the other end thereof is connected to the relay drive switching tube Q2.
The LDC voltage-multiplying circuit adopts an inductor L1, a diode D1, a switching tube Q1 and a capacitor C1 to charge the capacitor C1;
the driving delay circuit is formed by connecting a delay capacitor C2 with a resistor R1 in series respectively to form an RC delay circuit; wherein,
the initial end of the RC delay circuit is connected to the relay drive output end, the two ends of a tap of a delay capacitor C2 are connected to a relay drive switching tube Q2, and the tail end of the RC delay circuit is grounded;
the initial end of the LDC voltage-multiplying line is connected with +7V voltage, the tail end of the LDC voltage-multiplying line is grounded, and the switch tube Q1 is connected with the relay drive signal output end of the relay drive line.
< modification 1>
The driving delay circuit can also be replaced by any other driving circuit which can realize the delayed opening, such as an additional I/O port for sending driving, and a CPU for sending a driving signal for driving the switching tube to be opened in a delayed manner.
< modification 2>
The switch tube Q1 and the relay driving switch tube Q2 are various switch tubes including but not limited to MOS, IGBT or triode.
Claims (6)
1. A novel drive circuit of a relay is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the relay driving circuit comprises a relay RY1, a relay driving switch tube Q2 and a relay driving signal end;
the LDC voltage-multiplying circuit comprises a half-voltage power supply with the voltage slightly higher than half of the rated voltage of a relay coil, an inductor L1, a diode D1, a switching tube Q1 and a capacitor C1, wherein the half-voltage power supply charges the capacitor C1 through L1, D1 and Q1;
a drive delay line; wherein,
the initial end of the drive delay line is connected with the relay drive output end, the two ends of a tap are connected to a relay drive switching tube Q2, and the tail end of the drive delay line is grounded;
the initial end of the LDC voltage-multiplying circuit is connected with a half-voltage power supply, the tail end of the LDC voltage-multiplying circuit is grounded, and the switching tube Q1 is connected with the relay driving signal output end of the relay driving circuit.
2. A novel drive circuit for a relay according to claim 1, characterized in that: one end of the relay RY1 of the relay driving circuit is connected to C1 of the LDC voltage-multiplying circuit, and the other end of the relay RY1 of the relay driving circuit is connected to a relay driving switch tube Q2.
3. A novel drive circuit for a relay according to claim 1 or 2, characterized in that: the switch tube Q1 and the relay driving switch tube Q2 are various switch tubes including but not limited to MOS, IGBT or triode.
4. A novel drive circuit for a relay according to claim 1, characterized in that: the drive delay circuit enables the relay drive switch tube Q2 to delay and the LDC voltage-multiplying circuit switch tube Q1 to be switched on, and the delay time of the drive delay circuit needs to be longer than 1/2 of the resonance period of the LDC voltage-multiplying circuit.
5. A novel drive circuit for a relay according to claim 1, characterized in that: the relay drive circuit comprises a drive delay circuit, wherein a delay capacitor C2 and a resistor R1 are respectively connected in series to form an RC delay loop, the initial end of the RC delay circuit is connected to the relay drive output end, the two ends of a tap of a delay capacitor C2 are connected to a relay drive switch tube Q2, and the tail end of the RC delay circuit is grounded.
6. The novel drive circuit for a relay according to claim 5, characterized in that: the delay time of the driving delay circuit is determined by the time constants of the resistor R1 and the capacitor C1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922397550.2U CN210925881U (en) | 2019-12-26 | 2019-12-26 | Novel drive circuit of relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922397550.2U CN210925881U (en) | 2019-12-26 | 2019-12-26 | Novel drive circuit of relay |
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| Publication Number | Publication Date |
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| CN210925881U true CN210925881U (en) | 2020-07-03 |
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| CN201922397550.2U Active CN210925881U (en) | 2019-12-26 | 2019-12-26 | Novel drive circuit of relay |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110867344A (en) * | 2019-12-26 | 2020-03-06 | 江苏为恒智能科技有限公司 | Novel driving circuit of relay and driving method thereof |
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2019
- 2019-12-26 CN CN201922397550.2U patent/CN210925881U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110867344A (en) * | 2019-12-26 | 2020-03-06 | 江苏为恒智能科技有限公司 | Novel driving circuit of relay and driving method thereof |
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