JPH03143275A - Dc pulse generator - Google Patents

Abstract

PURPOSE:To increase an output of a DC pulse by connecting a choke coil and a rectifier in series between a DC power source circuit and a DC pulse generator in response to the forward direction of a DC current. CONSTITUTION:A current is made to flow through a choke coil 3 connected to the high voltage side of a DC power source, and then supplied to a DC pulse generator through a rectifier 4. A DC pulsating current is made to flow to the coil 3 upon switching in a DC pulse generator, and an AC voltage is excited across the coil 3. The DC voltage passed through the rectifier 4 connected to the coil 3 is added to the DC voltage of a DC power source to be charged in a discharging capacitor 5, and supplied to the high voltage side of the pulse generator. Since the pulse generator becomes a high voltage, it generates a DC pulse of large output responsive to the high voltage.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a direct current converter suitable for powering DC-DC conversion, DC-AC conversion, flashing lighting devices, magnetic therapy devices using DC pulsed magnetic fields, etc. pulse generator.

In particular, the present invention relates to a DC pulse generator that has been improved to suppress heat loss and increase discharge voltage.

[Prior Art] It has been known to use a DC pulse generator for such applications (Japanese Unexamined Patent Publication No. 57-22770, No. 1.2).
(see figure). In this device, it is unavoidable that heat is generated in the pure resistance R of the charging resistor during operation, so if you try to create a device with a large output, not only will the current increase and power loss due to heat generation will increase. Since heat dissipation must be taken into account, it has not been possible to easily downsize the device.

[Problems to be Solved by the Invention] Therefore, the present invention provides a device that is suitable for supplying DC pulses of a constant amount of electricity to a load with relatively low impedance, has low heat loss due to heat generation, and has a large output. Another object of the present invention is to provide a DC pulse generator that can be miniaturized.

[Means for Solving the Problem] After examining the prior art shown in Figure 1.2, we focused on the fact that a DC pulse current flows through the charging resistor H in response to the opening and closing of the switching element.

It was discovered that when a choke coil is connected in place of the charging resistor or H, a strong AC voltage is induced across the choke coil due to switching.If this AC voltage is rectified using a rectifier, the choke coil and We thought that the electrical energy that would be lost as heat through the internal resistance of the resonant circuit made up of capacitors could be used as a DC power source. In fact, when used in series with the voltage supplied from a DC power supply circuit and in such a way that the voltage increases,
The heat generated by the device due to heat loss was significantly reduced, and the voltage supplied to the discharge capacitor was increased, making it possible to increase the output of DC pulses due to its discharge.

The present invention will be explained in detail based on the drawings.

First of all, since the feature of the present invention is the addition of a choke coil and a rectifier, it goes without saying that known circuits can be used for the other circuits.

The conceptual diagram of the device of the present invention is as shown in FIG. 3, in which a DC pulse generating circuit is connected in series through five choke coils and a rectifier connected in series to a DC power supply circuit.

Each circuit and element will be individually explained based on FIG.

The power supply circuit is exemplified by a power supply smoothing capacitor 2 connected in parallel to a rectifying element 1. As long as stable direct current can be obtained, it can be used with batteries, double-wave rectifier circuits, or voltage doubler rectifier circuits.

The choke coil 3 may be a low-frequency choke coil with an iron core, an air-core choke coil, or a transformer with a secondary winding.

The rectifier 4 used is for smoothing the power supply.

Cylisk was illustrated as the switching element IO. It is also possible to replace it with a transistor as long as it has the same function.

The discharge capacitor 5 is selected in consideration of the desired output, frequency, voltage, pulse waveform, transformer capacity, etc.
．． A value of about 5 to 50 μF is commonly used.

Furthermore, the capacitance of the capacitor can be changed using a changeover switch.

The oscillation frequency control circuit is illustrated as being composed of a variable resistor 7, a relaxation oscillation capacitor 9, and a trigger diode 8. The oscillation frequency is determined by the time constant and voltage of the variable resistor 7 and the relaxation oscillation capacitor 9.
Adjusted by

Depending on the purpose of use, the load 6 can be connected with resistors, coils, etc. in series as shown in FIG. 4 or in parallel (not shown).

An example of the DC pulse generator of the present invention will be explained using FIG. 4. The DC pulse generator of the present invention includes a choke coil 3 and a rectifier 4 between the DC power supply circuit and the DC pulse generation circuit. Connected according to the forward direction of direct current.

Another example of the DC pulse generator of the present invention is described in Section 5.6.7.
It is shown in Figure 8.

The one in FIG. 8 is an example in which a tap is provided with the intention of increasing the charging voltage of the discharging capacitor 5.

It is also within the scope of the invention to apply the choke coil and rectifier elsewhere in the circuit for the same purpose.

[Effect] The operation will be explained based on FIG.

The current passes through a choke coil 3 connected to the high voltage side of the DC power supply circuit, then passes through a rectifier 4, and is supplied to the high voltage side of the DC pulse generation circuit.

As the DC pulse generation circuit switches, a pulsating DC current passes through the choke coil 3, and an AC voltage is excited across the choke coil 3. The DC voltage that has passed through the rectifier 4 connected to the choke coil 3 is added to the DC voltage of the DC power supply circuit, charges the discharge capacitor 5, and is supplied to the high voltage side of the DC pulse generation circuit. Since the DC pulse generation circuit has a high voltage, it generates DC pulses with a correspondingly large output.

In a steady state, the DC supplied to the DC pulse generation circuit has no elements that cause voltage fluctuations, and stable DC pulses are continuously generated.

It will be readily appreciated that the alternative circuits shown in FIGS. 5-8 have the same effect.

[Example] Example 1 In the circuit shown in Fig. 4, a 3H one is used for the choke coil 3.
A 3.3 μF discharge capacitor 5 is used, a silicon rectifier is used as the rectifier 4, a 20Ω resistor is used as the load 7, and the power supply circuit is connected to a 100μ commercial power source (measured value 101 V).
AC). The oscillation frequency was varied from 1 to 100 Hz. There is a potential difference of 140V in the DC power supply circuit and 590μ between both ends of the discharge capacitor, and each potential difference does not change as the oscillation frequency is adjusted, and stable and strong oscillation continues. Almost no heat was felt throughout the pulse generation circuit.

Example 2 The test was carried out under the same conditions as in Example 1 except that an air-core coil having a diameter of 15 cm and 50 turns was used as the load 6 in the circuit shown in FIG. DC power supply circuit has 140V, discharge capacitor 5
There is a potential difference of 580V between both ends, and each potential difference does not change as the oscillation frequency is adjusted, and stable and strong oscillation continues, and almost no heat is felt in the entire pulse generation circuit, including the choke coil. Ta.

Example 3 Example 2 except that the discharge capacitor was changed to 5.3μF
conducted under the same conditions. There was a potential difference of 140V in the DC power supply circuit and 420V between both ends of the discharge capacitor, and there was no change in each potential difference as the oscillation frequency was adjusted, and stable and strong oscillation continued. In addition, although some heat was felt in the transformer of the additional power supply circuit, the temperature remained below 10 degrees above the room temperature even after long-term use, and there was no problem in using it in a sealed device.

Example 4 The same conditions as in Example 2 were carried out except that the discharge capacitor was changed to 13 μF. There is a potential difference of 140V in the DC power supply circuit and 280V across the discharge capacitor, and each potential difference does not change as the oscillation frequency is adjusted.
Stable and strong oscillation continued. In addition, although some heat was felt in the transformer of the additional power supply circuit, the temperature remained below 10 degrees above the room temperature even after long-term use, and there was no problem in using it in a sealed device.

[Effects of the invention] Heat loss is reduced by converting the electrical energy that was lost as heat in the charging resistor into a DC power supply and connecting it in series to the power supply so as to increase the voltage on the DC pulse generation circuit side. By suppressing the discharge voltage and increasing the discharge voltage, the power efficiency of the pulse generator was improved, and the output was increased and the device was made smaller at the same time.

[Brief explanation of the drawing]

Figure 1 is a conventional example, Figure 2 is a conceptual diagram of the device in Figure 1, and Figure 3 is a conceptual diagram of the device in Figure 1.
The figure is a conceptual diagram of the device of the present invention, FIG. 4 is an embodiment of the present invention,
5, 6, 7, and 8 show other embodiments of the present invention. In the drawing, 1 is a rectifying element, 2 is a power supply smoothing capacitor, 3 is a choke coil, 4 is a rectifier, 5 is a discharge capacitor, 6 is a load, 7 is a variable resistor, 8 is a trigger diode, 9 is a relaxation oscillation capacitor , 10 is a thyristor, L. R is charging resistor

Claims (1)

[Claims] In a DC pulse generator in which a DC power supply circuit is connected in series with a DC pulse generation circuit consisting of a discharging capacitor, a switching element, and a control circuit that controls the switching frequency of the switching element, the DC pulse generation circuit is connected between the DC power supply circuit and the DC pulse generation circuit. A DC pulse generator characterized in that a choke coil and a rectifier are connected in series in accordance with the forward direction of the DC current.