CN110729771A - Self-powered device - Google Patents
Self-powered device Download PDFInfo
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- CN110729771A CN110729771A CN201911031982.XA CN201911031982A CN110729771A CN 110729771 A CN110729771 A CN 110729771A CN 201911031982 A CN201911031982 A CN 201911031982A CN 110729771 A CN110729771 A CN 110729771A
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- rectifying circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Dc-Dc Converters (AREA)
Abstract
The invention belongs to the technical field of relay protection, and particularly relates to a self-powered device. The device comprises a CT, a rectifying circuit and an energy storage circuit which are connected in sequence; the surge protection circuit comprises a thermistor, a TVS tube and a piezoresistor which are connected in series, the TVS tube and the piezoresistor which are connected in series are connected with the alternating current end of the rectifying circuit in parallel, and the thermistor is connected with the direct current end of the rectifying circuit in parallel. The anti-surge circuit can protect the self-powered circuit when the secondary current output by the CT is larger than the peak current of the steady-state current, so that instant burning is prevented. Compare in the traditional only single parallelly connected piezo-voltage of interchange end at rectifier circuit, this prevent surge circuit with TVS pipe and piezo-resistor series connection, prevent that the piezo-resistor is in the conducting state for a long time to protect piezo-resistor, both compensate each other, improve whole self-power supply unit's stability. Meanwhile, the device can provide a stable and reliable multi-channel power supply for devices such as a relay protection device of a power grid and a circuit breaker operation loop.
Description
Technical Field
The invention belongs to the technical field of relay protection, and particularly relates to a self-powered device.
Background
Conventional relay protection devices all need working power supplies, such as a UPS (uninterrupted power supply), a direct current screen, a PT (potential transformer) cabinet and the like, so that the field cost is increased, the complexity of a system is increased, the construction difficulty is increased in use, and certain cost is increased in maintenance. Moreover, if a direct current panel or a sustainable power supply such as a UPS is not configured on site, if a line or a device fails, the operation power supply of the relay protection device and the circuit breaker is lost, and the relay protection function cannot be applied.
In order to solve the above problems, a self-powered apparatus has been developed. The energy of the working power supply of the self-powered protection device is taken from the current transformer CT, and the electric energy is collected from the CT equipment to be used as the working power supply of equipment such as a protection device and a circuit breaker, so that the equipment can work and realize relay protection without an auxiliary power supply, and the power supply device of the self-powered protection device is particularly important.
For example, chinese utility model patent with publication number CN205724825U discloses a self-powered circuit, which comprises an external current transformer, a large current bleeder circuit, a rectifier circuit and a working circuit connected in sequence. In the circuit, at the moment of circuit connection, the secondary current output by the current transformer is easy to generate peak current or overload current which is larger than steady-state current, so that the whole self-powered circuit is easy to burn out instantly. And the circuit has no specific application circuit scheme and implementation principle such as a 5V power supply of a processor and the like and a storage circuit of a release.
Disclosure of Invention
The invention provides a self-powered device, which is used for solving the problem that a current transformer in the prior art is easy to output peak current or overload current so that the whole self-powered device is burnt out instantly.
In order to solve the technical problems, the technical scheme and the beneficial effects of the invention are as follows:
the invention discloses a self-powered device, which comprises a current transformer, a rectifying circuit and an energy storage circuit which are connected in sequence; the anti-surge circuit comprises a thermistor, a transient voltage suppression diode and a piezoresistor which are connected in series, wherein the transient voltage suppression diode and the piezoresistor which are connected in series are connected with the alternating current end of the rectifying circuit in parallel, and the thermistor is connected with the direct current end of the rectifying circuit in parallel.
The beneficial effects are as follows: the self-powered device is provided with an anti-surge circuit, wherein the anti-surge circuit comprises a thermistor, a transient voltage suppression diode and a piezoresistor which are connected in series, the transient voltage suppression diode and the piezoresistor which are connected in series are connected with the alternating current end of the rectifying circuit in parallel, and the thermistor is connected with the direct current end of the rectifying circuit in parallel. The anti-surge circuit is arranged, so that the whole self-power circuit can be protected when the secondary current output by the current transformer is larger than the peak current or overload current of the steady-state current, and instant burning is prevented. The thermistor is used as a backup protection of the rectifier circuit after power taking, and the device can be further prevented from being damaged due to overcurrent. Compared with the traditional single voltage-sensitive voltage which is connected in parallel at the alternating current end of the rectifying circuit, the surge prevention circuit has the advantages that the transient voltage suppression diode and the voltage-sensitive resistor are connected in series, the voltage-sensitive resistor is prevented from being in a conducting state for a long time to protect the voltage-sensitive resistor, and the voltage-sensitive resistor are compensated with each other to improve the stability of the whole self-powered device.
Furthermore, in order to prevent the current transformer from generating high voltage and secondary open circuit, a discharge circuit is also arranged between the rectifying circuit and the energy storage circuit, the discharge circuit comprises a first optocoupler, a first switch tube and a first voltage-stabilizing tube, the primary sides of the first voltage-stabilizing tube and the first optocoupler are connected in series and then are connected in parallel with the direct current end of the rectifying circuit, and the cathode of the first voltage-stabilizing tube is connected with the anode of the direct current end of the rectifying circuit; one end of the first optical coupler secondary side is connected with the positive electrode of the direct current end of the rectifying circuit, and the other end of the first optical coupler secondary side is connected with the control end of the first switching tube; the input end of the first switching tube is connected with the positive pole of the direct current end of the rectifying circuit, and the output end of the first switching tube is connected with the negative pole of the direct current end of the rectifying circuit.
Furthermore, in order to prevent the charging current for charging the energy storage circuit from reversing, a reverse diode is connected in series between the rectifying circuit and the energy storage circuit, and the anode of the reverse diode is connected with the anode of the direct current end of the rectifying circuit.
Furthermore, in order to ensure the output precision and stability of the self-powered device, a second voltage regulator tube and a first resistor are connected in series between the other end of the secondary side of the first optocoupler and the control end of the first switch tube, and the anode of the second voltage regulator tube is used for being connected with the control end of the first switch tube.
Furthermore, in order to control the conduction time of the first switch tube and provide overvoltage protection for the first switch tube, a first capacitor and a third voltage-stabilizing tube are connected between the serial connection point of the second voltage-stabilizing tube and the first resistor and the negative electrode of the direct-current end of the rectifying circuit, the first capacitor and the third voltage-stabilizing tube are connected in parallel, and the anode of the third voltage-stabilizing tube is connected with the negative electrode of the direct-current end of the rectifying circuit.
Furthermore, in order to realize power supply to loads of different voltage levels so as to improve the application range of the device, and to improve a stable and reliable multi-channel power supply for devices such as a relay protection device, a circuit breaker operation circuit, a line recording device and a fault indication device of a power grid, the device further comprises a voltage conversion circuit, wherein the input end of the voltage conversion circuit is connected with the output end of the energy storage circuit, and the voltage conversion circuit comprises at least one voltage conversion module for converting the voltage output by the energy storage circuit into different voltages to supply power to corresponding loads.
Furthermore, in order to realize the charging of the lithium battery and the reverse power supply under the condition that the electric quantity of the lithium battery is sufficient, the lithium battery charging device further comprises a voltage conversion circuit, wherein the voltage conversion circuit comprises a first voltage conversion module and a second voltage conversion module, the first voltage conversion module comprises a first voltage conversion chip, the input end of the first voltage conversion chip is connected with the output end of the energy storage circuit, and the output end of the first voltage conversion chip is used for being connected with the lithium battery; the second voltage conversion module comprises a second voltage conversion chip, a controller, a second optocoupler and a key switch, wherein the input end of the second voltage conversion chip is used for connecting a lithium battery, the primary side of the second optocoupler is connected with the controller, one end of the secondary side of the second optocoupler is connected with the input end of the second voltage conversion chip, the other end of the secondary side of the second optocoupler is connected with the enabling end of the second voltage conversion chip, one end of the key switch is connected with the input end of the second voltage conversion chip, and the other end of the key switch is connected with the enabling end of the second voltage conversion chip.
Drawings
FIG. 1 is an overall block circuit diagram of the self-powered device of the present invention;
fig. 2 is a circuit diagram of an anti-surge circuit, a rectifier circuit and a bleed circuit of the self-powered device of the present invention;
fig. 3 is a circuit diagram of a first voltage conversion module, a second voltage conversion module, and a third voltage conversion module of the self-powered device of the present invention;
fig. 4 is a circuit diagram of a fourth voltage conversion module of the self-powered device of the present invention.
Detailed Description
Self-powered device embodiments:
the embodiment provides a self-powered device, namely a power supply source of the self-powered protection device, and the whole circuit block diagram of the self-powered protection device is shown in fig. 1. The device comprises a current transformer, a rectifying circuit, a bleeder circuit, an energy storage capacitor (which can be an energy storage circuit of other types) and a voltage conversion circuit which are connected in sequence. The device converts alternating current taken from a current transformer into direct current through a rectifying circuit, the rectifying circuit outputs pulsating direct current to charge an energy storage capacitor through a bleeder circuit, so that the energy storage capacitor is protected when the power consumption load is large and the power output by the current transformer is greater than the power consumed by the power consumption load, the voltage of the energy storage capacitor is prevented from rising without limitation, and finally the energy storage capacitor outputs stable 24V direct current voltage. The voltage conversion circuit comprises a first voltage conversion module, a third voltage conversion module and a fourth voltage conversion module, and is used for charging the lithium battery with 24V direct current voltage, reducing the 24V direct current voltage into 5V direct current voltage and boosting the 24V direct current voltage into 48V direct current voltage. Meanwhile, the lithium battery charging system further comprises a second voltage conversion module for converting the lithium battery into 24V direct current voltage. And the device also comprises a bleeder circuit, and the secondary current output by the current transformer is prevented from generating a peak current or an overload current larger than the steady-state current through the bleeder circuit.
The respective circuits in the device are explained in detail below.
Fig. 2 is a circuit diagram of the surge protection circuit, the rectification circuit and the bleeder circuit of the self-powered device of the embodiment.
The rectifying circuit is a rectifier bridge ZL1, the alternating current end of the rectifying circuit is connected with a current transformer CT to convert secondary current output by the current transformer into pulsating direct current, the direct current end of the rectifying circuit is connected with an energy storage capacitor C1 through an anti-reverse diode D3, the anode of the anti-reverse diode D3 is connected with the anode of the direct current end of the rectifier bridge ZL1, and therefore the direct current charges an energy storage capacitor C1 through the anti-reverse diode, the energy storage capacitor C1 cannot discharge through the rectifier bridge ZL1, and meanwhile a thermistor R4 in an anti-surge circuit introduced below is protected.
The surge prevention circuit comprises a thermistor R4, a TVS tube D6 and a piezoresistor R3 which are connected in series, wherein the TVS tube D6 and the piezoresistor R3 which are connected in series are connected with the alternating current end of a rectifier bridge ZL1 in parallel, and the thermistor R4 is connected with the direct current end of the rectifier bridge ZL1 in parallel. In the traditional surge-proof circuit, only a single piezoresistor R3 is connected in parallel at the alternating current end of the rectifier bridge ZL1, so that the piezoresistor R3 is in a conducting state for a long time, and the piezoresistor R3 is easily burnt out due to long-time heating. In the implementation, a transient voltage suppression diode (TVS tube) D6 connected in series with a piezoresistor R3 is added, the TVS tube D6 is high in conduction speed and large in capacity, but the long-time discharge capacity of the TVS tube D6 is lower than that of the piezoresistor, so that the TVS tube D and the piezoresistor are connected in series to achieve the effect of mutual compensation, the stability of the whole self-powered device is effectively improved, and the service life of the device is prolonged. In addition, the thermistor R4 is used as a backup protection of the rectifier circuit after the power-taking loop takes power, so that the device can be further prevented from being damaged by overcurrent.
The bleeder circuit comprises a first optical coupler OP1, a first switch tube Q1, a first voltage regulator tube D2, a second voltage regulator tube D4, a third voltage regulator tube D5, a first capacitor C3, a first resistor R2 and a second resistor R1. After the second resistor R1, the first voltage-regulator tube D2 and the primary side of the first optical coupler OP1 are sequentially connected in series, one end of the second resistor R1 is connected with the cathode of an anti-reverse diode D3, the other end of the second resistor R2 is connected with the input end of a first switch tube Q1, and the cathode of the first voltage-regulator tube D2 is connected with the cathode of an anti-reverse diode D3 through a first resistor R2. After the secondary side of the first optocoupler OP1, the second voltage-regulator tube D4 and the first resistor R2 are sequentially connected in series, one end of the second voltage-regulator tube is connected with the anode of the direct-current end of the rectifier bridge ZL1, and the anode of the second voltage-regulator tube is connected with the control end of the first switch tube Q1 through the first resistor R2. The output end of the first switching tube Q1 is connected with the negative electrode of the direct current end of the rectifier bridge ZL 1. Meanwhile, a third voltage regulator tube D5 and a first capacitor C3 are further arranged between the serial connection point of the second voltage regulator tube D4 and the first resistor R2 and the output end of the first switch tube Q1, and the third voltage regulator tube D5 and the first capacitor C3 are arranged in parallel. The first switch Q1 may be a MOSFET. The working principle is as follows: in the process that the current transformer CT charges the energy storage capacitor C1 through the rectifier bridge, the voltage at two ends of the energy storage capacitor C1 is continuously increased, when a preset voltage value is reached, the first voltage-stabilizing tube D2 connected with the second resistor R1 in series is conducted, then the first optical coupler OP1 is conducted, the further rectified current breaks through the second voltage-stabilizing tube D4 to conduct the first switch tube Q1, and the rectified current flows back through the first switch tube Q1 after the first switch tube Q1 is conducted, so that the purpose of discharging large current is achieved. The second regulator tube D4 and the first resistor R2 are connected in series to the control end of the first switch tube Q1 (i.e., the gate of the MOSFET tube), so as to further ensure the output accuracy and stability of the self-powered device, the first capacitor C3 controls the on-time of the first switch tube Q1, and the third regulator tube D5 provides overvoltage protection for the first switch tube Q1.
After passing through the circuits, the alternating current output by the current transformer can be converted into stable 24V direct current voltage.
Fig. 3 is a circuit diagram of the first voltage conversion module, the second voltage conversion module, and the third voltage conversion module of the self-powered device according to the embodiment, so that the 24V dc voltage is used for charging the lithium battery, the lithium battery is reversely boosted to 24V dc voltage, and the 24V dc voltage is reduced to 5V dc voltage.
The third voltage conversion module converts the 24V direct current voltage into 5V voltage required by the work of electronic components such as a CPU chip, a liquid crystal and the like. As shown in fig. 3, the third voltage conversion module includes a third voltage conversion chip DY1, which is a buck chip (a voltage conversion chip with model number WRF2405S may be adopted), and the 24V dc voltage is connected to the input terminal Vin of the third voltage conversion chip DY1 through the first diode D9, and the 5V dc voltage is output through the third voltage conversion module DY 1. Also, a second capacitor C8 and a third capacitor C13 are connected in parallel between the input terminal Vin of the third voltage conversion chip DY1 and the ground terminal GND to implement high frequency and low frequency filtering.
The first voltage conversion module comprises a first voltage conversion chip U2, the second voltage conversion module comprises a second voltage conversion chip U3, the first voltage conversion chip U2 is a voltage reduction chip (a voltage conversion chip with model number BQ21040 can be adopted), and the second voltage conversion chip U3 is a voltage boost chip (a voltage conversion chip with model number TPS55340 can be adopted). The 24V direct current voltage direct connection first voltage conversion chip U2's input VIN, the positive pole of lithium cell BAT is connected to output VOUT to charge for lithium cell BAT through first voltage conversion chip U2. Moreover, in order to realize the boosting of the lithium battery to 24V direct current voltage, the module further comprises a second optical coupler T11 and a key switch W1. One end of the primary side of the second optocoupler T11 is connected with VCC through a third resistor R25, and the other end of the primary side of the second optocoupler is connected with the control end of the CPU; one end of a secondary side of the second optocoupler T11 is connected with the anode of the lithium battery BAT, and the other end of the secondary side of the second optocoupler T11 is connected with an enabling end EN of the second voltage conversion chip U3; the anode of the lithium battery BAT is also connected with the input end VIN of the second voltage conversion chip U3; the key switch W1 is connected in parallel with the secondary side of the second optocoupler T11. The FREQ terminal of the second voltage conversion chip U3 is grounded through the fourth resistor R11, and the SS terminal is grounded through the fourth capacitor C10 to set the switching frequency of the second voltage conversion chip U3. The COMP terminal of the second voltage converting chip U3 is grounded through a fifth capacitor C11 and a fifth resistor R12 connected in series to compensate the voltage value output by the second voltage converting chip U3. The key switch W1 is a manual trigger key, after the button W1 is pressed, the enable end EN of the second voltage conversion chip U3 has a signal, the lithium battery BAT outputs 24V direct current voltage through the fifth resistor R8 and the sixth resistor R10 which are connected with the second voltage conversion chip U3, and after the second voltage conversion chip U3 starts to work, the second optical coupler T11 is controlled by the CPU to be switched on to continuously maintain the enable end EN of the second voltage conversion chip U3 to continuously have high-level input, so that the continuous operation of the second voltage conversion chip U3 is ensured.
Fig. 4 is a circuit diagram of a fourth voltage conversion module of the self-powered device according to the embodiment. The fourth voltage conversion module comprises a fourth voltage conversion chip U4, and the fourth voltage conversion chip U4 is a boost chip (a voltage conversion chip with a model number LM3421 may be used). The 24V direct-current voltage is connected with an input end VIN and an enable end EN of a fourth voltage conversion chip U4 through filter capacitors C15 and C14 to provide a working power supply and an enable input power supply for the fourth voltage conversion chip U4, so that the fourth voltage conversion chip U4 works at a switching frequency set by an eleventh resistor R15 connected in series with a sixth capacitor C20, the 24V direct-current voltage controls an energy storage inductor L3 to store energy through a second switching tube Q2, and the energy storage tripping capacitor C19 is further charged through a reverse fast large-current diode D8; the seventh resistor R14 is connected in series with the energy storage tripping capacitor C19 and is connected in parallel with the sampling feedback resistors R15 and R17, and the resistance values of the three resistors are adjusted to be set to be the magnitude of the charging current of the energy storage tripping capacitor C19; the seventh capacitor C18 is connected in parallel to the two ends of the energy storage tripping capacitor C19 and the seventh resistor R14 as a feedback signal source of the output voltage value of the circuit, and the eighth resistor R19 is further connected in series with the ninth resistor R24 as a sampling point to be connected to the output voltage value feedback input end of the fourth voltage conversion chip U4, so that the output value of the energy storage capacitor can be adjusted. In addition, the ninth capacitor C16 and the tenth resistor R21 are grounded in parallel and then connected to the compensation input end of the fourth voltage conversion chip U4, so that the charging current value of the set energy storage tripping capacitor is further stabilized, and the eighth capacitor C17 is grounded and then connected to the start time control end of the working power supply of the fourth voltage conversion chip U4, so that the start time setting of the boost module is realized.
It should be noted that the connection structure of the circuits in fig. 2, 3 and 4 only introduces important components, some of which belong to peripheral circuits of the voltage conversion chip, and are not specifically described in detail in this embodiment.
In a whole view, the device is additionally provided with an anti-surge circuit to prevent the whole self-powered device from being instantaneously burnt out when the current transformer outputs peak current or overload current. In addition, the device converts the secondary current output by the current transformer into working voltage required by various loads, effectively reduces power supply equipment (such as a PT cabinet, a UPS, a direct current screen and the like), makes the power getting technology of the current transformer more stable and reliable by utilizing a power technology, and improves the application range of the device. Meanwhile, when the current of the current transformer is large, the high voltage generated by the current transformer is effectively prevented by using the bleeder circuit, and the safety of the field and equipment is further ensured. The device has low cost, stable working performance and convenient use, and can provide a stable and economic power supply scheme for users.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (7)
1. A self-powered device is characterized by comprising a current transformer, a rectifying circuit and an energy storage circuit which are connected in sequence; the anti-surge circuit comprises a thermistor, a transient voltage suppression diode and a piezoresistor which are connected in series, wherein the transient voltage suppression diode and the piezoresistor which are connected in series are connected with the alternating current end of the rectifying circuit in parallel, and the thermistor is connected with the direct current end of the rectifying circuit in parallel.
2. The self-powered device according to claim 1, wherein a bleeder circuit is further arranged between the rectifying circuit and the energy storage circuit, the bleeder circuit comprises a first optocoupler, a first switch tube and a first voltage regulator tube, the first voltage regulator tube and a primary side of the first optocoupler are connected in series and then connected in parallel with a direct current end of the rectifying circuit, and a cathode of the first voltage regulator tube is connected with an anode of the direct current end of the rectifying circuit; one end of the first optical coupler secondary side is connected with the positive electrode of the direct current end of the rectifying circuit, and the other end of the first optical coupler secondary side is connected with the control end of the first switching tube; the input end of the first switching tube is connected with the positive pole of the direct current end of the rectifying circuit, and the output end of the first switching tube is connected with the negative pole of the direct current end of the rectifying circuit.
3. The self-powered device according to claim 1, wherein a reverse diode is connected in series between the rectifying circuit and the energy storage circuit, and an anode of the reverse diode is connected to an anode of a direct current end of the rectifying circuit.
4. The self-powered device according to claim 2, wherein a second voltage regulator tube and a first resistor are connected in series between the other end of the secondary side of the first optocoupler and the control end of the first switch tube, and an anode of the second voltage regulator tube is used for connecting the control end of the first switch tube.
5. A self-powered device according to claim 4, wherein a first capacitor and a third voltage regulator tube are connected between the serial connection point of the second voltage regulator tube and the first resistor and the negative pole of the direct current end of the rectifying circuit, the first capacitor and the third voltage regulator tube are arranged in parallel, and the anode of the third voltage regulator tube is connected with the negative pole of the direct current end of the rectifying circuit.
6. The self-powered device of claim 1, further comprising a voltage conversion circuit, wherein an input of the voltage conversion circuit is connected to an output of the tank circuit, and the voltage conversion circuit comprises at least one voltage conversion module for converting the voltage output by the tank circuit into a different voltage to power a corresponding load.
7. The self-powered device according to claim 6, further comprising a voltage conversion circuit including a first voltage conversion module and a second voltage conversion module, wherein the first voltage conversion module includes a first voltage conversion chip, an input terminal of the first voltage conversion chip is connected to an output terminal of the energy storage circuit, and an output terminal of the first voltage conversion chip is used for connecting the lithium battery; the second voltage conversion module comprises a second voltage conversion chip, a controller, a second optocoupler and a key switch, wherein the input end of the second voltage conversion chip is used for connecting a lithium battery, the primary side of the second optocoupler is connected with the controller, one end of the secondary side of the second optocoupler is connected with the input end of the second voltage conversion chip, the other end of the secondary side of the second optocoupler is connected with the enabling end of the second voltage conversion chip, one end of the key switch is connected with the input end of the second voltage conversion chip, and the other end of the key switch is connected with the enabling end of the second voltage conversion chip.
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| CN201911031982.XA CN110729771B (en) | 2019-10-28 | 2019-10-28 | Self-powered device |
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| CN110212622A (en) * | 2019-04-29 | 2019-09-06 | 苏州捷杰传感技术有限公司 | Vibrating screen monitoring combined sensor with self-powered function |
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| CN201813599U (en) * | 2010-10-19 | 2011-04-27 | 王子能 | LED (Light-Emitting Diode) dimmer power |
| CN202268694U (en) * | 2011-10-24 | 2012-06-06 | 波达通信设备（广州）有限公司 | Lightning surge protection circuit applied to digital microwave transceiver |
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| CN110729771B (en) | 2020-12-15 |
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