JP2021029106A - Power supply unit for electric fence - Google Patents

Abstract

To provide a power supply unit for an electric fence capable of reducing a risk of a person who falls down on a bare wire while securing a repellent effect for a wild animal.SOLUTION: In a power supply unit for an electric fence, the electric fence includes a bare wire 4, and a pillar for supporting the bare wire 4, and is installed around a crop land. The power supply unit includes an electric source 16, a booster circuit 17 for boosting the voltage output from the electric source 16, a capacitor 18 for charging and discharging the voltage boosted by the booster circuit 17, a switch 19 for switching charging and discharging of the capacitor 18, switch control means 20 for controlling the switch 19 and causing the capacitor 18 to discharge intermittently, a transformer 21 electrically connected to the bare wire 4 for further boosting the voltage discharged by the capacitor 18, and outputting the boosted voltage to the bare wire 4, output voltage detection means 24 for detecting a voltage value output by the transformer 21, and voltage boosting level control means 25 for controlling a voltage boosting level of the booster circuit 17 according to the detected voltage value.SELECTED DRAWING: Figure 3

Description

The present invention relates to a power supply device for an electric fence installed around an agricultural land, a ranch, or the like.

Since ancient times, the damage caused by wild animals ruining agricultural land has been a problem. An electric fence has been used as one of the countermeasures for this problem (see, for example, Patent Document 1). This type of electric fence includes bare wires, stanchions, and power supplies. The stanchions are erected around the farmland at regular intervals, and the bare wires are fixed to the stanchions so as to surround the farmland. The power supply is fixed to the installation pillar and electrically connected to the bare wire. Then, the power supply device causes a high-voltage current to flow through the bare electric wire for a short time at predetermined intervals. As a result, wild animals get an electric shock when they come into contact with the bare electric wire, and the shock of the electric shock makes them afraid of the bare electric wire and keeps them away from the farmland. Electric fences may be installed on the slopes of mountains and hills as well as on flat ground. In addition, such an electric fence is also installed in the ranch and is used to prevent livestock in the ranch from leaving the ranch.

By the way, regarding the safety of electric fences, the installation method is stipulated by the Electrical Appliance and Material Safety Law, and as long as the stipulations are followed, even if a person comes into contact with a bare electric wire, it does not affect human life. For example, when a person comes into contact with a bare wire, he / she receives an electric shock due to a high voltage, but since no current is continuously flowing through the bare wire, he / she can be separated from the bare wire. However, if the place where the electric fence was installed is on a mountain slope, or if the place where the electric fence is installed is muddy due to rain, a person may fall into a bare electric wire, and in this case, stand up immediately. Because it was not easy, there was a risk of receiving electric shocks many times. There was also the secondary danger that a person would rush to get up from the pain caused by an electric shock and then fall and get seriously injured. As a countermeasure against such danger, it is conceivable to widen the interval at which the high-voltage current flows through the bare wire or lower the voltage value or current value of the high-voltage current, but in this case, the repellent effect on wild animals is reduced. There was a problem that it would end up.

JP 2012-85512

Therefore, an object of the present invention is to provide a power supply device for an electric fence that can reduce the risk of a person falling into a bare electric wire while ensuring a repellent effect on wild animals.

In order to solve the above problems, the electric fence power supply device according to the present invention is used.
An electric fence is installed around the farmland or ranch, with bare wires and stanchions to secure the bare wires.
The power supply is
Power supply and
A booster circuit that boosts the voltage output from the power supply and
A capacitor that charges and discharges the voltage boosted by the booster circuit,
A switch that switches the charge and discharge of the capacitor,
A switch control means that controls the switch and intermittently discharges the capacitor,
A transformer that is electrically connected to a bare wire, further boosts the voltage discharged by the capacitor, and outputs it to the bare wire.
Output voltage detecting means for detecting the voltage value output by the transformer,
It is characterized by including a boost level control means for controlling the boost level of the boost circuit according to the voltage value detected by the output voltage detection means.

The above power supply device
Preferably,
The boost level control means lowers the boost level when the voltage value detected by the output voltage detection means is lower than a predetermined threshold value, and lowers when the voltage value detected after lowering the boost level is equal to or higher than the predetermined threshold value. The boost level that was used is restored to the original boost level.

The above power supply device
In particular,
The output voltage detection means
A voltage divider circuit that divides the voltage output by the transformer,
A rectifier circuit that detects and rectifies the voltage divided by the voltage divider circuit,
The peak value of the voltage detected and rectified by the rectifier circuit is held, the voltage of the held peak value is output to the boost level control means, and the peak value held at the timing when the switch control means switches on is It has a peak hold circuit that is reset.

The above power supply device
Preferably,
Further equipped with a choke coil connected in series with the ground side of the primary winding of the transformer,
The choke coil has a wider pulse width of the voltage output by the transformer than when the choke coil is not connected.

The electric fence power supply device according to the present invention can reduce the risk of a person falling into a bare electric wire while ensuring a repellent effect on wild animals.

It is a schematic diagram of the electric fence provided with the electric fence power supply device which concerns on this invention. It is an enlarged view of the electric fence power supply device of FIG. It is a functional block diagram of the electric fence power supply device of FIG. It is a functional block diagram of the booster circuit and the booster circuit stop means of FIG. It is a circuit diagram which shows the connection position of a choke coil. (A) is a graph showing the waveform of the output voltage when the choke coil is not connected, and (b) is a graph showing the waveform of the output voltage when the choke coil is connected. It is a functional block diagram of the output voltage detecting means and the step-up level control means of FIG. It is a circuit diagram which shows the operation of the vibration sensor (buzzer) which concerns on this invention.

Hereinafter, an embodiment of the electric fence power supply device according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a diagram showing an outline of an electric fence provided with the electric fence power supply device 1 (hereinafter referred to as “power supply device 1”) of the present invention. The electric fence includes a support column 3 and a bare electric wire 4. The columns 3 are erected at intervals around the agricultural land. The bare electric wire 4 is fixed to the support column 3 via an insulator (not shown) so as to surround the agricultural land. The power supply device 1 is installed on an installation pillar 5 erected near an electric fence via a bracket (not shown). The power supply device 1 has a plurality of operation modes (four in this embodiment), and is configured to intermittently output a voltage to the bare electric wire 4 according to each operation mode.

The power supply device 1 includes a control means storage container 10 and a power supply storage container 11, and includes an output terminal 12 and a ground terminal 13 on the outer surface of the control means storage container 10.

The output terminal 12 is connected to the bare electric wire 4 via the output line 6. The ground terminal 13 is grounded via a ground wire 7 and a ground rod 8 connected to one end of the ground wire 7.

With reference to FIG. 2, the power supply device 1 further includes an optical sensor 14 and an input means 15 on the outer surface of the control means storage container 10.

The optical sensor 14 determines whether the current state is daytime or nighttime according to the amount of received light, and outputs the determination result to the logic control circuit 170 (FIG. 4) described later.

The input means 15 is used to operate the power supply device 1. The input means 15 includes a stop button 150, a continuous operation button 151, a day operation button 152, and a night operation button 153. When any one of the buttons 150, 151, 152, and 153 of the input means 15 is pressed, the operation mode corresponding to the pressed button is input to the logic control circuit 170 (FIG. 4).

The control means storage container 10 has an output lamp 100, an operation display LED 101, and a power input terminal 102.

The output lamp 100 lights up every time the power supply device 1 outputs a voltage to the bare wire 4. Many wild animals have two-color color vision and cannot recognize the same color as a person with three-color color vision. Therefore, the color of the output lamp 100 is set to blue that the wild animal can recognize, not red or the like that the wild animal cannot recognize.

As a result, when a wild animal touches the bare electric wire 4 and receives an electric shock, it not only warns against the bare electric wire 4, but also warns against the blue light blinking beside it when the electric shock occurs. ..

The operation display LED 101 is arranged above each button of the input means 15, and among the operation display LEDs 101, the LED corresponding to the current operation mode is lit.

The power input terminal 102 is a connection terminal for connecting the external power supply and the power supply device 1 when an external power source such as an automobile battery is used as the power supply 16 of the power supply device 1.

With reference to FIG. 3, the power supply device 1 includes a power supply 16, a booster circuit 17, a capacitor 18, a switch 19, a switch control means 20, a transformer 21, a vibration sensor 22, and a booster circuit stop means 23. The output voltage detecting means 24 and the boosting level controlling means 25 are further provided.

The power supply 16 is stored in the power supply storage container 11. The power source 16 is a battery in this embodiment, and outputs a DC voltage of 12 V.

The booster circuit 17 boosts the voltage output from the power supply 16 (hereinafter, referred to as “power supply voltage”) to a predetermined value. In this embodiment, the booster circuit 17 boosts the power supply voltage to about 400 V.

The capacitor 18 charges and discharges the voltage boosted by the booster circuit 17.

The switch 19 switches the charge / discharge of the capacitor 18. Specifically, the capacitor 18 is charged while the switch 19 is off, and the capacitor 18 is discharged when the switch 19 is switched on.

The switch control means 20 intermittently discharges the capacitor 18 by controlling the switch 19. Specifically, the switch control means 20 discharges the capacitor 18 at predetermined timings by switching the switch 19 from off to on at predetermined timings. The predetermined timing is 1.2 seconds in this embodiment.

The secondary side of the transformer 21 is electrically connected to the bare electric wire 4 via the output terminal 12. The transformer 21 further boosts the voltage discharged by the capacitor 18, and outputs the boosted voltage to the bare wire 4. In this embodiment, the transformer 21 boosts the voltage to about 5,000 V at a load of 5 kΩ. Since the timing of outputting the voltage of the transformer 21 and the timing of discharging the capacitor 18 are linked with each other, the transformer 21 outputs the voltage to the bare wire 4 approximately every 1.2 seconds.

As a result, wild animals get an electric shock when they touch the bare electric wire 4, and they are afraid of the bare electric wire 4 from the shock caused by the electric shock and do not approach the agricultural land. Further, as described above, when a wild animal touches the bare electric wire 4 and receives an electric shock, the light of the output lamp 100 blinking near the bare electric wire 4 when the electric shock occurs is also warned. As a result, the power supply device 1 can enhance the repellent effect on wild animals by the synergistic effect of the electric shock given by the bare electric wire 4 and the light stimulation by the blinking of the output lamp 100.

With reference to FIG. 4, the booster circuit 17 includes a logic control circuit 170, an oscillation circuit 171 and a voltage doubler rectifier circuit 172.

The logic control circuit 170 controls the oscillation circuit 171 according to the operation mode input by the input means 15. For example, when the daytime operation button 152 is pressed, the logic control circuit 170 drives the oscillation circuit 171 while the optical sensor 14 determines that it is daytime, and while the optical sensor 14 determines that it is nighttime, the logic control circuit 170 drives the oscillation circuit 171. The oscillation circuit 171 is stopped. Further, the logic control circuit 170 stops driving the oscillation circuit 171 when the stop button 150 is pressed.

The oscillation circuit 171 generates an AC voltage of about 200 V from the power supply voltage.

The voltage doubler rectifier circuit 172 generates a DC voltage of about 400 V from the AC voltage generated by the oscillation circuit 171.

With reference to FIG. 5, in this embodiment, the switch 19 is composed of a thyristor 190, and the switch control means 20 is composed of a pulse generation circuit 200.

The pulse generation circuit 200 generates a pulse voltage every 1.2 seconds, outputs the generated pulse voltage to the gate of the thyristor 190, and turns on the thyristor 190.

When the thyristor 190 is turned on, the anode and cathode of the thyristor 190 become conductive. The capacitor 18 discharges every time the anode and cathode of the thyristor 190 conduct with each other (that is, every 1.2 seconds).

The power supply device 1 further includes a choke coil 27 in this embodiment. The choke coil 27 is connected in series with the ground side of the primary winding of the transformer 21.

6 (a) and 6 (b) are graphs showing waveforms of the output voltage when the output voltage of the transformer 21 is set to 4,000 V. FIG. 6A shows the waveform of the output voltage when the choke coil 27 is not connected, and FIG. 6B shows the waveform of the output voltage when the choke coil 27 of 1 mH is connected. As shown by the pulse widths W1 and W2 in the respective graphs, by connecting the choke coil 27, the pulse width of 2,000 V, which is the half peak value of the output voltage, is expanded from 43 μs to 60 μs. Specifically, when the choke coil 27 is connected, the voltage discharged from the capacitor 18 is applied to the primary winding of the transformer 21, and the pulsed voltage is dielectriced to the secondary winding of the transformer 21. When the flyback voltage generated by the choke coil 27 is further applied to the primary winding, the current consumption of the power supply device 1 is not increased, and the pulse is higher than when the choke coil 27 is not connected. The widened pulsed voltage is dielectriced in the secondary winding.

As a result, the power supply device 1 can output a voltage having a wider pulse width to the bare wire 4, and as a result, the choke coil 27 is not connected to the wild animal in contact with the bare wire 4. It can give a bigger electric shock than it does.

In a conventional power supply device, in order to widen the pulse width of the output voltage, for example, the boost level of the booster circuit 17 is increased, the capacity of the capacitor 18 is increased, the secondary winding of the transformer 21 is thickened, and the number of windings thereof is increased. Needed to be increased. In this case, the conventional power supply device has a problem that not only the manufacturing cost increases but also the current consumption increases and the voltage conversion efficiency deteriorates. According to the power supply device 1 of the present embodiment, by connecting the choke coil 27, it is possible to improve the voltage conversion efficiency and widen the pulse width of the output voltage while suppressing the manufacturing cost.

Next, the safety measures of the power supply device 1 when a person comes into contact with the bare electric wire 4 will be described.

With reference to FIG. 3 again, the output voltage detecting means 24 detects the output voltage output by the transformer 21.

The boost level control means 25 controls the boost level of the boost circuit 17 based on the value of the output voltage detected by the output voltage detection means 24. The voltage value detected by the output voltage detecting means 24 decreases when a person comes into contact with the bare wire 4 and receives an electric shock. That is, when the detected voltage value is lower than a predetermined threshold value, the boosting level control means 25 determines that a person has an electric shock, and controls the boosting circuit 17 to lower the boosting level. At this time, it is preferable that the boosting level control means 25 lowers the boosting level until, for example, the output voltage reaches a level at which a person who comes into contact with the bare wire 4 and receives an electric shock does not feel pain.

As a result, when a person comes into contact with the bare wire 4 and receives an electric shock, the power supply device 1 does not continuously output the normal output voltage to the bare wire 4. Therefore, the power supply device 1 can prevent a person who has fallen into the bare electric wire 4 from continuously applying a normal output voltage until the person falls away from the bare electric wire 4. Further, the power supply device 1 can prevent a person who has fallen into the bare electric wire 4 from rushing to fall away from the bare electric wire 4 by lowering the boost level to the extent that he / she does not feel pain. ..

Further, when the voltage value detected after lowering the boosting level is equal to or higher than a predetermined threshold value, the boosting level control means 25 restores the lowered boosting level to the original boosting level.

As a result, the power supply device 1 can exert a repellent effect on wild animals as before when a person who comes into contact with the bare electric wire 4 separates from the bare electric wire 4.

With reference to FIG. 7, the output voltage detecting means 24 includes a voltage dividing circuit 240, a rectifier circuit 241 and a peak hold circuit 242.

The voltage dividing circuit 240 divides the voltage output by the transformer 21.

The rectifier circuit 241 detects and rectifies the voltage divided by the voltage dividing circuit 240.

The peak hold circuit 242 holds the peak value of the voltage detected and rectified by the rectifier circuit 241 and outputs the held peak value voltage (hereinafter, referred to as “peak voltage Vp”) to the step-up level control means 25. The peak voltage Vp is reset at the timing when the switch control means 20 switches the switch 19 on (every 1.2 seconds in this embodiment). That is, by outputting the pulse voltage to the peak hold circuit 242 at the same timing as the pulse generating circuit 200 outputs the pulse voltage to the base of the thyristor 190, the peak voltage is output at the same timing as the timing when the thyristor 190 is turned on. Vp is reset.

The boost level control means 25 includes a comparator 250 and a boost level lowering circuit 251.

The comparator 250 compares the peak voltage Vp output by the peak hold circuit 242 with the predetermined reference voltage Vref, and determines whether or not the peak voltage Vp is lower than the reference voltage Vref. The reference voltage Vref is set to a voltage value (Vref> Vp) higher than the peak voltage Vp when a person comes into contact with the bare wire 4.

When the comparator 250 determines that the peak voltage Vp is lower than the reference voltage Vref (that is, Vref> Vp), the boost level lowering circuit 251 controls the oscillation circuit 171 to lower the boost level.

Further, when the comparator 250 determines that the peak voltage Vp is equal to or higher than the reference voltage Vref (that is, Vref ≦ Vp), the boost level lowering circuit 251 sets the boost level to the original level when the boost level is lowered. Return to. In this embodiment, the boost level lowering circuit 251 resets the peak voltage Vp every 1.2 seconds, so that the boost level is lowered, restored, or maintained every 1.2 seconds.

Next, safety measures for the power supply device 1 when the power supply device 1 is dropped due to an earthquake or the like will be described.

With reference to FIG. 3 again, the vibration sensor 22 detects the vibration of the power supply device 1. Vibrations include, for example, sudden shaking due to an earthquake, gusts due to a typhoon, ramming of animals, and impacts from flash floods.

The booster circuit stopping means 23 stops driving the booster circuit 17 when a vibration value equal to or higher than a predetermined threshold value is detected by the vibration sensor 22.

As a result, when the power supply device 1 is vibrated by an impact such as an earthquake, the output of the voltage to the bare electric wire 4 is stopped, so that the power supply device 1 is dropped from the installation pillar 5 by the impact and is immersed in a puddle or the like. To prevent a person from coming into contact with the power supply device 1, the bare electric wire 4, the puddle, etc. and receiving an electric shock when the bare electric wire 4 is removed from the support column 3 due to a drop of the power supply device 1 or the like and is immersed in a puddle or the like. Can be done.

With reference to FIG. 4, the booster circuit stop means 23 includes an amplifier 230, a latch circuit 231 and a stop circuit 232.

The vibration sensor 22 is a piezoelectric element 220 in this embodiment. When the piezoelectric element 220 is subjected to vibration, the piezoelectric element 220 converts the vibration into a voltage by the piezoelectric effect and outputs the vibration to the amplifier 230.

The amplifier 230 amplifies the voltage output by the piezoelectric element 220. The latch circuit 231 outputs an electric signal for stopping the driving of the booster circuit 17 to the stop circuit 232 when the voltage value amplified by the amplifier 230 is equal to or higher than a predetermined threshold value. The stop circuit 232 stops driving the oscillation circuit 171 when an electric signal is output from the latch circuit 231. As a result, the output of the voltage from the power supply device 1 to the bare wire 4 is stopped. The latch circuit 231 continuously outputs an electric signal to the stop circuit 232 even after the drive of the oscillation circuit 171 is stopped, and causes the stop circuit 232 to continue to stop the drive of the oscillation circuit 171.

The drive of the booster circuit 17 is stopped by the booster circuit stopping means 23, and then restarted when a predetermined input for releasing the stop is made. Specifically, the latch circuit 231 stops the output of the electric signal to the stop circuit 232 when a predetermined input for releasing the stop of the drive of the booster circuit 17 is made, and drives the oscillation circuit 171 to the stop circuit 232. To release the suspension of. As a result, the driving of the booster circuit 17 is restarted.

Therefore, since the power supply device 1 does not restart the output of the voltage to the bare wire 4 unless a predetermined input is made, a person usually performs after the drive of the booster circuit 17 is stopped by the booster circuit stopping means 23. It is possible to prevent an electric shock by restarting the power supply device 1 by the operation.

In this embodiment, the predetermined input for releasing the stop of the drive of the oscillation circuit 171 is made by pressing the stop button 150.

Next, a specific configuration of the vibration sensor 22 will be described. The vibration sensor 22 is a piezoelectric element 220 in this embodiment. The piezoelectric element 220 has conventionally been used as a buzzer that emits a sound when the input means 15 is pressed in the electric fence power supply device, and the power supply device 1 can use the piezoelectric element 220 as a buzzer. The piezoelectric element 220 can be used as the vibration sensor 22 while leaving the configuration.

As a result, the power supply device 1 does not need to be separately provided with the vibration sensor 22 because it has a function of preventing a person from getting an electric shock due to the power supply device 1 falling due to an earthquake or the like. Therefore, the power supply device 1 can have a function of preventing the electric shock while suppressing the cost.

With reference to FIG. 8, the power supply device 1 further includes transistors 26a and 26b. When any one of the buttons 150, 151, 152, and 153 of the input means 15 is pressed, the transistor 26a is turned on by applying the voltage from the input voltage Vin to the base. As a result, the piezoelectric element 220 is applied with a voltage from the power supply voltage Vcc to emit a buzzer sound. At this time, the transistor 26b is also turned on by applying the voltage from the input voltage Vin to the base. As a result, the voltage from the power supply voltage Vcc is not applied to the amplifier 230.

On the other hand, when the piezoelectric element 220 is given a vibration, the piezoelectric element 220 converts the vibration into a voltage by the piezoelectric effect. At this time, since the transistors 26a and 26b are off, the voltage converted by the piezoelectric element 220 is applied to the amplifier 230. The amplifier 230 amplifies this voltage and outputs it to the latch circuit 231.

According to the circuit shown in FIG. 8, the power supply device 1 can use the piezoelectric element 220 as the buzzer 22 and the vibration sensor 22.

From the above, the power supply device 1 can output a high voltage to the bare wire 4 every 1.2 seconds. As a result, wild animals get an electric shock when they touch the bare electric wire 4, and they are afraid of the bare electric wire 4 from the shock caused by the electric shock and do not approach the agricultural land.

When the peak voltage Vp drops below the reference voltage Vref, the boost level control means 25 controls the boost circuit 17 to lower the boost level. As a result, the power supply device 1 can prevent a high voltage from being continuously applied to the person when the person falls down on the bare wire 4. Further, if the peak voltage Vp is equal to or higher than the reference voltage Vref, the boost level control means 25 restores the boost level to the original level. As a result, the power supply device 1 can exert a repellent effect on wild animals as before when a person who has fallen on the bare electric wire 4 separates from the bare electric wire 4.

In the power supply device 1, the choke coil 27 is connected in series to the ground side of the primary winding of the transformer 21 so that the current consumption is not increased and the transformer 21 is more than when the choke coil 27 is not connected. The pulse width of the voltage output by is widened. As a result, the power supply device 1 can give a larger electric shock to the wild animal while suppressing the manufacturing cost.

Although the preferred embodiment of the power supply device 1 according to the present invention has been described above, the present invention is not limited to the above embodiment.

[Modification example]
The electric fence may be installed not only on the agricultural land but also on the ranch, for example. Further, the power supply device 1 may be installed not only on the installation pillar 5 but also on a mounting table such as a block and a stone.

When the boost level control means 25 controls the boost circuit 17 to lower the boost level, the step-up level may be lowered by, for example, 1/10 or 1/100 of the output voltage. Not limited.

The predetermined timing at which the switch control means 20 switches the switch 19 on is not particularly limited as long as it is an effective timing for repelling wild animals.

The predetermined input for releasing the stop of the drive of the booster circuit 17 is, for example, pressing any one of the buttons 150, 151, 152, and 153 of the input means 15 at the same time, or pressing and holding the buttons for a predetermined time. It is also good and is not particularly limited.

The power source 16 may be a solar battery (for example, a lead battery), and is not particularly limited. In this case, the solar battery may be stored in the power storage container 11 and charged by being connected to the solar panel via the power input terminal 102.

The switch 19 is not particularly limited as long as the charging / discharging of the capacitor 18 can be switched by turning it on / off.

The piezoelectric element 220 may be, for example, piezoelectric ceramics, and is not particularly limited.

The voltage dividing circuit 240 and the rectifying circuit 241 may be insulated by a photocoupler. As a result, when there is a lightning strike on the bare electric wire 4, it is possible to prevent the current due to the lightning strike from flowing to the power supply device 1.

1 Power supply device 3 Pillar 4 Bare wire 5 Installation pillar 6 Output line 7 Ground wire 8 Ground rod 10 Control means Storage container 100 Output lamp 101 Operation display LED
102 Power input terminal 11 Power storage container 12 Output terminal 13 Earth terminal 14 Optical sensor 15 Input means 150 Stop button 151 Continuous operation button 152 Day operation button 153 Night operation button 16 Power supply 17 Boost circuit 170 Logic control circuit 171 Oscillation circuit 172 Double voltage Rectifier circuit 18 Capacitor 19 Switch 190 Thyristor 20 Switch control means 200 Pulse generation circuit 21 Transformer 22 Vibration sensor (buzzer)
23 Booster circuit stop means 230 Amplifier 231 Latch circuit 232 Stop circuit 24 Output voltage detection means 240 Voltage division circuit 241 Rectifier circuit 242 Peak hold circuit 25 Boost level control means 250 Comparator 251 Boost level lowering circuit 26a, 26b Transistor 27 Chalk coil W1, W2 pulse width

Claims (4)

It is a power supply device for electric fences.
The electric fence includes a bare electric wire and a support column for fixing the bare electric wire, and is installed around a farmland or a ranch.
The power supply device
Power supply and
A booster circuit that boosts the voltage output from the power supply and
A capacitor that charges and discharges the voltage boosted by the booster circuit,
A switch for switching the charge / discharge of the capacitor and
A switch control means that controls the switch and intermittently discharges the capacitor.
A transformer that is electrically connected to the bare wire, further boosts the voltage discharged by the capacitor, and outputs it to the bare wire.
An output voltage detecting means for detecting the voltage value output by the transformer, and
A power supply device including a booster level control means for controlling a booster level of the booster circuit according to a voltage value detected by the output voltage detection means. When the voltage value detected by the output voltage detecting means is lower than a predetermined threshold value, the boosting level control means lowers the boosting level, and the voltage value detected after lowering the boosting level is equal to or higher than the predetermined threshold value. The power supply device according to claim 1, wherein the boosted level that has been lowered is returned to the original boosted level. The output voltage detecting means is
A voltage divider circuit that divides the voltage output by the transformer,
A rectifier circuit that detects and rectifies the voltage divided by the voltage divider circuit,
The peak value of the voltage detected and rectified by the rectifier circuit is held, the held peak value voltage is output to the boost level control means, and the switch control means holds the voltage at the timing when the switch is turned on. The power supply device according to claim 1 or 2, further comprising a peak hold circuit in which a peak value is reset. A choke coil connected in series with the ground side of the primary winding of the transformer is further provided.
The power supply device according to any one of claims 1 to 3, wherein the choke coil widens the pulse width of the voltage output by the transformer as compared with the case where the choke coil is not connected.

Images