JPS62161582U - - Google Patents

Description

[Brief explanation of the drawing]

Figures 1 to 4 show examples of this invention. Figure 1 is a circuit diagram, and Figure 2 shows a power supply voltage of 240.
It shows the current waveform of the oscillation transformer 13 during AC operation in the case of V, where a is a waveform diagram of the primary current, and b is a waveform diagram of the primary current.
is a waveform diagram of the secondary current, and Figure 3 shows the power supply voltage at 240°C.
It shows the current waveform of the oscillation transformer 13 during charging in the case of V, where a is the waveform diagram of the primary current, and b is the waveform diagram of the primary current.
Figure 4 shows the current waveform of the oscillation transformer 13 during AC operation when the power supply voltage is 100V, where a is the waveform diagram of the primary current, and b is the waveform diagram of the primary current.
The waveform diagrams of the next current, Figures 5 and 6, show conventional examples. Figure 5 is a circuit diagram, and Figure 6 shows a power supply voltage of 2.
The figure shows the current waveform of the oscillation transformer 53 in the case of 40V, where a is a waveform diagram of the primary current, and b is a waveform diagram of the secondary current. DESCRIPTION OF SYMBOLS 1... Commercial AC power supply, 2... Rectifier circuit, 6... Inverter circuit, 7... Oscillation transistor, 8... Control circuit, 18... Control transistor, 19... Resistor, 2
0...Diode, 22...Resistor, 25...Capacitor, 27...Storage battery, 28...Switch, 29...Drive circuit.

Claims (1)

[Claims for Utility Model Registration] A power supply circuit that steps down the power supply voltage of a commercial AC power source using an inverter circuit to supply drive electricity to a drive circuit of an electrical device, and also supplies charging current to a storage battery of the electrical device, A rectifier circuit is connected to the commercial AC power supply, and the rectifier circuit is connected to the inverter circuit, and the base of the oscillation transistor of the inverter circuit is connected to the collector of the control transistor through a first resistor network. , the emitter of the oscillation transistor and the base of the control transistor are connected via a first voltage division point of a second resistor network, and the oscillation transistor of the inverter circuit is connected to the second voltage division point. By connecting a switch that switches between the drive circuit and the storage battery connected to the secondary winding of the transformer to switch between AC operation and charging of the electrical equipment, the power supply voltage of the commercial AC power supply is changed. Fluctuations in the oscillation frequency of the inverter circuit due to changes are controlled by the control transistor to keep the secondary current of the oscillation transformer of the inverter circuit constant, and when the electrical equipment is operated with alternating current, the switch is turned on, the parallel circuit of the capacitor and the resistor of the second resistor network connected to the emitter circuit of the oscillation transistor is short-circuited, and the oscillation frequency of the oscillation transistor is increased to increase the oscillation frequency of the drive circuit. When charging the storage battery, the switch is turned off, the parallel circuit is inserted into the emitter circuit of the oscillation transistor, the oscillation frequency of the oscillation transistor is reduced, and the storage battery is charged. A power supply circuit characterized by a small current.