CN221947029U - Relay driving circuit and electronic device - Google Patents
Relay driving circuit and electronic device Download PDFInfo
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- CN221947029U CN221947029U CN202420010811.9U CN202420010811U CN221947029U CN 221947029 U CN221947029 U CN 221947029U CN 202420010811 U CN202420010811 U CN 202420010811U CN 221947029 U CN221947029 U CN 221947029U
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- 239000003990 capacitor Substances 0.000 claims abstract description 86
- 238000004146 energy storage Methods 0.000 claims abstract description 56
- 238000007599 discharging Methods 0.000 claims description 16
- 239000004020 conductor Substances 0.000 claims description 11
- 238000004353 relayed correlation spectroscopy Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The application relates to a relay driving circuit and electronic equipment, wherein the relay driving circuit comprises a first switch module, a second switch module, a delay module, an energy storage capacitor and a charging resistor, when the second switch module is conducted, the delay module provides bias for a control end of the first switch module to enable the first switch module to be conducted, and transmits a power supply voltage to a second end of the energy storage capacitor, so that the energy storage capacitor supplies power to a relay coil twice as much as the power supply voltage, the relay consumes the energy of the energy storage capacitor to change the switch state, and the speed of changing the switch state is improved; after the preset time length is reached, the delay module withdraws the bias, the first switch module is turned off, the energy storage capacitor with energy consumed is restored to be charged, and the charging is started in the state that the relay changes the switch state, so that the speed of changing the switch state next time is increased, and the time interval of changing the switch state by the relay is greatly shortened.
Description
Technical Field
The application belongs to the technical field of power electronics, and particularly relates to a relay driving circuit and electronic equipment.
Background
In the power supply product, the relay is used as a mechanical structure device on the board, the opening speed and the opening time interval of the relay relate to the performance parameters of the product, and the service life of the relay determines the service life of the product.
In the traditional scheme, the relay drives voltages to be always arranged at two ends of a charging resistor of an energy storage capacitor during the switching-on period of the relay, and additional loss is always generated; the energy storage capacitor can be recharged only after the relay is disconnected, and the relay can be turned on next time after the energy storage capacitor is charged, so that the relay is turned on for too long.
Disclosure of utility model
The application aims to provide a relay driving circuit and electronic equipment, and aims to solve the problems that in the related art, extra loss is always generated in a charging resistor of an energy storage capacitor, and the turn-on time interval of a relay is too long.
In a first aspect, an embodiment of the present application provides a relay driving circuit, connected to a relay coil, including a first switch module, a second switch module, a delay module, an energy storage capacitor, and a charging resistor, where:
The first end of the energy storage capacitor and the first end of the relay coil are connected with power supply voltage, and the second end of the energy storage capacitor is grounded through the charging resistor;
The first switch module is connected with the power supply voltage and the second end of the energy storage capacitor, and is used for enabling the voltage of the first end of the energy storage capacitor to be twice as high as the power supply voltage when the power supply voltage is transmitted to the second end of the energy storage capacitor;
The delay module is connected with the control end of the first switch module and the power supply voltage, and is used for charging under the condition that the second switch module is conducted, so that bias is provided for the control end of the first switch module, the bias is withdrawn after a preset time length is reached, and discharging is performed under the condition that the second switch module is turned off.
In one embodiment, the delay module includes a bias resistor connected between the first end and the control end of the first switch module and a first capacitor connected between the control end of the first switch module and the first end of the second switch module.
In one embodiment, the first switching module includes a first switching tube, a first end of the first switching tube is connected to the supply voltage, and a second end of the first switching tube is connected to the second end of the energy storage capacitor.
In one embodiment, the second switching module includes a second switching tube, a first end of the second switching tube is connected to the delay module and a first end of the relay coil, and a second end of the second switching tube is grounded.
In one embodiment, the second switch module further includes a first voltage divider and a second voltage divider, the first voltage divider is connected in series with the control end of the second switch tube, and the second voltage divider is connected between the control end and the second end of the second switch tube.
In one embodiment, the relay further comprises a first unidirectional conductor, wherein the input end of the first unidirectional conductor is connected with the power supply voltage, the first switch module and the delay module, and the output end of the first unidirectional conductor is connected with the first end of the relay coil.
In one embodiment, the relay further comprises a discharging module, wherein the discharging module is connected with the delay module and the first end of the relay coil, and is used for discharging electric quantity of the delay module to the relay coil under the condition that the second switch module is turned off.
In one embodiment, the discharging module includes a second unidirectional conductor, an input of the second unidirectional conductor is connected to the first capacitor, and an output of the second unidirectional conductor is connected to the first end of the relay coil.
In one embodiment, the relay further comprises a third unidirectional conductor, and the second unidirectional conductor is in anti-parallel connection with the relay coil.
In a second aspect, an embodiment of the present application further provides an electronic device, including a relay and a relay driving circuit as described above.
Compared with the related art, the embodiment of the application has the beneficial effects that: the relay driving circuit provided by the embodiment of the application comprises a first switch module, a second switch module, a delay module, an energy storage capacitor and a charging resistor, wherein when the second switch module is conducted, the delay module provides bias for the control end of the first switch module to enable the first switch module to be conducted, and transmits power supply voltage to the second end of the energy storage capacitor, so that the energy storage capacitor is twice as high as the power supply voltage to supply power to the relay coil, the relay consumes the energy of the energy storage capacitor to change the switch state, and the speed of changing the switch state is improved; after the preset time length is reached, the delay module withdraws the bias, the first switch module is turned off, the energy storage capacitor with energy consumed is restored to be charged, and the charging is started in the state that the relay changes the switch state, so that the speed of changing the switch state next time is increased, and the time interval of changing the switch state by the relay is greatly shortened; in addition, the charging resistor only generates loss during the conduction period of the energy storage capacitor charging device and the first switch module, and no loss is generated after the energy storage capacitor is fully charged, so that the impedance of the charging resistor can be reduced during the type selection, the charging speed of the energy storage capacitor can be increased, and the time interval for changing the switch state of the relay is further shortened. When the second switch module is turned off, the delay module starts discharging, and the time interval for changing the switch state of the relay is further shortened.
Drawings
Fig. 1 is a schematic block diagram of a relay driving circuit according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a relay driving circuit according to an embodiment of the application.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
As shown in fig. 1, an embodiment of the present application provides a relay driving circuit connected to a relay coil 101, where the relay driving circuit includes a first switch module 210, a second switch module 220, a delay module 230, an energy storage capacitor C0, and a charging resistor R1.
The first end of the energy storage capacitor C0 and the first end of the relay coil 101 are connected with the power supply voltage, and the second end of the energy storage capacitor C0 is grounded through the charging resistor R1. It will be appreciated that the relay driver circuit is provided with a supply input for switching in the supply voltage VCC.
The first switch module 210 is connected to the supply voltage VCC and the second end of the storage capacitor C0, and is configured to transmit the supply voltage VCC to the second end of the storage capacitor C0, so that the voltage at the first end of the storage capacitor C0 is twice the supply voltage VCC. It can be appreciated that the energy storage capacitor C0 can be charged to the voltage of the power supply voltage VCC after the power supply voltage VCC is powered up, and when the first switch module 210 transmits the power supply voltage VCC to the second end of the energy storage capacitor C0, the voltage of the first end of the energy storage capacitor C0 is doubled compared with the power supply voltage VCC based on the principle that the voltage at the two ends of the capacitor cannot be suddenly changed, so that the speed of changing the switch state (for example, changing the normally open contact from open to close, or changing the normally closed contact from close to open) is increased.
The delay module 230 is connected to the control end of the first switch module 210 and the supply voltage VCC, and the delay module 230 is configured to charge when the second switch module 220 is turned on, to provide bias to the control end of the first switch module 210 first, to cancel the bias after reaching a preset time period, and to discharge when the second switch module 220 is turned off. It can be appreciated that, during the charging start period, the delay module 230 loads the voltage (i.e. bias) of the control terminal of the first switch module 210 below the threshold voltage of the first switch module 210, and the first switch module 210 is turned on; continuing the charging, when the voltage recorded at the control terminal of the first switch module 210 exceeds the threshold voltage of the first switch module 210, the first switch module 210 is turned off.
Specifically, the energy storage capacitor C0 is an electrolytic capacitor or a super capacitor, and the first end is a positive electrode and the second end is a negative electrode.
When the second switch module 220 is turned on, the delay module 230 provides a bias to the control end of the first switch module 210 to enable the first switch module 210 to be turned on, and transmits the power supply voltage VCC to the second end of the energy storage capacitor C0, so that the first end (positive electrode) of the energy storage capacitor C0 is twice as high as the power supply voltage VCC to supply power to the relay coil 101, the relay 10 consumes the energy of the energy storage capacitor C0 to change the switch state, and the speed of changing the switch state is increased; after reaching the preset duration, the delay module 230 withdraws the bias provided to the first switch module 210, the first switch module 210 is turned off, the energy storage capacitor C0, the energy of which is already consumed (at this time, the first end voltage of the energy storage capacitor C0 is restored to the power supply voltage VCC), resumes the charging, and starts the charging in the state that the relay 10 changes the switching state, thereby accelerating the next speed of changing the switching state, and greatly shortening the time interval that the relay 10 changes the switching state. The preset duration of the bias is provided depends on the charge rate of the delay module 230.
It should be noted that, the charging resistor R1 generates loss only during the period when the charging device of the energy storage capacitor C0 and the first switch module 210 are turned on, and when the relay 10 changes the switch state, since the first switch module 210 can be turned off, the charging resistor R1 does not generate loss after the energy storage capacitor C0 is fully charged, so that the impedance of the charging resistor R1 can be reduced during the type selection, so that the charging speed of the energy storage capacitor C0 can be increased, and the time interval for changing the switch state of the relay 10 is further shortened. In addition, when the second switching module 220 is turned off, the delay module 230 starts discharging, and the time interval for changing the switching state of the relay 10 can be further shortened.
In one embodiment, the first switch module 210 includes a first switch tube Q1, a first conducting end, a second conducting end and a control end of the first switch tube Q1 sequentially form a first end, a second end and a control end of the first switch module 210, the first end of the first switch module 210 is connected to the power supply input end, and the second end of the first switch module is connected to the second end of the energy storage capacitor C0. The first switch module 210 only needs one switch tube, and the circuit is simple and reliable and has low cost. The first switching tube Q1 is configured to transmit the supply voltage VCC to the second end of the energy storage capacitor C0, so that the first end of the energy storage capacitor C0 generates voltage doubling, and the speed of the relay 10 for changing the switching state is increased.
Referring to fig. 2, in one embodiment, the first switching tube Q1 includes: the source electrode, the drain electrode and the grid electrode of the P-channel MOS tube sequentially form a first conducting end, a second conducting end and a control end of the first switch tube Q1. It will be appreciated that in alternative embodiments, the first switching tube Q1 comprises: the emitter, collector and base of the PNP triode sequentially form a first conducting end, a second conducting end and a control end of the first switching tube Q1.
In one embodiment, the delay module 230 includes a bias resistor R2 and a first capacitor C1, the bias resistor R2 is connected between the first end and the control end of the first switch module 210, and the first capacitor C1 is connected between the control end of the first switch module 210 and the first end of the second switch module 220.
The second switch module 220 is connected to the delay module 230 and the RELAY coil 101, and a control end of the second switch module 220 is configured to receive a driving signal RELAY, where the driving signal RELAY is configured to drive the second switch module 220 to be turned on or turned off. When the second switch module 220 is turned on, a charging loop for charging the first capacitor C1 is formed between the power supply input terminal and the second terminal of the second switch module 220. Taking the first switching tube Q1 as an example, when the first capacitor C1 starts to charge, the bias resistor R2 is positive and negative on the potential (one end connected with the power supply input end), and generates bias between the gate and the source of the P-channel MOS tube, the gate-source voltage (Vgs) of the P-channel MOS tube is lower than the threshold voltage (Vth) of the P-channel MOS tube, the P-channel MOS tube is turned on, the first end of the energy storage capacitor C0 becomes twice the power supply voltage VCC, the relay 10 changes the switching state, the speed is increased, and the electric quantity of the energy storage capacitor C0 is consumed. When the first capacitor C1 is continuously charged and the gate-source voltage of the P-channel MOS transistor gradually rises to be higher than the threshold voltage, the P-channel MOS transistor is turned off, the voltage of the relay coil 101 is restored to the supply voltage VCC, the energy storage capacitor C0 starts to be recharged, and the charging resistor R1 does not generate any loss after the energy storage capacitor C0 is fully charged.
It can be understood that the above-mentioned predetermined period depends on the resistance of the bias resistor R2 and the capacitance of the first capacitor C1, and the magnitude of the bias resistor R2 determines the charging current, and determines the rising speed of the voltage of the first capacitor C1 (i.e. the rising speed of the voltage applied to the gate of the P-channel MOS transistor) simultaneously with the capacitance of the first capacitor C1. Accordingly, the suitable period of time for providing the bias can be adjusted by configuring the resistance value of the bias resistor R2 and the capacitance value of the first capacitor C1.
This greatly shortens the time interval for the relay 10 to change the switching state, based on the fact that the storage capacitor C0 has already been charged back in the case where the relay 10 also changes the switching state. In addition, in order to reduce the loss of the charging resistor R1, the resistance of the charging resistor R1 is relatively large in the conventional scheme, but this increases the charging time of the storage capacitor C0. In the technical solution of the embodiment of the present application, the charging resistor R1 only generates loss during the on period of the first switch module 210 and the charging period of the energy storage capacitor C0, so that the resistance value can be reduced, the charging speed of the energy storage capacitor C0 can be increased, and the time interval for changing the switch state of the relay 10 can be further shortened.
In one embodiment, the second switch module 220 includes a second switch tube Q2, where a first conducting end, a second conducting end, and a control end of the second switch tube Q2 sequentially form a first end, a second end, and a control end of the second switch module 220, and the first end of the second switch module 220 is connected to the delay module 230 and the first end of the relay coil 101, and the second end is grounded. The second switch module 220 only needs one switch tube, and the circuit is simple and reliable and has low cost. The second switching tube Q2 is used for controlling the relay 10 to change the switching state, and simultaneously controlling the on-off of the charging loop of the delay module 230, so that the energy storage capacitor C0 can double the voltage to drive the relay 10.
In one embodiment, the second switching tube Q2 includes an NPN transistor, where a collector, an emitter, and a base of the NPN transistor sequentially form a first conducting terminal, a second conducting terminal, and a control terminal of the second switching tube Q2. It will be appreciated that in some cases, NPN transistors may be replaced with N-channel MOS or IGBT transistors.
In one embodiment, the second switch module 220 further includes a first voltage divider R3 and a second voltage divider R4, the first voltage divider R3 is connected in series with the control terminal of the second switch module 220, and the second voltage divider R4 is connected between the control terminal and the second terminal of the second switch module 220.
It is understood that the first voltage divider R3 and the second voltage divider R4 may include a circuit formed by at least one of a resistor, an inductor, a capacitor, and a transistor.
In one embodiment, the relay driving circuit further includes a first unidirectional conductive device D2, an input terminal of the first unidirectional conductive device D2 is connected to the power supply input terminal, the first terminal of the first switch module 210, and the delay module 230, and an output terminal of the first unidirectional conductive device D2 is connected to the first terminal of the relay coil 101. The first unidirectional current collector D2 is configured to prevent the voltage at the first end of the storage capacitor C0 from flowing backward to the power supply input terminal, the first switch module 210, the delay module 230, and the like. The first unidirectional current collector D2 is, for example, a diode, or may be a triode, and is driven by the driving signal RELAY. When the first unidirectional current collector D2 is a diode, the input end and the output end are respectively the anode and the cathode of the diode.
In one embodiment, the relay driving circuit further includes a discharging module 240, and the discharging module 240 is connected to the delay module 230 and the first end of the relay coil 101, for discharging the electric quantity of the delay module 230 to the relay coil 101 when the second switch module 220 is turned off. It will be appreciated that the discharging module 240 is adapted to increase the discharging speed of the delay module 230, and further shorten the time interval for the relay 10 to change the switching state.
In one embodiment, the discharging module 240 includes a second unidirectional current collector D1, an input terminal of the second unidirectional current collector D1 is connected to the first capacitor C1, and an output terminal is connected to the first terminal of the relay coil 101. The second unidirectional current collector D1 is, for example, a diode, or may be a triode, and is driven by the driving signal RELAY. When the second unidirectional current collector D1 is a diode, the input end and the output end are respectively the anode and the cathode of the diode.
When the second switching module 220 is turned off, the second unidirectional guider D1 discharges to the relay coil 101 through the first unidirectional guider D2. In one example, since the first switching tube Q1 is a MOS tube, the resistance of the bias resistor R2 may be configured to be relatively large, and under the condition of keeping the same time constant, the capacitance of the first capacitor C1 may be set to be small, and the second unidirectional current collector D1 is added to form a discharge loop of the first capacitor C1 (before this, the bias resistor R2 can also consume the electric quantity of the first capacitor C1), so that the discharge time of the first capacitor C1 is extremely short, which is beneficial to the next change of the switching state of the relay 10.
In one embodiment, the relay driving circuit further includes a third unidirectional conductor D3, and the third unidirectional conductor D3 is connected in anti-parallel with the relay coil 101 to form a protection circuit of the relay coil 101. The power supply input end is also connected with a filter capacitor C3. The third unidirectional current collector D3 is, for example, a diode, and the input terminal and the output terminal are respectively the anode and the cathode of the diode.
In a second aspect, embodiments of the present application also provide an electronic device including the relay 10 and the relay driving circuit as above.
It will be appreciated that the electronic device is, for example, a relay 10 device, or a circuit board or electronic product to which the relay 10 is applied.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. The utility model provides a relay drive circuit, is connected with relay coil, its characterized in that includes first switch module, second switch module, time delay module, energy storage capacitor and charging resistor, wherein:
The first end of the energy storage capacitor and the first end of the relay coil are connected with power supply voltage, and the second end of the energy storage capacitor is grounded through the charging resistor;
The first switch module is connected with the power supply voltage and the second end of the energy storage capacitor, and is used for enabling the voltage of the first end of the energy storage capacitor to be twice as high as the power supply voltage when the power supply voltage is transmitted to the second end of the energy storage capacitor;
The delay module is connected with the control end of the first switch module and the power supply voltage, and is used for charging under the condition that the second switch module is conducted, so that bias is provided for the control end of the first switch module, the bias is withdrawn after a preset time length is reached, and discharging is performed under the condition that the second switch module is turned off.
2. The relay driver circuit of claim 1 wherein the delay module comprises a bias resistor and a first capacitor, the bias resistor connected between the first terminal and the control terminal of the first switch module, the first capacitor connected between the control terminal of the first switch module and the first terminal of the second switch module.
3. The relay driving circuit according to claim 1 or 2, wherein the first switching module includes a first switching tube, a first end of the first switching tube is connected to the power supply voltage, and a second end of the first switching tube is connected to the second end of the energy storage capacitor.
4. The relay driving circuit according to claim 1 or 2, wherein the second switching module includes a second switching tube, a first end of the second switching tube is connected to the delay module and the first end of the relay coil, and a second end of the second switching tube is grounded.
5. The relay driving circuit according to claim 4, wherein the second switching module further comprises a first voltage divider and a second voltage divider, the first voltage divider being connected in series with the control terminal of the second switching tube, the second voltage divider being connected between the control terminal and the second terminal of the second switching tube.
6. The relay driving circuit of claim 4, further comprising a first unidirectional inductor, wherein an input of the first unidirectional inductor is connected to the supply voltage, the first switching module, and the delay module, and an output of the first unidirectional inductor is connected to the first end of the relay coil.
7. The relay driving circuit according to claim 2, further comprising a discharging module connected to the delay module and the first end of the relay coil for discharging the electric quantity of the delay module to the relay coil in a case where the second switching module is turned off.
8. The relay driver circuit of claim 7 wherein the discharge module comprises a second unidirectional current collector having an input connected to the first capacitor and an output connected to the first end of the relay coil.
9. The relay driving circuit of claim 1, further comprising a third unidirectional conductor in anti-parallel with the relay coil.
10. An electronic device comprising a relay and the relay driving circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420010811.9U CN221947029U (en) | 2024-01-02 | 2024-01-02 | Relay driving circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420010811.9U CN221947029U (en) | 2024-01-02 | 2024-01-02 | Relay driving circuit and electronic device |
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| Publication Number | Publication Date |
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| CN221947029U true CN221947029U (en) | 2024-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202420010811.9U Active CN221947029U (en) | 2024-01-02 | 2024-01-02 | Relay driving circuit and electronic device |
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| CN (1) | CN221947029U (en) |
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- 2024-01-02 CN CN202420010811.9U patent/CN221947029U/en active Active
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