JP2000078837A - Power source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute a stable loading operation scarcely obstructed by a noise generated from a circuit by inhibiting a switching operation of a switch means when an output voltage of a voltage converting means is given to a load. SOLUTION: A microcomputer 7 processes an output signal of a receiver 6, outputs a control signal, locks or unlocks a door of an automobile, processes to read a reception signal (a), and outputs an intermittent operation signal (b) and a control signal (c) of a switching operation. A driving circuit 11 stops its drive in the state that a control transistor Tr4 is ON, or drives in the state that the transistor Tr4 is OFF. While an intermittent circuit 5 is being energized, a switching power source is stopped, power charged in a capacitor is stabilized by a 5V-regulator 4, and supplied. Thus, power consumption of the power source is reduced, the switching operation is controlled, and an influence of the switching noise of a load can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a power supply for supplying power to a load.

[0002]

2. Description of the Related Art Recently, a keyless entry device for remotely locking and opening a door of an automobile by using radio waves or the like has been frequently used. This device is used for opening and closing the door while the vehicle is stopped. Therefore, it is necessary to keep the receiver operating while the vehicle is stopped. Therefore, a device for operating with minimal power consumption has been devised. For example, the configuration diagram shown in FIG. 15 shows an example of a conventional power supply device.
Is a 12-volt or 24-volt battery that is mounted on the vehicle. 101 is a keyless entry receiver 103
The output voltage of the battery 100 is adjusted to a required voltage (5 volts) by a series regulator circuit for supplying a required voltage (5 volts in this example). Reference numeral 102 denotes an intermittent circuit constituted by transistors and the like, which is controlled by the microcomputer 104, intermittently outputs the voltage (5 volts) output from the series regulator 101 at a required timing, performs a receiving operation at a required interval, and reduces power consumption. It is designed to save money. Reference numeral 103 denotes a keyless entry device receiver, which is a keyless entry device transmitter 1
05 is received. The received signal is analyzed by the microcomputer 104 and when the codes match, a control signal for opening and closing the locking of the vehicle door is output, and the locking operation of the locking device of the vehicle door is performed. In the keyless entry device that operates in this manner, it is necessary to keep the receiver operating. Therefore, the vehicle battery is consumed unless it is operated with as little power consumption as possible to maintain the operation state for a long time.

[0003]

SUMMARY OF THE INVENTION For this reason, Japanese Unexamined Patent Publication No.
It is conceivable that a switching regulator is used as in Japanese Patent Application Laid-Open No. 217530, and this is provided before the series regulator to reduce the loss. However, if switching is performed when a signal is received by the receiver, noise is radiated. There was a possibility of malfunction.

[0004] The present invention provides a power supply device in which power consumption is further reduced in consideration of the above-described situation. Since a switching circuit is used, a power supply capable of performing a stable load operation which is not easily disturbed by noise generated from the circuit. The purpose is to provide the device.

[0005]

In order to solve the above-mentioned problems, the present invention has a switch means and a charging / discharging circuit connected to a power supply, wherein a switching operation of the switching means and a time constant of the charging / discharging circuit are performed. A power supply device comprising: a switching regulator that outputs a voltage having a predetermined waveform; and a voltage conversion unit that converts a voltage output from the switching regulator to a constant voltage, and applies an output voltage from the voltage conversion unit to a load. Controlling the supply of the output voltage from the voltage converting means to the load, and prohibiting the switching operation of the switch means when the output voltage from the voltage converting means is applied to the load. It is characterized by comprising control means.

Further, the control means applies an output voltage from the voltage conversion means to a load, and inhibits a switching operation of the switch means during a period in which the load should perform a stable operation. I do. Also,
The control means detects an output voltage of the switching regulator and directly controls a switching operation of the switch means according to the magnitude of the output voltage.

[0007] Further, the invention is characterized in that the control means continuously turns on the switch means when a period in which the load is to perform a stable operation ends.
Further, a timer means for operating the switching means and activating the control means is provided. Further, the control means is to supply a pulse signal to the switch means to perform a switching operation, and the control means controls the number of the pulse signals according to the magnitude of the output voltage. It is characterized by the following.

Further, the load is a receiving means for receiving an external radio wave. The load is a receiving unit that receives an external radio wave, and the period in which the stable operation is to be performed is a period in which the receiving unit performs a process of receiving an external radio wave.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a first embodiment of the present invention. Reference numeral 1 denotes a vehicle-mounted battery which is used as a power supply of the apparatus and normally outputs 12 V or 24 V. The negative side of the battery 1 is connected to the vehicle body. Tr1 is a switching transistor constituting a switching circuit, a collector is connected to the plus terminal of the battery 1, and a signal applied from the emitter to the collector (output of the drive circuit)
And the switching operation is started.
Reference numeral 3 denotes a smoothing circuit including a diode Di, a ring L, and a capacitor C. The output of the capacitor C is charged when the switching transistor Tr1 is turned on, and discharged when the switching transistor Tr1 is turned off.

Reference numeral 4 denotes a regulator circuit which converts the discharge voltage output to Vout into a constant voltage (5 V in this example) required for the power supply on the receiver side of the keyless entry device and outputs the same. Reference numeral 5 denotes an intermittent means for reducing power consumption. A transistor Tr2 for turning on the transistor 4 to supply a voltage from the regulator 4 to the receiver 6 is provided, and a voltage required for a receiver side power supply of the keyless entry device is determined. It is output by intermittent operation. Reference numeral 6 denotes a receiver of the keyless entry device, which receives and outputs a radio signal from the transmitter 12 (built in an engine key or the like). Reference numeral 7 denotes a microcomputer (microcomputer) that processes the output signal of the receiver 6 (if it is confirmed that the signal is a radio signal from the transmitter 12), outputs a control signal, and performs locking and unlocking operations of the door of the automobile. .

[0011] Further, it reads and processes the received signal a, and outputs an intermittent operation signal b and a control signal c for switching operation. 8 is a reference voltage source. Reference numeral 9 denotes a differential amplifier (comparator) in which the voltage (Vout) output from the smoothing circuit 3 is connected to an inverting input (-) through a resistor R1 and the reference voltage source 8 is connected to a non-inverting input (+). When the voltage (Vout) output from the circuit 3 is lower than that of the reference voltage source 8, a signal at the “H” level is output. Reference numeral 10 denotes a differential amplifier (comparator) which receives the output of the differential amplifier 9 at a non-inverting input (+) and a signal of a predetermined frequency transmitted from the oscillator 12 at an inverting input (-) to perform a predetermined switching operation. Be started. Reference numeral 11 denotes a drive circuit for driving the switching transistor Tr1 on and off. When the control transistor Tr4 is in an on state (a state in which an "H" level signal is being input to the base), the driving thereof is stopped and an off state (the base is "L"). (A state where a "level signal is input"), the driving is enabled.

Next, the waveform of each part will be described. FIG. 2 shows the waveform of each part in FIG. 1. The output waveform of the transistor Tr1 of the switching circuit is obtained by periodically switching the voltage of the battery 1 at intervals determined by the frequency of the oscillator. Then, the capacitor C is charged by the time constant of L and C of the smoothing circuit 3, and when the switching signal becomes 0, the capacitor C is gradually discharged as shown by Vout. When the voltage falls below a predetermined value (5 V), the differential amplifiers 9 (comparators) and 10 operate to output the next switching signal. This output is stabilized by the regulator 4 to a predetermined voltage (5 V), input to the intermittent circuit 5, and supplied to the power supply of the receiver at predetermined intervals.

Next, a microcomputer (microcomputer) 7
Will be described with reference to FIGS. 2 and 3. FIG. 3 is a flowchart showing the processing of the microcomputer 7. Note that the keyless entry device always performs a receiving operation while maintaining an operation state. In step S1, the intermittent circuit 5 is turned on (the control signal b of the microcomputer 7 becomes the "H" level signal).
Then, the power of the receiver 6 is turned on as shown in FIG. Next, the process proceeds to step S2, in which the switching operation of the switching transistor Tr1 is forcibly stopped irrespective of Vout (the control signal c of the microcomputer 7 becomes "H" level), and then proceeds to step S3. In step S3, it is determined whether or not there is an output of the receiver 6, that is, whether or not the receiver 6 has received any code signal from the outside. If an output is detected, the process proceeds to step S4. If no output is detected, the process proceeds to step S7. Move on. In step S4, a code input process is performed based on the output signal of the receiver 6, and the process proceeds to step S5. Step S
At 5, it is determined whether or not the input-processed code matches the code of the vehicle stored in advance. If the code matches, the process proceeds to step S6. If not, the process proceeds to step S7. In step S6, the lock of the door of the own vehicle is locked or unlocked, and the process proceeds to step S7. Step S
At 7, the intermittent circuit 5 is turned off (the control signal b from the microcomputer 7 is at "L" level), and the routine goes to Step S8. In step S8, the prohibition of switching is released as shown in FIG. 2 (the control signal c from the microcomputer 7 is at the "L" level).
I do. Thereafter, the switching operation is performed according to Vout regardless of the microcomputer 7.

As described above, according to the first embodiment, when the output voltage from the voltage converting means is applied to the load, the control means for inhibiting the switching operation of the switching means is provided. Is stopped, the power charged in the capacitor is stabilized and supplied by the regulator means, thereby providing a power supply device in consideration of power consumption reduction, and the receiver 6 receives the radio wave (code signal). In this case, the switching operation is prohibited to prevent a malfunction due to switching noise.

Next, a second embodiment will be described. FIG. 4 is a diagram showing waveforms at various points in the second embodiment of the present invention. In the second embodiment, the switching prohibition period is limited, and the switching operation is prohibited only during the period in which the receiver 6 should perform stable reception. The processing of the microcomputer 7 in that case will be described with reference to FIG. I do. The configuration is based on FIG. 1 and is also described with reference to FIG.

In step S20, the intermittent circuit 5 is turned on (the control signal b from the microcomputer 7 is set to the "H" level), the power supply of the receiver 6 is turned on as shown in FIG. 4, and the process proceeds to step S21. In step S21, it is determined whether or not a predetermined time (the time required for starting up the receiver 6) has elapsed.
Then, if the time has not elapsed, the process waits until the predetermined time has elapsed. During this time, as shown in FIG. 4, the switching transistor Tr1 is turned on according to Vout. After a lapse of a predetermined time, the process proceeds to step S22, and as shown in FIG. 4, the switching operation is prohibited (the control signal c from the microcomputer 7 is maintained at the “H” level), and the process proceeds to step S23. Therefore, the switching transistor Tr1 does not perform a switching operation as shown in FIG. During this prohibition period, the receiver 6 performs a process of receiving an external radio wave. In step S23, the presence or absence of the output of the receiver 6 is confirmed. If there is an output, the process proceeds to step S24.
Move to 27. In step S24, a code input process is performed, and the routine goes to step S25. In step S25, it is confirmed whether or not the input-processed code matches the code of the own vehicle stored in advance.
If they do not match, the process moves to step S27. Step S2
At 6, the door lock is locked or unlocked, and the routine goes to Step S27. In step S27, as shown in FIG. 4, the intermittent circuit is turned off (the control signal b from the microcomputer 7 is set to "L").
Level), and then proceeds to step S28. In step S28, the prohibition of the switching operation is released.

As described above, in the second embodiment, the output voltage from the voltage conversion means is applied to the load, and the switching operation of the switching means is inhibited during the period in which the load should perform a stable operation. Is set, and the switching operation is prohibited when the receiver 6 performs stable reception after waiting for this time. Therefore, it is not affected by the noise generated by the switching operation,
Further, since the switching is inhibited only for a necessary period, there is no fear of the voltage shortage during the operation of the receiver 6, and the capacitor C
Need not be increased.

Next, a third embodiment of the present invention will be described. FIG. 6 is a configuration diagram showing a third embodiment of the present invention.
The reference numerals 1 to 9 in FIG. 6 are the same as those in FIG. Reference numeral 20 denotes a switching transistor constituting a switching regulator circuit, which corresponds to the switching transistor Tr1 in FIG. 1, and performs a switching operation by a control signal from the microcomputer 7. That is, in the first and second embodiments, the switching operation is basically performed independently of the microcomputer, whereas in the third embodiment, the microcomputer controls the switching operation.

FIG. 6 is a block diagram showing a third embodiment.
The comparator 9 compares the voltage of Vout with the voltage of the reference voltage source 8, and outputs a signal A1 to the microcomputer 7 when Vout falls below the reference voltage source 8. The microcomputer 7 sets the B1 signal to the H level in response to the A1 signal to operate the switching transistor 20. The processing of the microcomputer 7 of the third embodiment will be described with reference to the flowchart of FIG. In step S30, it is determined whether or not the output voltage of the comparator 9 is lower than a predetermined value based on the signal A1, and if it is lower, the process proceeds to step S32.
Move to step S34. In step S32, the B1 signal is set to the "H" level for a certain period of time, and the process proceeds to step S33.
In step S33, the predetermined time B1 is set to the “L” level, and the process returns to step S31. In other words, when the value is lower than the specified value, the switching transistor 20 performs the switching operation for one pulse. In step S34, the intermittent circuit 5 is turned on (the control signal b from the microcomputer 7 is at "H" level).
The process proceeds to step S35, and waits for a predetermined time to elapse, and then proceeds to step S36. During this time, step S3
Switching control from 0 to step S33 may be performed. After a lapse of a predetermined time, the switching control is prohibited (the control signal B1 from the microcomputer 7 remains at the “L” level). In step S36, it is determined whether or not there is an output from the receiver 6. Move to S37. If there is no output, step S40
Move on to In step S37, a code input process is performed on the output signal of the receiver 6, and the process proceeds to step S38, where it is determined whether or not the code matches the code of the own vehicle. If so, the process proceeds to step S39. If they do not match, step S4
Move to 0. In step S39, the door lock is locked or unlocked, and the process proceeds to step S40. Step S
At 40, the intermittent circuit 5 is turned off.

As described above, in the third embodiment, the control means detects the output voltage of the switching regulator by the microcomputer and directly controls the switching operation of the switch means according to the magnitude of the output voltage. And can be realized at low cost without the need for the switching circuit. FIG. 8 is a diagram showing waveforms at various points in the fourth embodiment of the present invention. In the fourth embodiment, when a radio wave is detected by the receiver, the switching transistor 20 is maintained in the ON state, and the power from the battery 1 is directly supplied to the 5V regulator 4. The configuration of the present embodiment is based on the configuration shown in FIG. 6, and FIG. 9 is a flowchart showing the processing of the microcomputer 7, and the present embodiment will be described with reference to FIG. 8 and FIG.

In step S50, the output voltage of the comparator 9 is read as in the third embodiment, and the flow advances to step S51. In step S51, it is determined whether the output voltage of the comparator 9 is lower than a predetermined value. If the output voltage is lower, the process proceeds to step S54. If the output voltage is higher, the process proceeds to step S52.
Move on to In step S52, the control signal B1 is set to the “H” level for a certain period of time, and the process proceeds to step S53. Step S
At 53, the control signal B1 is set to the “L” level for a fixed time, and the process returns to step S51. In step S54, the intermittent circuit 5 is turned on (the control signal b from the microcomputer 7 is at the "H" level), the process proceeds to step S55, and after waiting for a predetermined time, the process proceeds to step S56. During this time, the level of B1 may be controlled from the "H" level to the "L" level according to Vout as shown in FIG.

In step S56, as shown in FIG. 8, the switching control is prohibited (the control signal B1 from the microcomputer 7 remains at the "L" level), and it is determined whether there is an output from the receiver 6 and the output is determined. If there is, the process proceeds to step S57. If there is no output, the process moves to step S61. In step S57, in order to supply a stable voltage to the receiver 6, the switching transistor 20 is set to the through state (the control signal B1 from the microcomputer 7 is maintained at "H" level). Therefore, as shown in FIG. 8, the level of Vout is a state where the voltage from the battery 1 is directly applied. When there is a reception signal of the receiver 6, the control signal B1 is set to "H".
Get up to level. Therefore, instantaneous noise is generated. However, when the code input process is performed in step S58, the influence of the noise can be eliminated by performing the reading process after the noise is eliminated.

The flow shifts to step S58 to perform a code input process, and shifts to step S59. In step S59, it is determined whether or not the code matches the code of the own vehicle, and if they match, the process proceeds to step S60. If they do not match, the process moves to step S61. In step S60, the door lock is locked or unlocked, and the process proceeds to step S61.
In step S61, the intermittent circuit 5 is turned off and step S
The process proceeds to 62, where the control signal B1 from the microcomputer 7 is set to the “L” level.

As described above, in the fourth embodiment, the control means keeps the switch means on when the period during which the load stabilization operation is to be performed is completed.
A stable power supply can be performed without voltage drop after radio wave reception. Next, FIG. 10 is a configuration diagram showing a fifth embodiment of the present invention. This embodiment is based on the configuration of the third embodiment, and the same parts as those of the third embodiment shown in FIG. In this example, the timer 21 performs the switching control by the microcomputer 7 instead of the switching control. Reference numeral 21 denotes a timer which is provided outside the microcomputer 7 and controls activation of the microcomputer 7. The microcomputer 7 is in a sleep state until the timer 21 is activated, thereby saving power of the microcomputer 7.

The relationship between the microcomputer 7 of this embodiment and the timer 21 will be described in detail. The microcomputer 7 is activated by the rise of the activation signal from the timer 21, performs predetermined processing, and indicates the sleep period to the timer 21 after the processing is completed. The set signal is output and the sleep state is set again. Then, after the sleep period, the timer 21 repeats the process of giving the start signal to the microcomputer 7. When the start signal is rising, the timer 2
When 1 is reset, this start signal falls.

FIG. 11 is a diagram showing the waveform of each part in the fifth embodiment of the present invention. This operation will be described with reference to the flowchart shown in FIG. The microcomputer 7 starts up as shown in FIG. 11 in response to the interrupt process (start signal) from the timer 21. In step S70, it is detected whether or not there is an interrupt.
If no, go to another interrupt process. Step S
At 71, the intermittent circuit 5 is turned on (the control signal b from the microcomputer 7 is at the "H" level), the process proceeds to step S72, the initial processing of the input / output port is performed, and the process proceeds to step S73. In step S73, a reset signal is output to the timer 21, and the flow advances to step S74. At this time, the start signal from the timer 21 falls as shown in FIG. As a result, the control signal D1 for the switching operation for the switching transistor 20 is generated for one pulse, so that the switching transistor 20 performs the switching operation as shown in FIG. 11, but thereafter, since the control signal D1 becomes "L", the switching operation is performed. Is not done. Step S7
In 4, the presence or absence of an output signal from the receiver 6 is confirmed, and if there is an output signal, the process proceeds to step S75, and if it is determined that there is no output signal, the process proceeds to step S78. Note that a step of determining whether a predetermined time has elapsed may be inserted before step S74, and the process of step S74 may be performed after the predetermined time.

In step S75, a code input process is performed on the output signal of the receiver 6, and the flow shifts to step S76 to determine whether or not the code matches the code of the own vehicle. If they match, the flow shifts to step S77. If they do not match, the process moves to step S78. In the step S77, the lock of the door is locked or unlocked, and the process proceeds to a step S78. In step S78, a set signal indicating the sleep period is output to the timer 21 as shown in FIG. 11, and the process proceeds to step S79, where the intermittent circuit 5 is turned off (the control signal b from the microcomputer 7 is set at "L" level). The state shifts to (keep the current state), sleep (pause of operation of the microcomputer), or STBY (wait for the next operation).

As described above, in the fifth embodiment, the operation of the microcomputer is stopped by providing the timer for switching the switching means and activating the control means, thereby reducing the power consumption of the microcomputer 7 and reducing the processing load. Can be light. FIG. 13 is a diagram showing waveforms at various points in the sixth embodiment of the present invention. In the sixth embodiment, the switching operation (the number of pulses) is controlled in accordance with the voltage from the switching transistor 20. The configuration is based on the configuration diagram shown in FIG. The operation of this figure will be described with reference to the flowchart of FIG.

In step S80, the intermittent circuit 5 is turned on (the control signal b from the microcomputer 7 is at the "H" level), and the process proceeds to step S81, where the switching transistor 20 is transferred to the switching transistor 20 based on the previously obtained N value as shown in FIG. Then, N pulses are output as the control signal B1, and the routine goes to Step S82. In step S82, the process proceeds to step S83 after a predetermined time has elapsed. In step S83, the switching operation is prohibited (the control signal B1 from the microcomputer 7 remains at the "L" level), and the presence or absence of the output signal (a) from the receiver 6 is checked. Transfer,
When it is determined that there is no output signal, the process proceeds to step S91.

In step S84, the output signal of the receiver 6 is subjected to code input processing, and the flow shifts to step S85 where the output voltage A1 of the comparator 9 is read and the flow shifts to step S86.
In step S86, it is determined whether the voltage is higher than the reference voltage. If the voltage is higher, the process proceeds to step S88, and if lower, the process proceeds to step S87. In step S88, the number of pulses is set to N = N-1, and the process proceeds to step S89. Step S8
At 7, it is determined whether the voltage is lower than the reference voltage. If the voltage is lower than the reference voltage, the process proceeds to step S90. If the voltage is higher, the process proceeds to step S89. In step S90, the number of pulses is set to N = N + 1,
Move to step S89. In step S87, it is determined whether or not the codes match, and if they match, step S92
Then, the door lock is locked or unlocked, and the routine goes to Step S91. In step S91, the intermittent circuit 5 is turned off (the control signal b from the microcomputer 7 is at "L" level).

As described above, in the sixth embodiment, the microcomputer 7 performs a switching operation by giving a pulse signal to the switch means, and controls the number of pulse signals according to the magnitude of the output voltage. Thus, the minimum operating voltage of the receiver 6 can be secured. The load described above is described as a keyless entry receiver, but is not limited thereto and may be applied to other receivers and transmitters.

[0032]

As described above in detail, according to the present invention, it is possible to effectively utilize charge / discharge, reduce power consumption and control switching operation to eliminate the influence of load switching noise. it can. In addition, the supply voltage can be maintained by maintaining a necessary power supply voltage according to the number of switching pulses with respect to voltage fluctuation.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing waveforms of respective parts according to the first embodiment of the present invention.

FIG. 3 is a flowchart illustrating a microcomputer process according to the first embodiment of the present invention;

FIG. 4 is a diagram showing waveforms at various parts in a second embodiment of the present invention.

FIG. 5 is a flowchart illustrating a microcomputer process according to a second embodiment of the present invention;

FIG. 6 is a configuration diagram showing a third embodiment of the present invention.

FIG. 7 is a flowchart showing microcomputer processing according to a third embodiment of the present invention.

FIG. 8 is a diagram showing waveforms at various parts in a fourth embodiment of the present invention.

FIG. 9 is a flowchart illustrating a microcomputer process according to a fourth embodiment of the present invention.

FIG. 10 is a configuration diagram showing a fifth embodiment of the present invention.

FIG. 11 is a diagram showing waveforms at various points in a fifth embodiment of the present invention.

FIG. 12 is a flowchart illustrating a microcomputer process according to a fifth embodiment of the present invention;

FIG. 13 is a diagram showing waveforms at various portions in a sixth embodiment of the present invention.

FIG. 14 is a flowchart showing microcomputer processing according to a sixth embodiment of the present invention.

FIG. 15 shows a conventional power supply circuit.

[Explanation of symbols]

 1 ... Battery 3 ... Smoothing circuit 4 ... 5V regulator 5 ... Intermittent circuit 6 ... Receiver 7 ······ Microcomputer 8 ···· Reference voltage 9 ····· Comparator

Claims (8)

[Claims] A switching regulator connected to a power supply and a charging / discharging circuit for outputting a voltage having a predetermined waveform according to a switching operation of the switching means and a time constant of the charging / discharging circuit; In a power supply device comprising voltage conversion means for converting a voltage output from a regulator to a constant voltage, and applying an output voltage from the voltage conversion means to a load, an output voltage from the voltage conversion means is applied to the load. A power supply device for controlling the supply of power to the load, and further comprising control means for inhibiting the switching operation of the switch means when the output voltage from the voltage conversion means is applied to the load. 2. The control device according to claim 1, wherein the control unit applies an output voltage from the voltage conversion unit to a load, and inhibits a switching operation of the switch unit during a period when the load is to perform a stable operation. The power supply device according to claim 1. 3. The control means according to claim 1, wherein said control means detects an output voltage of said switching regulator and directly controls a switching operation of said switch means in accordance with the magnitude of said output voltage. Or the power supply device according to claim 2. 4. The control device according to claim 2, wherein, when a period during which the load is to perform a stable operation ends, the control device continuously turns on the switch device. Power supply. 5. The power supply device according to claim 1, further comprising timer means for performing a switching operation of said switch means and activating said control means. 6. The control means provides a pulse signal to the switch means to perform a switching operation, and the control means controls the number of the pulse signals according to the magnitude of the output voltage. A power supply device, characterized in that: 7. The load according to claim 1, wherein the load is a receiving unit that receives an external radio wave.
The power supply as described. 8. The load is receiving means for receiving an external radio wave, and the period in which the stable operation is to be performed is a period in which the receiving means performs a process of receiving an external radio wave. The power supply device according to claim 2 or 4, wherein