JPS58141678A - High voltage power source - Google Patents

Abstract

PURPOSE:To enhance the efficiency of a high voltage power source and to reduce the noise of the power source by controlling constantly the load current by the detection signal of a load current detector in a power regulator. CONSTITUTION:A switching transistor Tr1 repeats ON and OFF by the output signal of an oscillator 4. A flyback transformer T1 stores and discharge energy to match the ON or OFF of the transistor Tr1, and vibrates in the sinusoidal wave of the prescribed frequency determined by the distributed capacity of the transformer T1 and an external condenser C1. Since a power regulator 1 maintains the load current detected by a load current detector 3 constant, it controls the applied voltage at the primary side or the current flowing time to the primary side. In this manner, the constant current characteristics are held, thereby obtaining stable output waveform with high efficiency and less noise.

Description

[Detailed description of the invention] The present invention relates to a high voltage power supply device.

Conventionally, this type of device was used by enemy soldiers as a git lance.
iIl! There are those that use a single type inverter or a passive type inverter. However, high-voltage power supplies using iron-resonant lances have drawbacks such as large size and heavy weight.
Furthermore, high-voltage power supplies using automatic inverters or passive inverters have the drawback of large switching currents and large noises.

The present invention eliminates the above-mentioned drawbacks and at the same time provides a compact and lightweight high-voltage power supply device. The present invention also provides a high-voltage power supply device with high efficiency and low noise.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the configuration of a high voltage power supply device according to the present invention.

In the figure, 1 is a flypack transformer, 2 is a high-voltage rectifier circuit, 3 is a load current detection circuit, 4 is a generator 11 circuit, 1 is a power adjustment circuit s, PXeP# is an output terminal.Hereafter, the items that perform the same operation will be explained. The @ circuits with the same number are explained. The switching transistor Trz repeatedly turns on and off in response to the output signal of the oscillation circuit 4. The flyback transformer T1 stores energy when the switching transistor Try is on, and stores the energy when the switching transistor Try is off, using the inductance seen from the primary side, the distributed capacitance of the flyback transformer condenna)
The leakage inductance of the 0 or 7 Twipakkutotsuns T, which is configured to emit sinusoidal vibration with a constant frequency determined by 01, resonates with the distributed capacitance at higher frequencies to increase efficiency. Set its value. The power adjustment circuit 1 controls the voltage applied to the primary side or the energization time to the primary side in order to keep the load current detected by the load current detection circuit 6 constant.

In this embodiment, since the flyback transformer T1 is used, noise is low and efficiency is high.

Figure 2 shows the signal waveforms of each part.

The output signal of the swing circuit 4 (i.e., switching) is the base drive signal of the two transistors Tri, the top is the collector voltage waveform of the switching transistor Trz, the number 8 is the output waveform of the secondary winding of the flyback transformer T1, and the wings are the switching)
It is a collector current waveform of run raster Trz. In addition, when there is no member diode D1, the collector voltage waveform becomes a signal wave 11w1 (as shown by the one-dot chain line).Of member diode 1 conducts to the node of the switching transistor Try, and the switching transistor Trz
It plays the role of returning energy to the power adjustment circuit 1 while ensuring that the power is maintained. Further, in the output waveform (signal waveform opening) of the secondary @ line of the flyback transformer T, in a steady state, the negative partial voltage becomes almost equal to the amplitude. In the signal waveform portion, when the switching transistor Trz is off, the retata voltage rises in a sine wave. Therefore, switching loss at this time is small and efficiency is high.

Also, when the switchboard transistor Try is on, the flefter current is close to zero, so any current at this time is very small. Regarding noise, the collector voltage waveform is a sine wave as shown in the signal waveform, and the collector current Since the waveform becomes a linearly increasing waveform as shown in the signal waveform JLK, high frequency noise is extremely reduced. In addition, by increasing the ON time of the switching transistor Trz, a considerable voltage boost can be achieved even with IFCII, and as shown in the signal waveform, the rectified output voltage can reach the full peak value, so the boost ratio of the flyback transformer T1 can be reduced. I can do it.

In this embodiment, the step-up ratio of the transformer can be reduced to 1 AO to 1/20. Therefore, the flyback transformer 〒1 can be made smaller and lighter. Further, since the output waveform of the secondary winding is outputted in the same manner as the signal waveform, the reverse withstand voltage of the diode in the high voltage rectifier circuit 2 may be small.

FIG. 6 is an example of the high-voltage power supply device shown in FIG. 1 shown in more detail. Here, V(101Vm) is the input power supply voltage, and the same applies to other figures below.

In Fig. 3, in the load current and current detection circuit s,...
, , , /- voltage Vs due to sampling resistor RsK
cause The error amplifier Q1 in the power adjustment circuit 1 is P
, to control the primary winding voltage of the flyback transformer T by comparing the voltage vs with the reference voltage applied to the flyback transformer T. As a result, the output waveform of the secondary winding i1 is stabilized, and constant current characteristics are maintained. Furthermore, if the circuit is configured as shown in FIG. 2, the efficiency is high, so that the amount of power 11111i for constant current control can be relatively small.

In the embodiment shown in Fig. 3, the power control circuit 1 is composed of a series regulator, but as shown in Fig. 1E4, it can also be composed of an automatic series regulator to control the energization time. Yes - In Fig. 4, error amplification 1tQ
a operates as a hunparator,) run raster Trs,
Tr4 operates as a switching) run raster.

Figure 5 shows another embodiment of the present invention.The circuit in Figure 5 detects the load current and performs switching.
This is an example of controlling the energization timing. Further, the output terminals in this case are Pi-z, Pi-as Ps, and the high voltage rectifier circuit is 2-1.2-2. The operating waveform diagram of each part is explained according to Fig. 6. Otmplinder resistor R
The load current detected at PsK is compared with the reference voltage applied at PsK by an error amplifier Q1. If the load current is greater than the set value of the reference voltage applied PsK, the error amplifier Q
1 is assumed to be at level α' in the waveform diagram 1. This output α' is an error amplifier 'IjQ that operates as a comparator.
A signal 1 obtained by integrating the output of the oscillation circuit 4 by the integrating circuit 5 is added to the (+) input of the error amplifier Qs. The output Trs is compared to obtain the output T. T is the base drive transformer of the switching transistor τrz, and when the two transistors Trs become conductive (at the timing of the high level of the output), the base voltage of the switching transistor Trz is made positive. The timing of the high level of the output signal becomes the conduction time of the switching transistor Try, that is, the energy storage time in the flyback transformer Tl.Therefore, the collector output of the switching transistor Trz becomes small as shown in the waveform diagram C, and 72 steps. Back transformer T
1's output voltage is also reduced to reduce the load current. Conversely, if the load current is smaller than the set value of the reference voltage applied to P, the output of the error amplifier Q1 will be at level α' in waveform diagram 1.
Assume that ◎This output α' is the error amplifier Q as mentioned above.
s←) is added to the input. (10) of error amplification WjQm
A signal a is applied to the input and compared with the output α' to obtain the output b'. As mentioned above, since the timing of the high level of the output b' becomes the conduction time of the switching transistor Try, the energy storage time of the flyback transformer T1 increases.
As shown in diagram G', the collector output of ry increases, and the load current increases.

Further, 2-1 is one path for feeding power to a high-voltage load different from 2-2, and LKDl is an LED for indicating high-voltage generation.

Furthermore, in the embodiment shown in the IF5 diagram, the power adjustment circuit 1 is changed from a series resulator to control of the energization time, so that the power loss of the power adjustment circuit 1 can be significantly reduced.

For this reason, it is possible to reduce the dust and weight of the entire high-voltage power supply. In addition, since the allowable fluctuation range of the input power supply voltage VOO can be widened, the temperature rise of other related devices can be suppressed.

However, in the embodiments shown in FIGS. 1, 184, and 184, the output winding is one winding, but as shown in FIG. According to the present invention, constant current characteristics can be maintained and a stable output waveform can be obtained.In addition, the high efficiency can be increased and noise can be reduced, and the step-up ratio can be reduced, so it can be made smaller and lighter. I can do it.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an example of the configuration of a high voltage power supply according to the present invention, Fig. 2 is an operation waveform diagram of each part, Fig. 6 is a route diagram of the high voltage power supply according to the present embodiment, and Fig. A circuit diagram of a high voltage power supply device using a gelator,
Figure 5 is the other 1! A circuit diagram of the high voltage power supply device in the example,
FIG. 6 shows the operating waveforms of each part of the 5th diagram. Here, T1 is a flyback transformer, 1 is a power adjustment circuit, 2 is a high voltage rectifier circuit, 5 is a load current detection circuit, 4 is an oscillation circuit, %D1 is a damper diode, Trz is a switching transistor, Qll Q & Ql #i error amplifier It is. Applicant: Nakayanon Co., Ltd. Kinsha Ichishinkei / Agent: Gi Marushima, 1t

Claims (1)

[Scope of Claims] (1) A flypack transformer that vibrates at a predetermined frequency, a load current detection circuit that detects a load current, and a power adjustment circuit, wherein the power adjustment circuit detects the load current detection circuit. A high voltage power supply device characterized in that the load current is controlled to be constant by a signal. (2) In order to control the load current to a constant value, the power adjustment circuit controls the voltage applied to the primary side of the power transfer transformer. power supply. (6) In order to control the load current to a constant value, the power adjustment circuit controls the time during which current is applied to the primary side of the flypack lance, power supply.