JPH04193074A - Double voltage charging circuit - Google Patents

Abstract

PURPOSE:To get stable circuit operation and enable effective use of surplus energy by equipping it with a energy regenerating circuit, which consists of a series circuit connected in parallel with a capacitor and an inverter converting the power accumulated in a capacitor. CONSTITUTION:When discharge is started, the charges accumulated in capacitors C1 and C2 are injected into discharge load, but the matching between circuit impedance and load impedance is not taken, the surplus energy not consumed in the discharge load 10 is charge in the shape of reverse voltage in the capacitors C1 and C2. This reverse voltage is in the direction of forwardly biasing with a diode Dr, the surplus energy accumulated in the capacitor C2 is discharged to the capacitor for regeneration more quickly by the series resonance circuit consisting of the capacitor C2, a transformer Tr2, and a capacitor Cr for regeneration. The power accumulated in the capacitor Cr for regeneration is converted into AC power by an inverter 21, and is regenerated into AC power source 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a voltage doubler type charging circuit used in a high voltage pulse power source of a discharge pumped laser device.

(Prior Art) In a high-voltage pulse power supply for a discharge-excited laser, a voltage doubler type charging circuit as shown in FIG. 3 is used for the purpose of reducing the voltage duty of a switch. The circuit operation of FIG. 3 will be explained using the waveforms of FIG. 4.

In FIG. 3, AC power from an AC power source 1 is full-wave rectified by a rectifier 3 and charged into a smoothing capacitor Cs. Here, in order to suppress fluctuations in the terminal voltage of the smoothing capacitor Cs, the capacitance of the smoothing capacitor Cs is set to a sufficiently large value. By turning on the charging switch SWI, the capacitors C1 and C2 are resonantly charged in parallel via the transformer Tri. At this time, capacitors C1 and C2 are charged to a voltage approximately twice the secondary voltage E of transformer Tri (t
j) 6 After charging is completed, when the reversing switch SW2 is turned on at time t1, the charge accumulated in the capacitor c1 flows through the path of the capacitor c1 → the inverting actuator L2 → the reversing switch SW2 → the capacitor c1, and the electric charge accumulates in the capacitor C1.
The voltage at is reversed (t, = between t1 and t2). The saturable reactor SR is set in advance to saturate at t=12, when the voltage reversal of C1 is completed, that is, the series summed voltage of capacitors c1 and C2 reaches its peak. The saturable reactor SR becomes conductive, the charges in the capacitors C1 and C2 are transferred to the peaking capacitor Cp, and at the same time the discharge load 1 is transferred to the peaking capacitor Cp.
0 voltage increases. When this voltage becomes equal to or higher than the discharge starting voltage, discharge starts, and the charges stored in the capacitors C1 and C2 are injected into the discharge load 10 and consumed (t,
= t, between 2 and t3).

(Problem to be Solved by the Invention) In such a conventional voltage doubler type charging circuit, if the impedance of the circuit leading from the peaking capacitor Cp to the discharge charge of The energy used is completely consumed. However, in reality, the circuit impedance is larger than the discharge resistance and there is no matching, so the energy injected from the capacitors C1 and C2 is not completely consumed, and this surplus energy is transferred to the capacitors C1, C2.
is recharged in the form of reverse voltage. The surplus energy accumulated in the capacitor c1゜C2 is once blocked by the saturable reactor SR, but when the saturable reactor SR is saturated again, it is transferred to the peaking capacitor Cp again, and the voltage of the discharge load 1゜ increases. The postvoltage caused arc discharge and other factors that made the circuit operation unstable. Moreover, a loss occurs in the discharge load 1o and the reversing switch SW2 due to the post-current flowing due to this surplus energy, and an unnecessary negative phase is applied to the circuit components.

In view of the drawbacks of the conventional technology, the present invention aims to regenerate the surplus energy recharged in the capacitor C2 to the power source.
It is an object of the present invention to provide a voltage doubler charging circuit that provides stable circuit operation and enables effective use of surplus energy. 5 (Structure of the invention) (Means for solving the problem) To achieve the objective 17:, as shown in FIG.
6. Equipped with an energy regeneration circuit 20 consisting of a series circuit consisting of r, l-7less T r 2, and a capacitor Cr, and an inverter 21 that converts the power stored in the capacitor Cr into AC power 6 (Function) Main energy regeneration By equipping the circuit, the surplus energy recharged in the form of a reverse charge H to the capacitor (2) can be quickly discharged, and the energy can be regenerated into the power supply, so that no voltage is applied to the load afterwards. Moreover, surplus energy can be used effectively.

(Example) An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, the same numbers as in FIG. 3 indicate the same components. In Figure 1, the diode Dr and transformer Tr2 are connected in a direction that does not affect the charging of the capacitor c2.
A series circuit consisting of capacitor Cr and capacitor C2 is
Inverter 2 is connected in parallel to capacitor Cr.
1 is connected.

The output of the inverter 21 is connected to the output of the AC power supply 1.

When the capacitors C1 and C2 are resonantly charged in parallel by the DC type wX2, the diode Dr (7) is connected in a direction that blocks the charging voltage, so that it does not affect the charging operation of the capacitor C2. Capacitor C1 and 0
After 2 charging is completed.

The inverting switch SW2 is turned on, circuit resonance occurs in the closed circuit consisting of the capacitor C1, the inverting reactor L2, and the inverting switch SW2, and the voltage of the capacitor C1 is inverted. When this voltage reversal is completed, the saturable reactor SR becomes conductive, and the charges accumulated in the capacitors C1 and C2 are transferred to the peaking capacitor Cp, and the discharge load 1
When the zero voltage becomes equal to or higher than the discharge start voltage, discharge starts.

When the discharge starts, the charges accumulated in the capacitors CL and C2 are injected into the discharge load 10, but since the circuit impedance and the load impedance are not matched, the surplus energy not consumed in the discharge load 10 is injected into the capacitor C1. and C2 are charged in the form of a reverse voltage. The process up to this point is the same as in the conventional example. Since this reverse voltage is in the direction of forward biasing the diode Dr, the surplus energy stored in the capacitor C2 is quickly transferred to the regenerative capacitor Cr by the series resonant circuit consisting of the capacitor C2, the transformer T r 2, and the regenerative capacitor Cr. is discharged. The electric power accumulated in the regeneration capacitor Cr is converted into AC power by the inverter 21, and the AC power source 1
will be regenerated.

Therefore, according to this embodiment, the surplus energy stored in the capacitor C2 is quickly discharged and the energy is regenerated to the AC power supply 1, so that no voltage is applied to the load after the fact.

Surplus energy can be reused.

As explained above, according to the above-mentioned embodiment, since the energy regeneration circuit 20 for regenerating surplus energy to the AC power supply 1 is added, not only no voltage is generated after the fact to the load, but also the surplus energy is effectively used. can be used.

Although the present invention has been described using as an example a method of regenerating surplus energy into an AC power source as AC power, it is not limited to this method. for example.

As shown in Figure 2, a rectifier 22 is connected to the output of the inverter 2I.
The effect of the present invention also applies when the DC power is converted to DC power by connecting it and regenerated to the smoothing capacitor Cs of DC power supply 2
Of course, the effect is effective.

〔Effect of the invention〕

As described above, according to the present invention, by providing the energy regeneration circuit 20 that promptly discharges the surplus energy recharged in the form of reverse voltage in the capacitor C2 and regenerates it to the power supply, the load is supplied with a post-voltage voltage. Not only is it possible to obtain stable discharge without generating energy, but also because surplus energy can be used effectively, the energy efficiency of the circuit can be improved.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing one embodiment of the present invention, Fig. 2 is a circuit diagram showing another embodiment of the invention, Fig. 3 is a circuit diagram showing a conventional voltage doubler charging circuit, and Fig. 4 is a circuit diagram showing an embodiment of the present invention. The figure is a waveform diagram showing the circuit operation of the voltage doubler charging circuit. 1...AC power supply, 2-.DC power supply, 10.-
・Discharge load, 20...Energy regeneration circuit, 21...
・Inverter, 22... Rectifier, C1, C2...
・Capacitor. Cp...Peaking capacitor, SW2...Reversing switch, Ll...Grounding reactor 5 [,2 reversing reactor. L3...Charging reactor. SR...Saturable reactor, Tr2...Transformer,
Dr...diode, Cr...regenerative capacitor Representative Patent Attorney Noriyuki Chika

Claims (2)

[Claims] (1) A first capacitor and a second capacitor are charged in parallel by a DC power source, a series resonant circuit including a first reactor and a switch is connected in parallel with the first capacitor, and the first After the charging of the second capacitor is completed, the switch is turned on to cause circuit resonance, thereby inverting the voltage of the first capacitor, and the series added voltage of the first capacitor and the second capacitor becomes the first capacitor.
and a voltage doubler charging circuit in which the voltage is approximately twice the initial charging voltage of the second capacitor, further comprising an energy regeneration circuit that regenerates surplus energy accumulated in the second capacitor to a power source. A voltage doubler charging circuit. (2) In claim (1), the energy regeneration circuit comprises the second capacitor connected in parallel with the second capacitor.
A series circuit consisting of a diode, a transformer, and a regenerative capacitor connected in a direction that does not affect the charging of the capacitor, and a series circuit that is connected in parallel to the regenerative capacitor and converts the surplus power accumulated in the regenerative capacitor into AC power. A voltage doubler charging circuit characterized by comprising a converting inverter.